Application Note AN-1020
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1 Application Note AN-1020 IR21571: T5 Lamp Ballast Using Voltage-Mode Filament Heating By T. Ribarich, E. Thompson Table of Contents Page Introduction...1 Functional Description...1 Schematic Diagram...3 Bill of Materials...4 Ballast Input/Output Measurements...6 T5 lamps are becoming more popular due to their lower profile and higher lumen/watt output. These lamps, however, can be more difficult to control due to their higher ignition and running voltages. A typical ballast stage using current-mode filament heating (filaments placed inside L-C tank) will result in excessive lamp voltage during preheat and excessive filament current during running. The output stage has therefore been modified for voltage-mode filament heating using secondary windings off of the resonant inductor. The result is a more flexible ballast output stage necessary for fulfilling the lamp requirements. The IR21571 Ballast Control IC is used to program the ballast operating points and protect the ballast against conditions such as lamp strike failures, filament failures, low DC bus, thermal overload or lamp failure during normal operation. AN-1020 cover
2 APPLICATION NOTE AN-1020 International Rectifier 233 Kansas Street El Segundo CA USA IR21571: T5 Lamp Ballast Using Voltage-Mode Filament Heating By T. Ribarich, E. Thompson TOPICS COVERED Introduction Functional Description Schematic Diagrams Bill of Materials INTRODUCTION T5 lamps are becoming more popular due to their lower profile and higher lumen/watt output. These lamps, however, can be more difficult to control due to their higher ignition and running voltages. A typical ballast stage using current-mode filament heating (filaments placed inside L-C tank) will result in excessive lamp voltage during preheat and excessive filament current during running. The output stage has therefore been modified for voltage-mode filament heating using secondary windings off of the resonant inductor. The result is a more flexible ballast output stage necessary for fulfilling the lamp requirements. The IR21571 Ballast Control IC is used to program the ballast operating points and protect the ballast against conditions such as lamp strike failures, filament failures, low DC bus, thermal overload or lamp failure during normal operation. FUNCTIONAL DESCRIPTION The output stage has been modified for voltage-mode filament heating (Figure 1). The lamp has been placed outside the under-damped resonant circuit loop which consists of L3 and C15. The filament heating during preheat and dimming is achieved using voltage-mode filament heating with secondary windings off of the resonant inductor (L3A, L3B). The filament heating during preheat (see figure 4) can be adjusted with capacitors C18 and C19. The DC blocking capacitor, C16, is also placed outside the under-damped resonant circuit loop such that it does not influence the natural resonance frequency of L3 and C15. The snubber capacitor, C14, also serves as a charge-pump for supplying the IR21571 and PFC IC. 1
3 AC Rectified Line (+) L3 C17 L3A R11 R12 C18 R10 C9 1 VDC HO 16 R13 M2 2 VS 15 C16 CRAMP RT RPH CSTART RSTART CT RDT 3 RPH 4 RT RRUN 5 RUN 6 CT 7 DT IR VB VCC COM LO CS D3 C11 C10 R14 R15 C12 M3 R16 R17 R19 D4 C14 L3B ROC 8 OC SD 9 R18 C19 COC CCS C13 RCS D5 (-) Figure 1. Ballast Output Stage with Voltage Mode Heating 2
4 3 L N GND L1 C1 RV1 C2 BR1 C3 R1 R2 R3 R6 R4 R5 C5 C D6 L6560 L D1 C6 R7 R8 R9 M1 D2 C8 Note: Thick traces represent high-frequency, high-current paths. Lead lengths should be minimized to avoid high-frequency noise problems CT R10 C9 RT CSTART ROC CRAMP RSTART RPH RDT COC R11 RRUN VDC RPH RT RUN CT DT OC IR HO 16 VS VB VCC 13 COM 12 LO 11 CS 10 SD 9 CCS D3 C11 R13 C10 R14 R16 R17 C13 R12 R15 C12 R18 M3 RCS M2 R19 D4 C14 D5 L3 C16 C17 L3A C18 L3B C19 Schematic Diagram
5 Bill of Materials Lamp type: T5/35W/28W/14W Line Input Voltage: VAC/ Hz Item # Qt Manufacturer Part Number Description Reference 1 1 International Rectifier DF10S Bridge Rectifier, 1A 1000V BR1 2 1 Roederstein WY0222MCMBF0K Capacitor, 2.2nF 275 VAC Y Cap C1 3 1 RG Allen 275MKP334K Capacitor, 0.33uF 275 VAC C2 4 1 RG Allen 400MPS104K06A Capacitor, 0.1uF 400 VDC C3 5 2 RG Allen S1206Z103K1HRN Capacitor, 0.01uF SMT 1206 C4, CSTART 6 2 RG Allen S1206Z474K1HRN Capacitor, 0.47uF SMT 1206 C5,C6 7 1 RG Allen 2V10M350TB110X20 Capacitor, 10uF 350VDC 105C C8 8 3 RG Allen S1206Z104K1HRN Capacitor, 0.1uF SMT 1206 C10, C11, COC 9 3 RG Allen S1206Z224K1HRN Capacitor, 0.22uF SMT 1206, C9, CRAMP 10 1 RG Allen 1H4R7M50TB15X11 Capacitor, 4.7uF 50VDC 105C C RG Allen S1812N152K3ARN Capacitor, 1.5nF 1KV SMT 1812 C RG Allen 1600PPSA472K09A Capacitor, 4.7nF,1600V C RG Allen 400MEF224K08A Capacitor, 0.22uF, 400V C RG Allen R15W334M1HA5R Capacitor, 0.33uF, 50V C18, C RG Allen S1206N471K2ARN Capacitor, 470pF SMT 1206 CT 16 1 RG Allen S1206N101K2ARN Capacitor, 100pF SMT 1206 CCS 17 2 Diodes LL4148DICT-ND Diode, 1N4148 SMT DL35 D1, D International Rectifier 10BF60 Diode, SMT SMB D2, D3, D Diodes ZMM5247BCT Diode, Zener 17V SMT DL35 D ST L6560 IC, Power Factor Controller IC International Rectifier IR21571 IC, Ballast Driver IC Panasonic ELF-15N007A EMI Inductor, 1X10mH 0.7Apk L RG Allen RGA-K86960 PFC Inductor, 2.0mH 2.0Apk L RG Allen To be determined Inductor, 4.0mH, 1.5Apk with 2 secondary windings of 4 turns L3, L3A,L3B 25 3 International Rectifier IRFBC30 Transistor, MOSFET M1, M2, M RG Allen CR32C684JT Resistor, 680K ohm SMT 1206 R1, R RG Allen CR32C752JT Resistor, 7.5K ohm SMT 1206 R RG Allen CR32C824JT Resistor, 820K ohm SMT 1206 R4, R RG Allen CR32C103JT Resistor, 10K ohm SMT 1206 R RG Allen CR32C223JT Resistor, 22K ohm SMT 1206 R7, RSTART 31 3 RG Allen CR32C220JT Resistor, 22 ohm SMT 1206 R8, R13, R RG Allen RSMF1/2W1R2FT Resistor, 1.2 ohm ½ watt R9, RCS 33 1 RG Allen CR32C563JT Resistor, 56K ohm SMT 1206 R RG Allen R25G225JT Resistor, 2.2M ohm ¼ watt R RG Allen CR32C102JT Resistor, 1K ohm SMT 1206 R RG Allen R25G394JT Resistor, 390K ohm ¼ watt R12, R RG Allen R25G105JT Resistor, 1.0M ohm ¼ watt R RG Allen CR32C243JT Resistor, 24K ohm SMT 1206 ROC 39 1 RG Allen CR32C273JT Resistor, 27K ohm SMT 1206 RPH 40 1 RG Allen CR32C104JT Resistor, 100K ohm SMT 1206 RRUN 41 1 RG Allen CR32C103JT Resistor, 10K ohm SMT 1206 RDT 42 1 RG Allen CR32C203JT Resistor, 20K ohm SMT 1206 RT 43 1 RG Allen RV05K300 Transient Suppressor RV RG Allen CR32C103JT Resistor, 10 ohm SMT 1206 R14, R15 Total
6 Figure 2, Inductor Current During Ignition (500mA/div) Figure 3, Lamp Voltage During Ignition (500V/div) Figure 4, Filament current during Preheat (T5/35W) Figure 5, VS & CS during preheat (T5/35W) Figure 6, VS & CS during running (T5/35W) 5
7 Parameter T5/35W T5/28W T5/14W Preheat Frequency 60 khz 60 khz 60 khz Lamp Preheat Voltage 350 Vpp 350 Vpp 350 Vpp Lamp Ignition Voltage 2KVpp 2KVpp 2KVpp Run Frequency 42 khz 42 khz 42 khz Ballast PF Lamp Running Voltage 720 Vpp 575 Vpp 265 Vpp Ballast Input Power 35W 28W 14W Table 1. Ballast Input / Output Measurements IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California Tel: (310) Data and specifications subject to change without notice. 10/21/
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