CM6901T2 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs

Transcription

1 CM690T SLS (SRC/LLCSR) Controller with FM PWMs GENERAL DESCRIPTION FEATURES CM690T is a SLS, SRC/LLC SR resonant controller and it can operate at both SRC and LLC region with synchronous rectification to achieve high efficiency. Its unique features: FM PWMING modes. It is used for DC-DC conversion in offline application. Light load regulation is accomplished by transitioning the controller from frequency modulation mode into PWM mode. We call this is Light load PWMING function. When ac turn off, bulk input voltage will drop. The switching frequency is below the highest resonant point frequency fr= / π LrCr ;Lr: resonant choke; Cr: resonant cap. SR Ideal Diode PWMING for synchronous drivers is accomplished by comparing the voltage signal at the RSET pin to RTCT ramp. The pulse-width reduction will happen when switching frequency below the highest resonant point frequency fr. The CM690T have FM PWMING modes to have the optimal balance performance between hold-up time and efficiency. The operate region shown as fig. CM690T system has a constant voltage feedback loop with precision.5v VFB reference. The V ILIMIT can be latched when a standby converter is applied; otherwise, it is an auto-restart I limit. 60 fr 90 Controller Smaller and Thinner Transformer 0ms with reasonable Bulk Cap(hold up time) SLS, SRC/LLC SR resonant controller Rising Edge Delay Time ~ 50nS for LR between 00uH to 00uH Gate Drivers: Typical Peak Drive from V supply : (PMOS~00 ohm and NMOS~00 ohm). UVLO =V with V Hysteresis. Reference OK Comparator. FM PWMING Mode Operation Light Load PWMING (light load regulation) SR Ideal Diode PWMING(cross resonant frequency application ) GM FEAO, FM modulation Error Amplifier GM DEAO, PWM Error Amplifier Soft start Capability with Shutdown Function. Auto-Restart during Current LIMIT. Precision.5V VFB threshold for constant voltage feedback loop. Precision V I limit threshold (ILIM). Patented Vo SR ideal Diode PWM Region Region FM Modulation Light load Pwming Region Fsw x 0 5 Fig FM PWMING mode 05/0/6 Rev. Champion Microelectronic Corporation Page

2 CM690T SLS (SRC/LLCSR) Controller with FM PWMs APPLICATIONS CM690T Pin Configuration DC-DC Power Supply. ORDERING INFORMATION Part Number Temperature Range Package CM690TXIS* -0 to 5 6-Pin SOP (S6) CM690TXISTR* -0 to 5 6-Pin SOP (S6) CM690TXIP* -0 to 5 6-Pin PDIP (P6) * X : Suffix for Halogen Free and PB Free Product TR : Package is Taping & Reel THERMAL DATA PARAMETER Min MAX Unit Case Temperature (θ JC ) Plastic PDIP Plastic SOP.8.5 /W 05/0/6 Rev. Champion Microelectronic Corporation Page

3 CM690T SLS (SRC/LLCSR) Controller with FM PWMs BLOCK DIAGRAM FM modulation compensation Light Load PWMING Light load pwming reduce Mosfet duty cycle SR Ideal Diode PWMING (Synchronous Outputs): Reduce SR MOSFET duty cycle Output voltage feed 7.5V Vref Operation frequency Light load set up pwming compensation Primary driver Soft start Operation frequency set up Secondary driver Over power protect 05/0/6 Rev. Champion Microelectronic Corporation Page

4 CM690T SLS (SRC/LLCSR) Controller with FM PWMs PIN DESCRIPTION Pin No. Symbol Description External resistor which convert FEAO voltage signal into current RSET signal (V to I) for frequency modulation. SR is PWMING Control, when RSET lower than.5v. Operating Voltage Min. Typ. Max. Unit V VFB Non-inverting input into resonant error amplifier. 0.5 V FEAO Resonant error amplifier output and compensation node for frequency modulation control. D_IN- Inverting input into Light load PWMING error mode amplifier V 0 6 V 5 D_IN Non-inverting input into Light load PWMING mode error amplifier. 0 6 V 6 DEAO 7 CSS PWM error amplifier output and compensation node for Light load PWMING control Soft start for FM/PWM operation with V enable threshold. Also, use for auto-restart operation during current limit. 0.5 V 0 5.5VBE V 8 ILIM Sense Input to current comparator with V threshold. 0.5 V 9 RTCT Oscillator timing components which set the minimum frequency.. V 0 GND Ground SDRVB Synchronous MOSFET driver output. -0. VCC V SDRV Synchronous MOSFET driver output. -0. VCC V PRIDRVB Primary side MOSFET driver output. -0. VCC V PRIDRV Primary side MOSFET driver output. -0. VCC V 5 VCC Positive supply for the IC V 6 VREF Buffered output for the 7.5V voltage reference 7.5 V 05/0/6 Rev. Champion Microelectronic Corporation Page

5 ABSOULTE MAXIMUM RATINGS CM690T SLS (SRC/LLCSR) Controller with FM PWMs (TA=5, unless otherwise specified.) The following ratings designate persistent limits beyond which damage to the device may occur. Symbol Parameter Value Unit VCC DC Supply Voltage V SRDRV SRDRV Voltage GND-0. to VCC0. V SRDRVB SRDRVB Voltage GND-0. to VCC0. V PRIDRV PRIDRV Voltage GND-0. to VCC0. V PRIDRVB PRIDRVB Voltage GND-0. to VCC0. V Driver (Pin~Pin) Driver Voltage (period less than 50ns) GND-.0 to VCC0. V Driver Voltage (period less than 5ns) GND-5.0 to VCC0. V Driver Out Sink or Source 0. A Driver Out Sink or Source (period less than 5us) 0.5 A VREF VREF Voltage GND-0. to 8 V VREF VREF Transient Voltage (period less than ms) 8.5 V VREF VREF Transient Voltage (period less than 00us) 0 V IREF VREF Current 5 ma RTCT RTCT Voltage -0. to VREF0. V VILIM VILIM Voltage -0. to VREF0. V CSS CSS Voltage -0. to VREF0. V DEAO PWM Error Amplifier Output Voltage -0. to VREF0. V D_IN Non-Inverting Input Into PWM Error Amplifier Voltage -0. to VREF0. V FEAO Resonant Error Amplifier Output Voltage -0. to VREF0. V VFB Non-Inverting Input Into Resonant Error Amplifier Voltage -0. to VREF0. V RSET V to I Voltage -0. to VREF0. V IC Test Equivalent External Circuit 5K CM690 Rset VREF 6 0.K 50K FEAO VCC PRIDRV 5 0.K M 5 D_IN- D_IN PRIDRVB SRDRV SRDRVB RTCT fsw = 70PF 6 DEAO RT/CT 9 05/0/6 Rev. Champion Microelectronic Corporation Page 5

6 CM690T SLS (SRC/LLCSR) Controller with FM PWMs ELECTRICAL CHARACTERISTICS (VCC=V, RT=0.K±%, CT=70PF±%, Freq. = 50 KHz, Duty Cycle=8%, Temp= -0 ~ 5, unless otherwise specified.) Parameter Symbol Conditions Min. Typ. Max. Unit VREF (pin 6) test VREF TA=5 ; Iref=mA V Reference Voltage ( note) VREF TA=-0 ; Iref=0mA V VREF TA=5 ; Iref=0mA V Line Regulation.5V < Vcc < 6.5V 0 5 mv Load Regulation VCC (pin 5) 0mA < Iref < 5mA, TA= mv VCC Start up voltage Vstart V VCC Turn off voltage V VCC Start up current TA= ua UVLO Hysteresis Hys V Operating Current ICC TA= ma SRDRVB, SRDRV, PRIDRVB, PRIDRV (pin,,,) Output Low Voltage Vol Isrdrv=-6mA 0.6. V Output High Voltage Voh Isrdrv=6mA V Iout peak source current Iout 0. A Iout peak sink current Iout 0. A PMOS Rdson Rout TA= Ohm NMOS Rdson Rout TA= Ohm Dead Time between PRIDRV and PRIDRVB(TDEAD ) TDead TA=5 (CT discharge time) us Rising Edge Delay Between PRIDRV and SRDRV(TDelay ) Falling Edge Delay Between SRDRV and PRIDRV(TDelay ) TDelay TA=5 5 ns TDelay TA= ns Duty Cycle Range 0 50 % ILIM (pin 8) SS Voltage Hi (SS rise > 5V) TA= V SS Voltage Low (SS rise < 5V) TA= V 05/0/6 Rev. Champion Microelectronic Corporation Page 6

7 CM690T SLS (SRC/LLCSR) Controller with FM PWMs ELECTRICAL CHARACTERISTICS (VCC=V, RT=0.K±%, CT=70PF±%, Freq. = 50 KHz, Duty Cycle=8%, Temp=-0 ~ 5, unless otherwise specified.) Parameter Symbol Conditions Min. Typ. Max. Unit CSS (pin 7) Soft Start Current Iss TA= ua Enable Voltage Ven TA= V Enable Hysteresis Vhys TA=5 00 mv Auto-restart Upper Threshold Vup V Auto-restart Lower Threshold Vlw -Vhyst V FEAO Resonant Error Amplifier (pin ) Input Voltage Range 6 V Transconductance GMV VFB±50mV, TA= umho VFB (Pin) TA= V Feedback Reference Voltage TA= V TA= V Input Bias Current ua Output High Voltage 5.5VBE V Output Low Voltage V Sink Current VFB =50mV, TA= ua Source Current VFB = -50mV, TA= ua Open Loop Gain 60 db DEAO PWM Error Amplifier (pin 6) Input Voltage Range 6 V Reference Voltage V Transconductance Gm TA= umho Input Bias Current ua Output Voltage High VBE V Output Voltage Low V Sink Current -5 ua Source Current 7 ua Open Loop Gain 60 db 05/0/6 Rev. Champion Microelectronic Corporation Page 7

8 CM690T SLS (SRC/LLCSR) Controller with FM PWMs ELECTRICAL CHARACTERISTICS Test conditions: (VCC=V, RT=0.K±%, CT=70PF±%, Freq. = 50 KHz, Duty Cycle=8%, Temp=-0 ~ 5, unless otherwise specified.) Parameter Symbol Conditions Min. Typ. Max. Unit RTCT Oscillator test ; RT=0.K±%;CT=70pF±%, (pin 9) Initial Accuracy TA= Khz Voltage Stability.5V < Vcc < 6.5V % Temperature Stability % Ramp Valley to Peak Voltage Peak voltage:v;valley voltage:.5v V CT Discharge Time (TDEAD ) us Maximum Duty cycle Duty test When DEAO >.0V 8 % Minimum Duty Cycle Duty test When DEAO <.V 0 % SR Ideal Diode function test: Rset=0.K±% ; Rset=5K±% (pin) Pin to Gnd=Rset; Pin to Vref=Rset;Rdeao=50K;Rdeao=M;D_in=.5V TA=5, When Feao=.V.8 6. % Maximum Duty cycle FEAO=.V at frequency (define resonant frequency) KHZ Minimum Duty cycle TA=5, sweep Feao; when FEAO=.57V % Frequency at Minimum Duty cycle TA=5,when FEAO=.57V KHz Note : DO NOT SET D >.5V unless you want to disable Light Load PWMing If Rdeao/Rdeao gain is lower, D needs to even lower. 05/0/6 Rev. Champion Microelectronic Corporation Page 8

9 CM690T SLS (SRC/LLCSR) Controller with FM PWMs TIMING DIAGRAM Dead Time (TDEAD) PRIDRVB PRIDRV (TDelay) Rising Edge Delay Time SRDRVB (TDelay) Falling Edge Delay Time SRDRV OSCILLATOR The oscillator frequency is determined by the values of RT and CT. Design for RT/CT frequency: fosc = / (tramp tdeadtime) tramp = RT * CT * ln((vref ICHG*RT -.5)/(VREF ICHG*RT -)) where ICHG = ICHG current= *(FEAO-VBE)/RSET-(VREF-VRset)/Rset((D_in) -VRset)/Rdeao for current mirror multiply RSET=Pin to Gnd resistor; Pin9 RTCT peak voltage=v; valley=.5v (TDEAD ): Dead Time between PRIDRV and PRIDRVB: Discharge CT tdeadtime=770*ct Rset CM690 Rset VREF 6 Rset Rdeao FEAO VCC PRIDRV 5 RT Rdeao 5 D_IN- D_IN PRIDRVB SRDRV SRDRVB RTCT fsw = CT 6 DEAO RT/CT 9 05/0/6 Rev. Champion Microelectronic Corporation Page 9

10 RESONANT SECTION FM Modulator CM690T SLS (SRC/LLCSR) Controller with FM PWMs Frequency modulation of the resonant controller section is accomplished by controlling the charging current of the oscillator through resonant error amplifier. The switching frequency of the resonant section is ½ of the oscillator frequency (RT/CT). Compensation is accomplished by connecting R and C in series to the FEAO pin. PWMINGS : SR Ideal Diode PWMING (Synchronous Outputs) SR Ideal Diode PWMING for synchronous drivers is accomplished by comparing the voltage signal at the RSET pin to RTCT ramp. The pulse-width reduction happens when the voltage at the RSET is lower than.5v. This allows safe operation of the power converter with synchronous rectification when the switching frequency is below the highest resonant point frequency fr.avoid Mosfet revise current in SR application. Rf Rf Vout VFB.5V - (Voltage Control Current) FEAO. V To l RSET Rest Rset Vref.5V OSC RT CT Vref - V.5V. TO Logic Decreasing Pulsewidth with V(RSET)<.5V SRDRV PRIDRV SR Ideal Diode PWMING Light Load PWMING In a typical Application, low gain configuration accomplished by connecting R deao and R deao in the closed loop configuration. The gain for the PWM is determined by R deao and R deao where the gain is equal to R deao /R deao. The voltage of VR set at which the controller goes into FM and PWM simultaneously is equal to : VRset = D_IN (R deao /R deao ) - (R deao /R deao ) where is the peak voltage of RTCT Vary in R set from VR set to VR set.75 R deao /R deao will cause the duty cycle to vary from 50% to 0% while the frequency will vary proportionally according to.75*r deao /R deao where.75 is the peak-to-peak voltage of the RTCT ramp. For proper operation, select R deao value so that the current through R deao {((D_IN) -.5)/R deao } should be less than 5uA. 05/0/6 Rev. Champion Microelectronic Corporation Page 0

11 CM690T SLS (SRC/LLCSR) Controller with FM PWMs Vout Vref Rf Rf VFB.5V -. (Voltage Control Current) FEAO V To l Rest RSET Vref OSC RT CT Rdeao Rset Vref Rdeao D_IN- -. DEAO - D_IN. PWM RTCT Soft Start and Enable Soft start of the FM and PWM is controlled by the selection of the external capacitor at CSS pin (note). A typical current source of 7.5uA supplies the charging current for the capacitor. Soft start of the FM and PWM begins at V. When SS is less than V, FEAO is forced to 5.5VVBE by internal circuit. When SS is above V, FEAO is no longer forced to 5.5V VBE. As soon as SS is above V, FEAO frequency modulation loop becomes active (VFB-(SS-)*GMV and FEAO Voltage will be determined by the FEAO error amplifier which is a function of SS signal and the VFB signal. When ss rise reach to.5v, it mean main converter into close loop control. The soft start pin CSS also serves as an enable function. The output drivers are enabled when CSS pin reached V. 05/0/6 Rev. Champion Microelectronic Corporation Page

12 CM690T SLS (SRC/LLCSR) Controller with FM PWMs Auto-retry Mode During normal operation, CSS pin will be charged to 5.5V VBE. a)when VFB exceeds.9v O.V.P detect b)vfb less than 0.5V avoid VFB short to GND. c)ilim exceeds V due to over current condition. Output drivers are immediate set to low, and CSS begins to discharge with 0.75uA current source. When CSS pin is below 0.9V, 7.5uA current source start charging the CSS pin. When CSS pin reaches V, the output drivers are re-enable and the controller goes into soft start mode. If over current condition still exists then, the outputs are immediately disabled, but CSS continues to charge toward 5V. When CSS reaches 5V, 7.5uA charging current is disabled and 0.75uA current source begins to discharge the CSS, and the cycle repeat until over current condition is removed. OCP SETTING 5.5 VVBE 5V Css 0.9V V ILimit 05/0/6 Rev. Champion Microelectronic Corporation Page

13 TYPICAL APPLCATION CIRCUIT CM690T SLS (SRC/LLCSR) Controller with FM PWMs PFC L H5 F 50V 6.A HSB T TR8*0*0 T TR8*0*0 BD D0XB60 (0A/600V) N FR 90K /W C5 0pF/KV C6 0pF/KV C 0.uF 75V C 0.uF 75V t - BC uf/50v (High inrush current resister) R 0. H RT.5Ω/5A RL 85NL-A-B-C 9V Q6 VCCP C69 D ZD6 R9 80VDC C6 0.7uF R M R M R- K R6 7 D8 N8 D9 N8 D0 N8 R6.M R5 M Vref/ C 0.07UF R5 0K C0 000pF C9 00pF U CM6500/0 Family IEAO IAC VEAO VFB ISENSE VREF Vrms VCC C n Vref/ C7 0.uF R7 50K VCCP C 0.7uF C70 uf/5v C0 0pF 80VDC R M % R00 0K R M % R K % Q N Q N907 L CS VCCP R9 0 9 D SCS0P D6 N506 R0 K (A/600V) D7 HFA08TB60 (8A/600V) Q 0N60C (0A/600V) C9 0uF/50V Vref/ R- 6.5K R 7K C5 0.uF C7 0.7uF R 69.8K % R8 7K C 000pF 5 0 SS PFC OUT 6 9 PGTHL PGB 7 8 RAMP GND PGB R9 R 0 C77 700P R 0 PGIB/ C8 000pF Standby D EFM0 (A/50V) Q8 N VS 80VDC VCC R W(S) C76 00uF/00V GND GND GND D. BP 8 GND EN ZD P6KE50A 5% D BYV-6E R8 5K C0 C 00uF/5V R5 M R6 M D SF 85TS TS T EE-9.mH 6 8TS 8 C8 00uF/5V 7 8TS C 000pF/50V 5 D SB000 D5 R9 N (A/000V) R7 0 R.7KΩ ZD ZMM(5V) C 70UF/5V C5 0uF/5V VDD R95.7KΩ.5TS L DR6*8. C 00UF/6V Q7 N700 PCA LTV87 ZD R96 7KΩ VSB H6 C75 0.7uF ZD9 ZMM(V) C9 7uF/5V V ON/OFF VSB A U TNY77P C7 0.UF/50V V D0 VSB R5 0 C8 0uF/50V ZD5 HZ5-.50~5.0V C68 M/50V Y PCA 87C ON/OFF CN CON R9 5.6K C C6 R56 50 R5 K C0 0.UF/5V IC KAAZ R58 0K R55 0K % R59.5K % VCC PCB LTV87 R50 7.5K R9 Q9 N ZD N75A 5.~6.8V VCCP 05/0/6 Rev. Champion Microelectronic Corporation Page

14 CM690T SLS (SRC/LLCSR) Controller with FM PWMs 05/0/6 Rev. Champion Microelectronic Corporation Page R Lp(.7mH) C5 680uF/5V R6 7KΩ DRVH 80VDC C5 0.uF C7 00uF/6V D9 BAV99 DRVL C56 uf/50v D0 BAV99 TS Q FCPN60 C5 VSYNDRVH R98 0KΩ DRVHGND C55 05pF -V C C50 0.uF V 7TS VIS C8 00uF/6V C6 00uF/5V R67 70 D7 N8 VSYNDRVL R6 0Ω R6 7KΩ TS Q IR F80PBF T PQ L 60uh/PQ R65 7KΩ IPLIMIT C9 0.uF DC-DC -V H0 D6 N8 IPLIMIT JP C5 0.uF TS OUT R60 0Ω R9 0 L 0nH/0A HS6 HS C 8nF/800V Q5 IR F80PBF Q FCPN60 (A/00V) D8 EFM0 C5 70uF/6V R6 7KΩ R deao M C57 7uF/5V Q N Q6 N R80 KΩ R87 7KΩ R79 56KΩ R76 Ω R deao 50K D6 SCS0P C79 nf C58 uf/50v R7 6K % Q N907 Q N907 Q7 N907 R85 56KΩ C6 uf/6v PGB From CM6500/0 Family VS R89 Ω REMOTEOFF/FPOB C6 7pF VREF C67 0.uF/5V VSYNDRVL VS VS VREF V R7 K D7 SCS0P R 0K Q8 N700 R8 5K R0 5.K SD PGI SD V VS PGB DRVHGND IPLIMIT PCA 87B C7 R0 00K T5 EE R77 0KΩ R.8K ZD5 N8 C60 700pF SLS Controller R7 750 R0 8.K Q5 N907 C6 U CM690 Family VCC Rset VFB FEAO D_IN- PRIDRV PRIDRVB CSS Ilim RT/CT SRDRV SRDRVB D_IN VREF DEAO GND D SCS0P Q N VREF C65 uf/5v Vref/ DRVL VSYNDRVH Q0 N VS R75 6.5KΩ VS DRVH C66 000pF VS C59 VS R78.K R88 KΩ

15 PACKAGE DIMENSION CM690T SLS (SRC/LLCSR) Controller with FM PWMs 6-PIN PDIP (P6) PIN ID θ θ 6-PIN SOP (S6) 05/0/6 Rev. Champion Microelectronic Corporation Page 5

16 CM690T SLS (SRC/LLCSR) Controller with FM PWMs IMPORTANT NOTICE Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of CMC products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer s applications, the customer should provide adequate design and operating safeguards. CMC assumes to no liability to customer product design or application support. CMC warrants the performance of its products to the specifications applicable at the time of sale. HsinChu Headquarter 5F, No., Park Avenue II, Science-Based Industrial Park, HsinChu City, Taiwan Sales & Marketing F., No. 96, Sec., Sintai 5th Rd., Sijhih City, Taipei County 0, Taiwan, R.O.C. T E L : T E L : FAX: FAX: /0/6 Rev. Champion Microelectronic Corporation Page 6