Innovative LED Solutions. AC/DC LED Lighting PRODUCT SELECTION GUIDE. June 2014

Transcription

1 ACT6 DESIG GUIDE Jun 0 Innovative LED Solutions AC/DC LED Lighting PRODUCT SELECTIO GUIDE LED Lighting Rev. Reference Apr 0 Designs June 0 Copyright 0 Active-Semi International, Inc

2 LED DESIG GUIDE Innovative Power TM Jun 0 Table of Contents ACT6 W 0mA(.V) E7.... ACT6 W 0mA(.V) E7 on-isolated ACT6 W 700mA(V) GU ACT6 W 700mA(V) GU0 on-isolated...9 ACT6 W 0mA(V) GU0... ACT6 W 0mA(V) GU0 on-isolated ACT6 7.W 0mA(6V) PAR ACT6 7.W 0mA(6V) PAR0 on-isolated ACT 6.W 700mA(V) PAR ACTA.-0VDC (up to.a) MR Copyright 0 Active-Semi International, Inc

3 ACT6 DESIG GUIDE Jun 0 E7 xw LED Lighting Input Voltage Device LED(s) Output Voltage Power Output Topology - 6VAC ACT6.V W Flyback Operation and Application Figure is the schematic of an offline LED driver using ACT6 to provide a power output of.v, 0mA. This circuit is a typical flyback type power supply which includes the AC rectified circuit (BD, C), power drive circuit (BD pin, Q), secondary rectified circuit (D, C) and the IC(ACT6) control circuit. ACT6 is a Primary Side Regulator (PSR) so that the power supply unit can regulate current and voltage without opto-coupler. Pin and Pin are the VDD and ground pins to provide power for the IC. Pin is the base driver for the P transistor. Pin is the switching pin. Pin is the feedback pin that senses the output current and output voltage. Pin 6 is the peak current sense pin. Through a patented PSR technology, this circuit can provide drivers for one (min), or two (max) LED lights in series due to the wide VDD operation ranges. Key Component Selection The turn ratio of the primary turn and the secondary turn ( P / S ), together with the R7 sets the maximum output current value as shown in formula (.). The voltage setting is through the flyback voltage of auxiliary winding and the feedback resistor R, R6 as shown in formula (.). P / S / AUX (60/0/) must be designed correctly to make sure it operates in DCM mode and it can supply either one to two LEDs in same circuit. A design value V OUTCV equal to.v and I -MI equal to 0mA are used to do the design. I L P RCS F V OUTCV (.) S and AUX are numbers of transformer secondary and auxiliary turns, and V SEC-R is the rectifier diode forward drop voltage at approximately 0.A bias. V OUTCV R S V ( ) V REF R6 SEC _R (.) AUX The peak current limit is set by ( ) /R CS. Figure : Schematic of LED Lighting Driver L FR 0Ω/W BD MB6S L.mH ote: The *R,*C,*D is optional C.7µF 00V *R 00kΩ D LL R Ω C.7µF V R 0MΩ *C 00pF *D GSM BD U VDD ACT6 SOT-6 FB R Ω CS 6 Q D00X TO-9 R7.Ω T EE0 R.kΩ R6 9.kΩ D SB0 R kω C 7µF/ 0V V+ Copyright 0 Active-Semi International, Inc

4 Output Current (ma) Efficiency (%) mm ACT6-00 ACT6-00 Innovative Power TM ACT6 DESIG GUIDE Jun 0 Bill of Materials REF. DESCRIPTIO MFTR. C Capacitor,Electrolytic,.7µF/00V, mm KSC PCB Top and Bottom Layers 6mm C Capacitor,Ceramic,00pF/00V,06,SMD POE C Capacitor,Ceramic,7µF/V,06,SMD POE C Capacitor,Ceramic,0µF/0V,06,SMD POE BD Bridge Rectifier,600V/0.A, MBS06, SDIP PAJIT D Diode,Utra Fast,GSM,000V/.0A,SMA PAJIT D General Rectifier, LL, 00V/A PAJIT D Diode,schottky,0V/A,S0,SMA PAJIT L Axial Inductor,.mH,00,Dip SoKa PCB PCB,L*W*T=..6mm,Rev:A Jintong FR Wire Round Resistor,W,0ohm,KP,% TY-OHM Q Transistor,HFE -,P,D00,TO-9 Huawai Electrical Specifications ITEM DESCRIPTIO CODITIO LIMITS Electrical Strength P Inductance P Leakage Inductance 0Hz, minute, from Primary and Secondary Inductance between pin and pin at VAC & khz Inductance between pin and pin with pins - and - shorted Typical performance Characteristics kvac.mh ± 7% 7µH R Chip Resistor, 00K ohm,00,% TY-OHM R Chip Resistor,0M ohm,06,% TY-OHM Efficiency vs. Input Voltage R, Chip Resistor, ohm,00,% TY-OHM 69.0 R Chip Resistor,.K ohm,00,% TY-OHM R6 Chip Resistor,9.K ohm,00,% TY-OHM R7 Chip Resistor,. ohm,06,% TY-OHM R Chip Resistor, K ohm, 00, % TY-OHM T Transformer, Lp=.mH, EE0 U IC, ACT6US-T, SOT-6 ACT Transformer Specification VAC 0VAC Input Voltage Pin Pin7 P S SH P Pin Pin Pin Pin P P SH Reverse S Output Current vs. Input Voltage Build Up WIDIG TERMIAL TURS START FIISH TYPE ote: P and P are Primary, S is Secondary (Bobbin: EE-0 Horizontal). WIRE SIZE QTY Core(SH) ISULATIO LAYER THICK/WIDE LAY ER P 60 UEW 0.Φ µ/.mm SH Open 6 UEW 0.Φ µ/.mm S 7 0 TEXE 0.Φ Reverse µ/.mm P UEW 0.Φ µ/.mm SH Core Copper Wire 0.Φ µ/.mm Input Voltage VI VAC VI VAC VI 0VAC VI 6VAC EVALUATIO KITS V I I 0 LED(s) ACT6-LED0-6VAC 00-0mA or Copyright 0 Active-Semi International, Inc

5 ACT6 DESIG GUIDE Jun 0 E7 xw LED Lighting on-isolated Input Voltage Device LED(s) Output Voltage Power Output Topology - 6VAC ACT6.V W buck Operation and Application Figure is the schematic of an offline LED driver using ACT6 to provide a power output of.v, 0mA. This circuit is tapped buck power supply which includes the AC rectified circuit (BD, C), power drive circuit (BD pin, Q), secondary rectified circuit (D, C) and the IC(ACT6) control circuit. ACT6 is a Primary Side Regulator (PSR) so that the power supply unit can regulate current and voltage without opto-coupler. Pin and Pin are the VDD and ground pins to provide power for the IC. Pin is the base driver for the P transistor. Pin is the switching pin. Pin is the feedback pin that senses the output current and output voltage. Pin 6 is the peak current sense pin. Through a patented PSR technology, this circuit can provide drivers for one (min), or two (max) LED lights in series due to the wide VDD operation ranges. Key Component Selection The turn ratio of the primary turn and the secondary turn ( P / S ), together with the R7 sets the maximum output current value as shown in formula (.). The voltage setting is through the flyback voltage of auxiliary winding and the feedback resistor R, R6 as shown in formula (.). P / AUX (60/) must be designed correctly to make sure it operates in DCM mode and it can supply either one to two LEDs in same circuit. A design value V OUTCV equal to.v and I -MI equal to 0mA are used to do the design. I L P RCS F V OUTCV (.) S and AUX are numbers of transformer secondary and auxiliary turns, and V SEC-R is the rectifier diode forward drop voltage at approximately 0.A bias. V OUTCV R S V ( ) V REF R6 SEC _R (.) AUX The peak current limit is set by ( ) /R CS. Figure : Schematic of LED Lighting Driver L FR 0Ω W BD MB6S L.mH ote: The *R,*C,*D is optional C.7µF 00V *R 00kΩ D LL R Ω R Ω C.7µF V VDD *C 00pF *D GSM R 0MΩ BD U ACT6 SOT-6 CS 6 R7.Ω Q D00X TO-9 FB D SB0 R.kΩ R6 9.kΩ R kω T EE0 C 7µF 0V V+ Copyright 0 Active-Semi International, Inc

6 mm Innovative Power TM ACT6 DESIG GUIDE Jun 0 Bill of Materials REF. DESCRIPTIO MFTR. C Capacitor,Electrolytic,.7µF/00V, mm KSC PCB Top and Bottom Layers 6mm C Capacitor,Ceramic,00pF/00V,06,SMD POE C Capacitor,Ceramic,7µF/V,06,SMD POE C Capacitor,Ceramic,0µF/0V,06,SMD POE BD Bridge Rectifier,600V/0.A, MBS06, SDIP PAJIT D Diode,Utra Fast,GSM,000V/.0A,SMA PAJIT D General Rectifier, LL, 00V/A PAJIT D Diode,schottky,0V/A,S0,SMA PAJIT L Axial Inductor,.mH,00,Dip SoKa PCB PCB,L*W*T=..6mm,Rev:A Jintong FR Wire Round Resistor,W,0ohm,KP,% TY-OHM Q Transistor,HFE -,P,D00,TO-9 Huawai R Chip Resistor, 00K ohm,00,% TY-OHM R Chip Resistor,0M ohm,06,% TY-OHM R, Chip Resistor, ohm,00,% TY-OHM R Chip Resistor,.K ohm,00,% TY-OHM R6 Chip Resistor,9.K ohm,00,% TY-OHM R7 Chip Resistor,. ohm,06,% TY-OHM R Chip Resistor, K ohm, 00, % TY-OHM T Transformer, Lp=.mH, EE0 U IC, ACT6US-T, SOT-6 ACT Electrical Specifications ITEM DESCRIPTIO Electrical Strength P+P Inductance P+P Leakage Inductance CODITIO 0Hz, minute, from Primary and Secondary Inductance between pin and pin at VAC & khz Inductance between pin and pin with pins -. Typical performance Characteristics Figure LIMITS kvac.mh ± 7% 7µH Transformer Specification Pin P SH P P (SH) Pin Pin Pin Pin P P SH P Build Up Core(SH) WIDIG TERMIAL TURS START FIISH TYPE WIRE SIZE QTY ISULATIO LAYER THICK/WIDE LAY ER Figure P 0 UEW 0.Φ µ/.mm P 0 UEW 0.Φ µ/.mm SH 6 UEW 0.Φ µ/.mm P UEW 0.Φ µ/.mm EVALUATIO KITS V I I 0 LED(s) SH Core Copper Wire 0.Φ µ/.mm ACT6-LED0-6VAC 00-0mA or ote: P,P,and P are Primary (Bobbin: EE-0 ;Vertical). Copyright 0 Active-Semi International, Inc

7 ACT6 DESIG GUIDE Jun 0 GU0 xw LED Lighting Input Voltage Device LED(s) Output Voltage Power Output Topology - 6VAC ACT6 V W Flyback Operation and Application Figure is the schematic of an offline LED driver using ACT6 to provide a power output of V, 60mA. This circuit is a typical flyback type power supply which includes the AC rectified circuit (BD, L, C), primary snubber circuit (D, R, C), power drive circuit (BD pin,q), secondary rectified circuit (D, C) and the IC control circuit. ACT6 is a Primary Side Regulator (PSR) so that the power supply unit can regulate current and voltage without Opto-couple. Pin and Pin are the VDD and ground pins to provide power for the IC. Pin is the base drive for the P transistor. Pin is the switching pin. Pin is the feedback pin that senses the output current and output voltage. Pin 6 is the peak current sense pin. Through a patented PSR technology, this circuit can provide drivers one W LED lights in series due to the wide VDD operation ranges. Key Component Selection The turn ratio of the primary turn and the secondary turn ( P / S ), together with the R7 sets the maximum output current value as shown in formula (.). The voltage setting is through the flyback voltage of auxiliary winding and the feedback resistor R, R6 as shown in formula (.). P / s / AUX (60/7/) must be designed correctly to make sure it operates in DCM mode and it can supply one LEDs in same circuit. A design value V OUTCV equal to V and I _MI equal to 60mA are used to do the design. I V OUTCV L P RCS F V R S V ( ) V REF R6 SEC _R (.) AUX OUTCV (.) S and AUX are numbers of transformer secondary and auxiliary turns, and V SEC-R is the rectifier diode forward drop voltage at approximately 0.A bias. The peak current limit is set by ( ) /R CS. Figure : Typical Application Circuit L FR 0/W BD MBS06 SMD L.mH 00 C.7µF/00V *R 00K/ 00 *C 0/00V 06 *D GSM SMA T EE0 D S0 SMD R K/00 C 7µF/0V V+ D LL R 0M/06 R R/00 R R/00 BD VDD U ACT6 SOT-6 Q D00X TO-9 FB R.6K/00 C.7µF/V 06 CS 6 R7 R/06 R6 9.K/00 Copyright 0 Active-Semi International, Inc

8 Output Current (ma) Efficiency (%) mm ACT6-00 ACT6-00 Innovative Power TM ACT6 DESIG GUIDE Jun 0 Bill of Materials REF. DESCRIPTIO MFTR. PCB Top and Bottom Layers 6mm C Capacitor,Electrolytic,.7µF/00V, mm KSC C Capacitor,Ceramic,00pF/00V,06,SMD POE C Capacitor,Ceramic,.7µF/V,06,SMD POE Transformer Specification Pin Pin7 C Capacitor,Ceramic,0µF/0V,06,SMD POE BD Bridge Rectifier,600V/0.A,MBS06,SDIP PAJIT D Diode,Utra Fast,GSM,000V/.0A,SMA PAJIT D General Rectifier,LL,00V/A PAJIT D Diode,schottky,0V/A,S0,SMA PAJIT L Axial Inductor,.mH,00,Dip SoKa PCB Build up PCB,L*W*T=..6mm,Rev:A Jintong FR Wire Round Resistor,W,0ohm,KP,% TY-OHM Q Transistor,HFE -,P,D00,TO-9 Huawai R Chip Resistor,00K ohm,00,% TY-OHM R Chip Resistor,0M ohm,06,% TY-OHM R, Chip Resistor, ohm,00,% TY-OHM R Chip Resistor,.6K ohm,00,% TY-OHM R6 Chip Resistor,9.K ohm,00,% TY-OHM R7 Chip Resistor, ohm,06,% TY-OHM R Chip Resistor,K ohm,00,% TY-OHM T Transformer,Lp=.mH,EE0 U IC,ACT6US-T,SOT-6 ACT WIDIG P S SH P TERMIAL TURS START FIISH TYPE WIRE SIZE QTY ISULATIO LAYER THICK/WIDE LAY ER P 60 UEW 0.Φ µ/.mm SH 6 UEW 0.Φ µ/.mm S 7 7 TEXE 0.Φ Reverse µ/.mm P UEW 0.Φ µ/.mm SH Core Pin Pin Pin Pin Copper Wire P P SH Core(SH) Reverse S 0.Φ µ/.mm 7 Electrical Specifications ITEM DESCRIPTIO CODITIO LIMITS Electrical Strength P Inductance P Leakage Inductance Typical Performance Characteristics LEDs Efficiency vs. Input Voltage Input Voltage Output Current vs. Input Voltage VOUT =.V 0Hz, minute, from Primary and Secondary Inductance between pin and pin at VAC & khz Inductance between pin and pin with pins - and 7- shorted Input Voltage VAC 0VAC VAC VAC 0VAC 6VAC kvac.mh ± 7% 7µH EVALUATIO KITS V I I 0 LED(s) ACT6-LED0-6VAC 60-70mA P and P are Primary, S is Secondary (Bobbin: EE-0 Vertical) Copyright 0 Active-Semi International, Inc

9 ACT6 DESIG GUIDE Jun 0 GU0 xw LED Lighting on-isolated Input Voltage Device LED(s) Output Voltage Power Output Topology - 6VAC ACT6 V W buck Operation and Application Figure is the schematic of an offline LED driver using ACT6 to provide a power output of V, 60mA. This circuit is tapped buck power supply which includes the AC rectified circuit (BD, L, C), primary snubber circuit (D, R, C), power drive circuit (BD pin,q), secondary rectified circuit (D, C) and the IC control circuit. ACT6 is a Primary Side Regulator (PSR) so that the power supply unit can regulate current and voltage without Opto-couple. Pin and Pin are the VDD and ground pins to provide power for the IC. Pin is the base drive for the P transistor. Pin is the switching pin. Pin is the feedback pin that senses the output current and output voltage. Pin 6 is the peak current sense pin. Through a patented PSR technology, this circuit can provide drivers one W LED lights in series due to the wide VDD operation ranges. Key Component Selection The turn ratio of the primary turn and the secondary turn ( P / S ), together with the R7 sets the maximum output current value as shown in formula (.). The voltage setting is through the flyback voltage of auxiliary winding and the feedback resistor R, R6 as shown in formula (.). P / AUX (60/) must be designed correctly to make sure it operates in DCM mode and it can supply one LEDs in same circuit. A design value V OUTCV equal to V and I _MI equal to 60mA are used to do the design. I V OUTCV L P RCS F V R S V ( ) V REF R6 SEC _R (.) AUX OUTCV (.) S and AUX are numbers of transformer secondary and auxiliary turns, and V SEC-R is the rectifier diode forward drop voltage at approximately 0.A bias. The peak current limit is set by ( ) /R CS. Figure : Typical Application Circuit FR 0Ω/W L BD MB6S L.mH C.7µF 00V *R 00kΩ *C 00pF *D GSM D SB0 R kω T EE0 C 7µF 0V V+ ote: The *R,*C,*D is optional D LL R Ω R Ω C.7µF V R 0MΩ VDD BD U ACT6 SOT-6 CS 6 Q D00X TO-9 FB R7 Ω R.6kΩ R6 9.kΩ Copyright 0 Active-Semi International, Inc

10 Output Current(mA) Efficiency mm Innovative Power TM ACT6 DESIG GUIDE Jun 0 Bill of Materials REF. DESCRIPTIO MFTR. PCB Top and Bottom Layers 6mm C Capacitor,Electrolytic,.7µF/00V, mm KSC C Capacitor,Ceramic,00pF/00V,06,SMD POE C Capacitor,Ceramic,.7µF/V,06,SMD POE C Capacitor,Ceramic,0µF/0V,06,SMD POE BD Bridge Rectifier,600V/0.A,MBS06,SDIP PAJIT D Diode,Utra Fast,GSM,000V/.0A,SMA PAJIT D General Rectifier,LL,00V/A PAJIT D Diode,schottky,0V/A,SB0,SMA PAJIT L Axial Inductor,.mH,00,Dip SoKa PCB PCB,L*W*T=..6mm,Rev:A Transformer Specification Build up Jintong FR Wire Round Resistor,W,0ohm,KP,% TY-OHM Q Transistor,HFE -,P,D00,TO-9 Huawai R Chip Resistor,00K ohm,00,% TY-OHM R Chip Resistor,0M ohm,06,% TY-OHM R, Chip Resistor, ohm,00,% TY-OHM Pin R Chip Resistor,.6K ohm,00,% TY-OHM R6 Chip Resistor,9.K ohm,00,% TY-OHM R7 Chip Resistor, ohm,06,% TY-OHM R Chip Resistor,K ohm,00,% TY-OHM T Transformer,Lp=.mH,EE0 U IC,ACT6US-T,SOT-6 ACT WIDIG TERMIAL P SH P P TURS START FIISH TYPE (SH) Pin Pin Pin Pin WIRE SIZE QTY P P SH P Core(SH) ISULATIO LAYER THICK/WIDE LAY ER Electrical Specifications ITEM DESCRIPTIO CODITIO LIMITS Electrical Strength P+P Inductance P+P Leakage Inductance 0Hz, minute, from Primary and Secondary Inductance between pin and pin at VAC & khz Inductance between pin and pin with pins - Typical Performance Characteristics 7.00% 76.00% 7.00% 7.00% 70.00% 6.00% 66.00% Average Efficiency Vs Vin Efficiency Vs Vin V,0" Vin Figure Output Current VS.Load Input Voltage Figure kvac.mh ± 7% 7µH P UEW 0.Φ µ/.mm P 7 UEW 0.Φ µ/.mm SH 6 UEW 0.Φ µ/.mm P UEW 0.Φ µ/.mm SH Core Copper Wire 0.Φ µ/.mm EVALUATIO KITS V I I 0 LED(s) ACT6-LED0-6VAC 60-70mA ote: P,P, and P are Primary (Bobbin: EE-0; Vertical). Copyright 0 Active-Semi International, Inc

11 GU0 xw LED Lighting ACT6 DESIG GUIDE Jun 0 Input Voltage Device LED(s) Output Voltage Power Output Topology - 6VAC ACT6 V W Flyback Operation and Application Figure is the schematic of an offline LED driver using ACT6 to provide a power output of V, 0mA. This circuit is a typical flyback type power supply which includes the AC rectified circuit (BD, C, L), primary snubber circuit (D, R, C), power drive circuit (BD pin, Q), secondary rectified circuit (D, C) and the IC control circuit. ACT6 is a Primary Side Regulator (PSR) so that the power supply unit can regulate current and voltage without Opto-coupler. Pin and Pin are the VDD and ground pins to provide power for the IC. Pin is the base drive for the P transistor. Pin is the switching pin. Pin is the feedback pin that senses the output current and output voltage. Pin 6 is the peak current sense pin. Through a patented PSR technology, this circuit can provide drivers for two (min), or three (max) LED lights in series due to the wide VDD operation ranges. Key Component Selection The turn ratio of the primary turn and the secondary turn ( P / S ), together with the R7 sets the maximum output current value as shown in formula (.). The voltage setting is through the flyback voltage of auxiliary winding and the feedback resistor R, R6 as shown in formula (.). P / S / AUX (60/0/) must be designed correctly to make sure it operates in DCM mode and it can supply either two or three LEDs in same circuit. A design value V OUTCV equal to V and I MI equal to 00mA are used to do the design F I L P (.) RCS VOUTCV S and AUX are numbers of transformer secondary and auxiliary turns, and V SEC R is the rectifier diode forward drop voltage at approximately 0.A bias. V OUTCV V REF ( The peak current limit is set by ( )/R CS. R ) R6 S AUX V SEC _R (.) Figure : Schematic of LED Lighting Driver L FR 0Ω/W BD MB6S C.µF 00V L.mH C.7µF 00V ote: The *R,*C,*D is optional *R 00kΩ D LL R Ω R Ω C.7µF V VDD *C 00pF *D GSM R 0MΩ BD U ACT6 SOT-6 CS 6 Q D00X TO-9 FB R7.Ω R.kΩ R6 9.kΩ T EE0 D SBB0 R 0kΩ C 0µF 6V V+ Copyright 0 Active-Semi International, Inc

12 Output Current (ma) Efficiency (%) mm ACT6-00 ACT6-00 Bill of Materials Innovative Power TM REF. DESCRIPTIO MFTR. ACT6 DESIG GUIDE Jun 0 PCB Top and Bottom Layers 6mm C Capacitor,Electrolytic,.7µF/00V, mm KSC C Capacitor,Ceramic,00pF/00V,06,SMD POE C Capacitor,Ceramic,.7µF/V,06,SMD POE C Capacitor,Ceramic,0µF/6V,06,SMD POE C Capacitor,Electrolytic,.µF/00V,6. mm KSC BD Bridge Rectifier,600V/0.A,MBS06,SDIP PAJIT D Diode,Utra Fast,GSM,000V/.0A,SMA PAJIT D General Rectifier, LL, 00V/A PAJIT D Diode,schottky,00V/A,S00,SMA PAJIT L Axial Inductor,.mH,00,Dip SoKa PCB PCB,L*W*T=..6mm,Rev:A Jintong FR Wire Round Resistor,W,0ohm,KP,% TY-OHM Electrical Specifications ITEM DESCRIPTIO CODITIO LIMITS Electrical Strength P Inductance P Leakage Inductance 0Hz, minute, from Primary and Secondary Inductance between pin and pin at VAC & khz Inductance between pin and pin with pins - and 7- shorted Typical Performance Characteristics Efficiency vs. Input Voltage kvac.mh ± 7% 7µH Q Transistor,HFE-,P,D00,TO-9 Huawai 76 R Chip Resistor,00K ohm,00,% TY-OHM R Chip Resistor,0M ohm,06,% TY-OHM 7 R, Chip Resistor, ohm,00,% TY-OHM R Chip Resistor,.K ohm,00,% TY-OHM 7 R6 Chip Resistor,9.K ohm,00,% TY-OHM R7 Chip Resistor,. ohm,06,% TY-OHM R Chip Resistor,0K ohm,00,% TY-OHM T Transformer,Lp=.mH,EE0 U IC, ACT6US-T, SOT-6 ACT Transformer Specification VAC 0VAC 0VAC VAC Input Voltage Pin Pin7 P S SH P Pin Pin Pin Pin P SH Reverse S Output Current vs. Load P 7 0 Build Up Core(SH) 0 0 WIDIG TERMIAL TURS START FIISH TYPE WIRE SIZE QTY ISULATIO LAYER THICK/WIDE LAY ER P 60 UEW 0.Φ µ/.mm SH Open 6 UEW 0.Φ µ/.mm S 7 0 TEXE 0.Φ Reverse µ/.mm P UEW 0.Φ µ/.mm SH Core Copper Wire 0.Φ µ/.mm ote: P and P are Primary, S is Secondary (Bobbin: EE-0 Vertical) VAC 6VAC 6VAC VAC 0VAC 0VAC VAC Input Voltage EVALUATIO KITS V I I 0 LED(s) ACT6-LED0-6VAC 0-0mA or Copyright 0 Active-Semi International, Inc

13 ACT6 DESIG GUIDE Jun 0 GU0 xw LED Lighting o-isolated Input Voltage Device LED(s) Output Voltage Power Output Topology - 6VAC ACT6 V W buck Operation and Application Figure is the schematic of an offline LED driver using ACT6 to provide a power output of V, 0mA. This circuit is tapped buck power supply which includes the AC rectified circuit (BD, C, L), primary snubber circuit (D, R, C), power drive circuit (BD pin, Q), secondary rectified circuit (D, C) and the IC control circuit. ACT6 is a Primary Side Regulator (PSR) so that the power supply unit can regulate current and voltage without Opto-coupler. Pin and Pin are the VDD and ground pins to provide power for the IC. Pin is the base drive for the P transistor. Pin is the switching pin. Pin is the feedback pin that senses the output current and output voltage. Pin 6 is the peak current sense pin. Through a patented PSR technology, this circuit can provide drivers for two (min), or three (max) LED lights in series due to the wide VDD operation ranges. Key Component Selection The turn ratio of the primary turn and the secondary turn ( P / AUX ), together with the R7 sets the maximum output current value as shown in formula (.). The voltage setting is through the flyback voltage of auxiliary winding and the feedback resistor R, R6 as shown in formula (.). P / AUX (60/) must be designed correctly to make sure it operates in DCM mode and it can supply either two or three LEDs in same circuit. A design value V OUT- CV equal to V and I MI equal to 00mA are used to do the design F I L P (.) RCS VOUTCV S and AUX are numbers of transformer secondary and auxiliary turns, and V SEC R is the rectifier diode forward drop voltage at approximately 0.A bias. V OUTCV AUX The peak current limit is set by ( )/R CS. R S V ( ) V REF R6 SEC _R (.) Figure : Schematic of LED Lighting Driver L FR 0Ω/W BD MB6S C.µF 00V L.mH C.7µF 00V ote: The *R,*C,*D is optional *R 00kΩ D LL R Ω R Ω C.7µF V R 0MΩ VDD *C 00pF *D GSM BD U ACT6 SOT-6 CS 6 Q D00X TO-9 FB R7.Ω D SBB0 R.kΩ R6 9.kΩ R 0kΩ T EE0 C 0µF 6V V+ Copyright 0 Active-Semi International, Inc

14 Output Current(mA) Efficiency mm Bill of Materials Innovative Power TM REF. DESCRIPTIO MFTR. ACT6 DESIG GUIDE Jun 0 PCB Top and Bottom Layers 6mm C Capacitor,Electrolytic,.7µF/00V, mm KSC C Capacitor,Ceramic,00pF/00V,06,SMD POE C Capacitor,Ceramic,.7µF/V,06,SMD POE C Capacitor,Ceramic,0µF/6V,06,SMD POE C Capacitor,Electrolytic,.µF/00V,6. mm KSC BD Bridge Rectifier,600V/0.A,MBS06,SDIP PAJIT D Diode,Utra Fast,GSM,000V/.0A,SMA PAJIT D General Rectifier, LL, 00V/A PAJIT D Diode,schottky,00V/A,SBB0,SMA PAJIT L Axial Inductor,.mH,00,Dip SoKa PCB PCB,L*W*T=..6mm,Rev:A Transformer Specification Build Up Jintong FR Wire Round Resistor,W,0ohm,KP,% TY-OHM Q Transistor,HFE-,P,D00,TO-9 Huawai R Chip Resistor,00K ohm,00,% TY-OHM R Chip Resistor,0M ohm,06,% TY-OHM R, Chip Resistor, ohm,00,% TY-OHM Pin R Chip Resistor,.K ohm,00,% TY-OHM R6 Chip Resistor,9.K ohm,00,% TY-OHM R7 Chip Resistor,. ohm,06,% TY-OHM R Chip Resistor,0K ohm,00,% TY-OHM T Transformer,Lp=.mH,EE0 U IC, ACT6US-T, SOT-6 ACT WIDIG TERMIAL P SH P P TURS START FIISH TYPE WIRE SIZE QTY ISULATIO LAYER THICK/WIDE LAY ER P 0 UEW 0.Φ µ/.mm P 0 UEW 0.Φ µ/.mm SH 6 UEW 0.Φ µ/.mm P UEW 0.Φ µ/.mm SH Core Copper Wire (SH) Pin Pin Pin Pin 0.Φ µ/.mm P P SH P Core(SH) Electrical Specifications ITEM DESCRIPTIO CODITIO LIMITS Electrical Strength P+P Inductance P+P Leakage Inductance 0Hz, minute, from Primary and Secondary Inductance between pin and pin at VAC & khz Inductance between pin and pin with pins -. shorted Typical Performance Characteristics 6.00%.00%.00% 0.00% 7.00% 76.00% 7.00% 7.00% 70.00% Average Efficiency Vs Vin Efficiency Vs Vin V,0" Vin Figure Output Current VS.Load Input Voltage Figure kvac.mh ± 7% 7µH EVALUATIO KITS V I I 0 LED(s) ACT6-LED06-6VAC 0-0mA or ote: P and P and P are Primary (Bobbin: EE-0 ;Vertical). Copyright 0 Active-Semi International, Inc

15 ACT6 DESIG GUIDE Jun 0 PAR0 7xW LED Lighting Input Voltage Device LED(s) Output Voltage Power Output Transformer Topology - 6VAC ACT6 7 6V 7.W EE6 Flyback Operation and Application Figure is the schematic of LED lighting using ACT6 to provide output power of 6V00mA with PF>0.77.This circuit is a typical flyback power supply which includes the AC rectified circuit(bd,c, C),power drive circuit (BD pin, Q),power factor rectified circuit (D- D,C,C),secondary rectified circuit (D6, C7,C) and the IC control circuit. ACT6 is a Primary Side Regulator (PSR) so that the power supply unit can regulate current and voltage without Opto-coupler. Pin and Pin are the VDD and ground pins to provide power for the IC. Pin is the base drive for the P transistor. Pin is the switching pin. Pin is the feedback pin that senses the output current and output voltage. Pin 6 is the peak current sense pin. Resistance of R0 determines the output DC cord compensation percentage. Through a patented PSR technology, this circuit can provide drivers for five(min), or seven (max) LED lights in series due to the wide VDD operation ranges. Key Component Selection The maximum output current is decided by formula (). I 0.9* 0.96 F LP ( ) ( ) R V CS Lp is the transformer inductance value, Rcs is the current sense resistor, which is shown as R9 in the schematic. Fsw is the switching frequency, which design value is 7kHz. η is the overall system efficiency, which value is approximately equal to 7%. Voutcc is the output voltage, which setting is through the flyback voltage of auxiliary winding and the feedback resistor R, R6 as shown in formula (). V V REF R S ( ) R 6 AUX V SEC _ R p/s/aux (0//) must be designed correctly to ensure it operates in DCM in all conditions. A design value Voutcc equal to 6V and Ioutcc_min equal to 00mA are used to do the design. s and aux are number of turns of secondary and auxiliary of the transformer. VSEC_R is the forward voltage drop of the output rectifier diode at approximately 0.A bias. The peak current limit is set by ( )/Rcs. () () Figure : Schematic of LED Lighting Driver F A 0V R k T EE6 R C6 L C- 0.µF L.mH L 60µH C- 0.µF DB B6S C µf/00v D 007 D 007 D 007 C uf/00v R 00kΩ D FR0 C 000pF/ KV R7 MΩ R MΩ D FR07 Q 00 0Ω 000pF 0 D6 HER0 9 C7 7µF/0V R 0kΩ C9 0/00VAC C 7µF/0V V+ LED LED7 R Ω 6 U VDD ACT6 FB R Ω CS C 0µF/ V R0 0kΩ BD,,7 R9 0.67Ω R.kΩ R6.66kΩ Copyright 0 Active-Semi International, Inc

16 ACT6 DESIG GUIDE Jun 0 Bill of Materials REF DESCRIPTIO MFTR C-/ X Capacitor,0.µF/00V,x6xmm C,C Capacitor,Electrolytic, µf/0v, 0xmm USE KSC C Capacitor,Ceramic,000pF/KV, DIP POE C Capacitor,Electrolytic,0µF/V, xmm KSC C6 Capacitor,Ceramic,000pF/0V,06 POE Io(mA) C7,C Capacitor,Electrolytic, 7µF/0V, 6.xmm KSC C9 Y cap,000pf/7v,dip USE BD Bridge,B6S,600V/0.A,MDI,SMD PAJIT D~D Fast Recovery Rectifiers,007, DO- Good-Ark D Fast Recovery Rectifier,FR07,DO- Good-Ark D Fast Recovery Rectifier,FR0,DO- Good-Ark D6 Efficiency Rectifiers, 00V/A,HER0, DO- Good-Ark L Axial Inductor,.mH, x7mm,dip SoKa L I-shaped Inductor,60µH,00,Dip SoKa Q Transistor, HFE 0- P, D00, TO-6 Huawei PCB PCB, ACT6_LED_0,Rev:A Jintong F Fuse:.A 0V.6*0mm With Pigtail walter R,R Chip Resistor, Ω, 00, % TY-OHM R Chip Resistor, 00kΩ, W, % TY-OHM R Chip Resistor,.kΩ, 00,% TY-OHM R6 Chip Resistor,.66kΩ, 00, % TY-OHM R7,R Chip Resistor, MΩ, 00, % TY-OHM R9 Chip Resistor, 0.67Ω, 06,% TY-OHM R0 Chip Resistor, 0kΩ, /W, % TY-OHM R Chip Resistor, 0Ω, 00, % TY-OHM R Chip Resistor,.0kΩ, 00, % TY-OHM R Chip Resistor, 0kΩ, 00, % TY-OHM T U Transformer, Lp=.0mH, EE6, Vertical IC, ACT6SH-T,SOP- Transformer Specifica- Pin Pin Pin Core P S SH P SH 0 P P SH SH Reverse S 0 Electrical Specifications ITEM DESCRIPTIO CODITIO LIMITS Electrical Strength P Inductance P Leakage Inductance PCB Layout 0Hz, minute, from Primary and Secondary Inductance between pin and pin at VAC & khz Inductance between pins and pin with pins - and -0 shorted Typical performance Characteristics EFFICIEY CV Regulation Input voltage(v) LIE AD LOAD REGULATIO kvac.0mh ± 7% 7µH Build up Core SH WIDIG TERMIAL TURS START FIISH TYPE WIRE SIZE QTY LAYER ISULATIO THICK/WIDE LAYE R PFC TEST SH UEW 0.Φ* 0.0*.W P 0 UEW 0.Φ* 0.0*.W SH UEW Reverse 0.Φ* 0.0*.W S 0 TEX-E 0.Φ* 0.0*.W P UEW 0.Φ* 0.0*.W SH core conductor 0.Φ* 0.0*0 ote: SH,SH,and SH are shielding; P and P are Primary, S is Secondary (Bobbin: EE-6, Vertical). EVALUATIO KITS HARMOIC CURRET V I V O Io ACT6-LED0-6VAC 6V 00-00mA Copyright 0 Active-Semi International, Inc

17 ACT6 DESIG GUIDE Jun 0 PAR0 7xW LED Lighting on-isolated Input Voltage Device LED(s) Output Voltage Power Output Transformer Topology - 6VAC ACT6 7 6V 7.W EE6 Flyback Operation and Application Figure is the schematic of LED lighting using ACT6 to provide output power of 6V00mA with PF>0.77.This circuit is a typical flyback power supply which includes the AC rectified circuit(bd,c, C),power drive circuit (BD pin, Q),power factor rectified circuit (D- D,C,C),secondary rectified circuit (D6, C7,C) and the IC control circuit. ACT6 is a Primary Side Regulator (PSR) so that the power supply unit can regulate current and voltage without Opto-coupler. Pin and Pin are the VDD and ground pins to provide power for the IC. Pin is the base drive for the P transistor. Pin is the switching pin. Pin is the feedback pin that senses the output current and output voltage. Pin 6 is the peak current sense pin. Resistance of R0 determines the output DC cord compensation percentage. Through a patented PSR technology, this circuit can provide drivers for five(min), or seven (max) LED lights in series due to the wide VDD operation ranges. Key Component Selection The maximum output current is decided by formula (). I 0.9* 0.96 F LP ( ) ( ) R V CS Lp is the transformer inductance value, Rcs is the current sense resistor, which is shown as R9 in the schematic. Fsw is the switching frequency, which design value is 7kHz. η is the overall system efficiency, which value is approximately equal to 7%. Voutcc is the output voltage, which setting is through the flyback voltage of auxiliary winding and the feedback resistor R, R6 as shown in formula (). V V REF R S ( ) R 6 AUX V SEC _ R p/s/aux (0//) must be designed correctly to ensure it operates in DCM in all conditions. A design value Voutcc equal to 6V and Ioutcc_min equal to 00mA are used to do the design. s and aux are number of turns of secondary and auxiliary of the transformer. VSEC_R is the forward voltage drop of the output rectifier diode at approximately 0.A bias. The peak current limit is set by ( )/Rcs. () () Figure : Schematic of LED Lighting Driver L F A 0V C- 0.µF R k L.mH L 60µH C- 0.µF DB B6S C µf/00v D 007 D 007 D 007 C uf/00v R 00kΩ D FR0 C 000pF/ kv R7 MΩ R MΩ D FR07 Q 00 D6 SBB0 T EE6 C7 7µF 0V R 0kΩ C 7µF 0V V+ LED LED7 R Ω C 0µF/ V R0 0kΩ R R BD 6 VDD U ACT6 CS,,7 FB R9 0.67Ω R.kΩ R6.66kΩ Copyright 0 Active-Semi International, Inc

18 Bill of Materials REF DESCRIPTIO MFTR C-/ X Capacitor,0.µF/00V,x6xmm C,C Capacitor,Electrolytic, µf/0v, 0xmm USE KSC C Capacitor,Ceramic,000pF/KV, DIP POE C Capacitor,Electrolytic,0µF/V, xmm KSC C6 Capacitor,Ceramic,000pF/0V,06 POE C7,C Capacitor,Electrolytic, 7µF/0V, 6.xmm KSC C9 Y cap,000pf/7v,dip USE BD Bridge,B6S,600V/0.A,MDI,SMD PAJIT D~D Fast Recovery Rectifiers,007, DO- Good-Ark D Fast Recovery Rectifier,FR07,DO- Good-Ark D Fast Recovery Rectifier,FR0,DO- Good-Ark D6 Efficiency Rectifiers, 00V/A,HER0, DO- Good-Ark L Axial Inductor,.mH, x7mm,dip SoKa L I-shaped Inductor,60µH,00,Dip SoKa Q Transistor, HFE 0- P, D00, TO-6 Huawei PCB PCB, ACT6_LED_0,Rev:A Jintong F Fuse:.A 0V.6*0mm With Pigtail walter R,R Chip Resistor, Ω, 00, % TY-OHM R Chip Resistor, 00kΩ, W, % TY-OHM R Chip Resistor,.kΩ, 00,% TY-OHM R6 Chip Resistor,.66kΩ, 00, % TY-OHM R7,R Chip Resistor, MΩ, 00, % TY-OHM R9 Chip Resistor, 0.67Ω, 06,% TY-OHM R0 Chip Resistor, 0kΩ, /W, % TY-OHM R Chip Resistor, 0Ω, 00, % TY-OHM R Chip Resistor,.0kΩ, 00, % TY-OHM R Chip Resistor, 0kΩ, 00, % TY-OHM ACT6 DESIG GUIDE Jun 0 Electrical Specifications ITEM DESCRIPTIO CODITIO LIMITS Electrical Strength P+P Inductance P+P Leakage Inductance PCB Layout 0Hz, minute, from Primary and Secondary Inductance between pin and pin at VAC & khz Inductance between pins and pin with pins - shorted Typical performance Characteristics EFFICIEY kvac.0mh ± 7% 7µH T Transformer, Lp=.0mH, EE6, Vertical U IC, ACT6SH-T,SOP- Transformer Specification Pin Pin Pin Core P SH P P SH P P P SH SH LIE AD LOAD REGULATIO Build up Core SH TERMIAL WIRE ISULATIO PFC TEST WIDIG TURS START FIISH TYPE SIZE QTY LAYER THICK/WIDE LAYE R SH UEW 0.Φ* 0.0*.W P 0 UEW 0.Φ* 0.0*.W P UEW 0.Φ* 0.0*.W SH UEW 0.Φ* 0.0*.W S 0 UEW 0.Φ* 0.0*.W P UEW 0.Φ* 0.0*.W SH core conductor 0.Φ* 0.0*0 ote: SH,SH,and SH are shielding; P,P and P are Primary, (Bobbin: EE-6, Vertical). EVALUATIO KITS HARMOIC CURRET V I V O Io ACT6-LED0-6VAC 6V 00-00mA Copyright 0 Active-Semi International, Inc

19 ACT DESIG GUIDE Jun 0 PAR 7xW LED Lighting Input Voltage Device LED(s) Output Voltage Power Output Transformer Topology - 6VAC ACT 7 V 6.W EF0 Flyback Key Component Selection The maximum output current is decided by formula (). Operation and Application Figure is the schematic of LED lighting using ACT to provide output power of V700mA with PF>0.9.This circuit is a typical flyback power supply which includes the AC rectified circuit(d- D,CA, C),power drive circuit (GATE pin, Q),power factor rectified circuit (D9- D,CA,C),secondary rectified circuit (D, C9,C0) and the IC control circuit. ACT is a CCM & Quasi-Resonant PWM Controller. Pin and Pin are the VDD and ground pins to provide power for the IC. Pin is the gate drive pin for the MOSFET. Pin is the Current Sense Pin. Pin is the Valley Detector Pin. Pin 6 is the Feedback Pin. I outcc Its output voltage or number of LED is roughly decided by formula (). V outcv R6. R R // R R R0 R. * * Io * R // R R0 R0 The transformer design procedure can refer to the design example section of ACT DS. In this design, p/s/aux is set as 0/6/ to ensure it operates in CCM to improve efficiency. Independent Output Short Protection, OTP, OVP, Brown Out Protection, Rcs Short/Open Protection, Transformer Winding Short Protection, Output Diode Short/Open Protection, Open Loop Protection, are integrated to protect damage on circuits and LED die itself. () () This circuit can provide drivers for five (min), or seven (max) LED lights in series due to the wide VDD operation ranges. Accurate current control is through R/R and LM control circuit. Figure : Schematic of LED Lighting Driver D-D L UU9. 0mH TVS 07 TC RSC CA µf 0V L D9 D CX 0.uF 00V F A 0Vac D0 C µf 0V R6.Ω R C 0kΩ000pF D RSM R 00Ω Q 6 R9 0Ω GATE U CS ACTUS-T VDET SOT-6 D7 L UB VDD FB 6 R MΩ R MΩ R0 Ω C 6.µF V C7 00pF 0V Bead T.*9 D6 RSM R.7Ω R7.9kΩ R.kΩ R.kΩ R 0Ω D SB000 R7 KΩ CY 00pF 00Vac C 000pF/00V R0 0kΩ L uh C9 70µF V UA R.7kΩ D9 R 0kΩ C 0.µF 0V C0 70µF V R 0.Ω R 0.Ω R kω R 0kΩ VCC OUT 7 OUT I- 6 I- I+ R9 kω C 0.µF I+ U LM LF 00µH U TLA R 0Ω R KΩ R6 70Ω V+ Copyright 0 Active-Semi International, Inc

20 Bill of Materials REF DESCRIPTIO MFTR IC IC, ACT, SOT-6 Active-Semi CA Capacitor, Electrolytic, µf/0v, 0 6mm KSC C Capacitor, Electrolytic,µF/0V, 0 6mm KSC C Capacitor, Ceramic,000pF/0.KV,SMD POE C Capacitor, Electrolytic,6.µF/V,*mm KSC C7 Capacitor, Ceramic, 000PF/0V,00,SMD POE C Capacitor, Ceramic, 000PF/00V,00,SMD POE C9,C0 Capacitor, Electrolytic,70µF/V,*6mm POE C,C Capacitor, Ceramic,0.uF/0V,00,SMD POE D-D,D9-D Diode, 007,A000V DO- Good-Ark D,D6 RSM SMD Good-Ark D7 Diode L SMD Good-Ark D Diode, Schottky, 00V/0A, SBR000, DO-0 Good-Ark LF CM Inductor, 0mH, UU9. SoKa LF Axial Inductor, 0.*T, *7,Dip 00uH SoKa L DM Inductor, µh, R SoKa Q Mosfet Transisor, 06, TO-0 ST PCB PCB, L*W*T =9x6x.6mm, Cem-, Rev:A Jintong F Fusible, A/0V TY-OHM R,R Chip Resistor,M, SMD 00, % TY-OHM R metal Resistor,00K Ω,06,% TY-OHM R Chip Resistor, 00Ω, 00, % TY-OHM R Chip Resistor,.7Ω, 00, % TY-OHM R6 Chip Resistor,Ω,06, % TY-OHM R7 Chip Resistor, 7KΩ, 00, % TY-OHM R Chip Resistor,.7KΩ, 00, % TY-OHM R9 Chip Resistor, 0Ω,00, % TY-OHM R0 Chip Resistor, Ω,00, % TY-OHM R Chip Resistor, 6KΩ,00, % TY-OHM R,R Chip Resistor, 0.Ω, 06, % TY-OHM R Chip Resistor, KΩ, 00, % TY-OHM R Chip Resistor,KΩ, 00,% TY-OHM R6 Chip Resistor,0Ω, 00,% TY-OHM R7 Chip Resistor,KΩ, 00, % TY-OHM R,R Chip Resistor,0KΩ, 00, % TY-OHM R9 Chip Resistor,KΩ, 00, % TY-OHM R0 Chip Resistor,0KΩ, 00,% TY-OHM R Chip Resistor,6KΩ, 00,% TY-OHM R Chip Resistor,0Ω, 00,% TY-OHM R Chip Resistor,Ω, 06,% TY-OHM T EF0 ACT CX X capacitance, 0.µF/00V,X TC Thermistor, SC0 TVS Varistor, 7D7 CY Y capacitance, 000pF/00V,Y SEC IC Opto-coupler, PC7C CTR=00 dip- Sharp IC IC LM SOP- ST IC Voltage Regulator, TLA, Vref=.V TO-9 ST ACT DESIG GUIDE Jun 0 Electrical Specifications ITEM DESCRIPTIO CODITIO LIMITS Electrical Strength P Inductance P Leakage Inductance PCB Layout 0Hz, minute, from Primary and Secondary Inductance between pin and pin at VAC & khz Inductance between pins and pin with pins - shorted Typical performance Characteristics EFFICIEY LIE AD LOAD REGULATIO kvac 0.mH ± 7% 7µH Transformer Specification P 0 P P S SH P 9 0 P P SH S 9 Build up PFC TEST TERMIAL WIRE ISULATIO WIDIG TURS START FIISH TYPE SIZE QTY LAYER THICK/WIDE LAYE R P 0 UEW 0.Φ* 0.0*W SH 0.9 copper 0mm 0.0*W S TEX-E 0.Φ* 0.0*W P UEW 0.Φ* 0.0*W P 0 UEW 0.Φ* 0.0*W SH core conductor 0.Φ* 0.0*0 ote: SH,SHare shielding; P,P and P are Primary, (Bobbin: EF-0, level). EVALUATIO KITS HARMOIC CURRET V I V O Io ACT-LED0-6VAC V mA Copyright 0 Active-Semi International, Inc

21 ACTA High Efficiency, Low Cost HB LED Lighting Input Voltage LED # Output Current V FB Topology. 0VDC -6.A 00mV Buck Circuit Bottom View Circuit Top View Key Component Selection Design Features 9% Efficiency.V to 0V Input and up to.a Output. MHz Switching & Small SOT-6 Package PWM (0-00%, 0.-0kHz) Dimming Thermal Shutdown & Short Circuit Protection Operation and Application The bridge rectifier is for AC input only. The DC input is directly connected to I and ground. The ACTA has an under-voltage lockout (UVLO) at.0v with 0mV hysteresis. When input voltage falls below.0v, stops switching. The device is activated as input voltage goes higher than.v. The LED output current is sensed by a resistor in series with the LED. The ACTA precisely regulates the LED current by the internal EA and 0.V reference. The average LED current is determined by the equation: I LED =0.V/ R SESE. The ACTA allows dimming with a PWM signal at the DIM pin. A signal level above.v enables switching and turns LED on. To turn off the LED current, the signal level has to be below.v. The dimming signal frequency range is from 00Hz to 0kHz.A 00kΩ resistor is needed to connect between FB pin R SESE. A 00pF capacitor is recommended to connect from the FB pin to ground. An inductor with RMS rating greater than load current and its saturation current at least 0% higher should be used. Inductance value is selected to make its ripple current 0-0% of the load current. A Schottky diode (D) is usually used for better efficiency as long as the breakdown voltage can withstand the maximum output voltage. The forward current rating of the diode must be at least equal to the maximum LED current. For AC input, if a conventional step-down line transformer is used, a low cost I00can be used for D-D. However, if a high frequency electronic transformer is used, a Schottky diode such as SS should be used for high efficiency operation. For input and output capacitors, small size and low ESR ceramic capacitor is preferred. PC Board Layout Guidance Place input capacitor (C) to I pin, inductor (L) and diode (D) to pin as close as possible to reduce the voltage ringing at these pins. Place the current sense resistor (R ) close to FB pin. Minimize ground noise by connecting high current ground returns, the input capacitor ground lead, and the output filter ground lead to a single point (star ground configuration). There are two power loops in normal operation, one is formed when the is high and the high current flows through input capacitor (C), internal MOSFET, inductor(l), LEDs, R SESE (R) to ground. The other loop is through inductor (L), LEDs, R SESE (R), ground to diode(d). Make these loop areas as small as possible to minimize noise interaction. Copyright 0 Active-Semi International, Inc

22 ACTA High Efficiency, Low Cost HB LED Lighting Schematic ( VI=VDC or AC, x0ma LEDs ) Bill of Materials PCB Top Layer Ref. Description Mftr C Capacitor Tantalum,00uF/6V, D Case AVX C Capacitor, Ceramic,0.0uF/0V,060 POE C Capacitor, Ceramic,00pF/V,060 POE C Capacitor Ceramic,0uF/6V,06 AVX D-D Diode shottoky, 0V/A, SS, SMA PAJIT D Schottky Barrier Rectifier,SR,0V/.0A,SMB PAJIT Typical performance characteristics ZD Diode Zener,GLZA,V, 0.W, MII-MELF PAJIT R Meter Film Resistor, 0KΩ,060, % TY-OHM R Meter Film Resistor, 0.Ω,06, % TY-OHM R Meter Film Resistor, 0Ω,06, % TY-OHM L SMD Power Inductor,SR0600ML,0uH,±0% QianRu U IC,ACT,SOT-6 Active PCB Bottom Layer Copyright 0 Active-Semi International, Inc