APPLICATION NOTE AN-1021 International Rectifier • 233 Kansas Street El Segundo CA 90245 USA IR2159: 40W/PL-L Lamp Dimmable Ballast By T. Ribarich and E. Thompson TOPICS COVERED Introduction Functional Description Schematic Diagrams Bill of Materials Waveforms / Measurements Please Note: This demoboard has been adjusted for the PL-L/40W lamp type. INTRODUCTION The following design is a fully-functional dimming ballast adjusted specifically for the PL-L/40W lamp type. The design includes EMI filter, rectifier, active PFC, ballast output stage and IR2159 Dimming Control IC. 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 IR2159 Dimming Control IC is used to regulate lamp power, set the minimum and maximum brightness levels and protect the ballast against conditions such as lamp strike failures, filament failures, low DC bus, thermal overload or lamp failure during normal operation. Please note that this design does not include a complete EMI filter or an isolated dimming interface. 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 C13. 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 C15 and C16. The DC blocking capacitor, C13, is also placed outside the under-damped resonant circuit loop such that it does not influence the natural resonance frequency of L3 and C14. The snubber capacitor, C12, also serves as a charge-pump for supplying the IR2159 and PFC IC. Resistors RMIN and RMAX have been adjusted for each lamp type to set the minimum and maximum brightness levels (See Table 1). www.irf.com 1 R19 AC Rectified Line L3 VBUS (+) C13 L3A (3T) R5 R4 C15 RVDC CVDC R13 1 VDC HO 16 2 VCO VS 15 3 CPH VB 14 M2 C14 CVCO C8 CPH IR2159 4 DIM 5 MAX 6 MIN LO 11 7 FMIN CS 10 8 IPH SD 9 RDIM RMAX C12 D3 VCC R23 R24 13 C8 D4 C9 COM 12 M3 R14 L3B R17 (3T) R15 C16 RFMIN R16 RMIN + 0 to 5VDC Dimming - RIPH C10 C11 R18 D5 VBUS (-) Figure 1: Ballast Output Stage with Voltage Mode Heating 2 www.irf.com Schematic Diagram www.irf.com R19 L3 L2 C13 L1 L3A D2 R6 (3T) R5 R1 R4 L C15 RV1 R10 C2 RVDC D1 R2 N BR1 CVDC R13 R11 1 VDC HO 16 2 VCO VS 15 M2 C7 C14 CVCO GND 1 8 C1 R20 C6 C5 2 3 7 L6560 CPH R7 M1 6 3 CPH 4 DIM 5 MAX 6 MIN RDIM 4 5 RMAX R12 R3 C4 C12 D3 13 COM 12 LO 11 R24 R23 C8 C9 7 FMIN CS 10 8 IPH SD 9 D4 L3B (3T) M3 R17 R15 C16 RFMIN R16 RMIN 0.5 to 5VDC DIM INPUT 14 VCC R14 R8 (+) VB IR2159 C3 C8 RIPH C10 C11 R18 D5 (-) Note: Thick traces represent high-frequency, high-current paths. Lead lengths should be minimized to avoid high-frequency noise problems 3 Item # 1 2 3 4 Qty 1 1 1 2 5 4 Manufacturer International Rectifier Roederstein RG Allen RG Allen Part Number DF10S WY0222MCMBF0K 275MKP334K 400MPS104K06A Description Bridge Rectifier, 1A 1000V Capacitor, 2.2nF 275 VAC Y Capacitor, 0.33uF 275 VAC Capacitor, 0.1uF 400 VDC Reference BR1 C1 C2 C3, C13 1 RG Allen S1206Z103K1HRN Capacitor, 0.01uF SMT 1206 C4 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 3 1 2 1 1 1 1 2 1 1 2 3 1 1 1 1 1 RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen Diodes International Rectifier Diodes ST International Rectifier Panasonic RG Allen S1206Z474K1HRN 2V10M350TB110X20 S1206Z104K1HRN S1206Z274K1HRN 1H4R7M50TB15X11 S1812N152K3ARN 1600PPSA682K09A R15W334M1HA5R S1206N222K2ARN S1206N101K2ARN LL4148DICT-ND 10BF60 ZMM5247BCT L6560 IR2159 ELF-15N007A RGA-K86960 C5, C6, CVDC C7 C8, C11 CPH C9 C12 C14 C15, C16 CVCO C10 D1, D4 D2, D3 D5 IC1 IC2 L1 L2 23 1 RG Allen To be determined 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 Total 1 2 2 1 2 3 1 3 1 1 1 1 1 2 1 1 1 1 3 1 1 2 64 International Rectifier International Rectifier RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen RG Allen IRF820 IRF820 CR32C684JT CR32C752JT CR32C824JT CR32C103JT CR32C223JT CR32C220JT RSMF1/2W1R0FT RSMF1/2WR91FT CR32C273JT CR32C105JT CR32C102JT CR32C104JT R25G105JT R25G283JT R25G163JT CR32C243JT R25G104JT CR32C303JT RV05K300 CR32C100JT Capacitor, 0.47uF SMT 1206 Capacitor, 10uF 450VDC 105C Capacitor, 0.1uF SMT 1206 Capacitor, 0.27uF SMT 1206 Capacitor, 4.7uF 50VDC 105C Capacitor, 1nF 1KV SMT 1812 Capacitor, 6.8nF,1600V Capacitor, 0.22uF, 50V Capacitor, 22nF SMT 1206 Capacitor, 220pF SMT 1206 Diode, 1N4148 SMT DL35 Diode, SMT SMB Diode, Zener 17V SMT DL35 IC, Power Factor Controller IC, Ballast Driver EMI Inductor, 1X10mH 0.7Apk PFC Inductor, 2.0mH 2.0Apk Inductor, 2.0mH, 2.5Apk with secondary windings of 3 turns Transistor, MOSFET Transistor, MOSFET Resistor, 680K ohm SMT 1206 Resistor, 7.5K ohm SMT 1206 Resistor, 820K ohm SMT 1206 Resistor, 10K ohm SMT 1206 Resistor, 22K ohm SMT 1206 Resistor, 22 ohm SMT 1206 Resistor, 1 ohm ½ watt Resistor, 0.91 ohm ½ watt Resistor, 27K ohm SMT 1206 Resistor, 1.0M ohm SMT 1206 Resistor, 1K ohm SMT 1206 Resistor, 100K ohm SMT 1206 Resistor, 1.0M ohm ¼ watt Resistor, 28K ohm ¼ watt Resistor, 16K ohm ¼ watt Resistor, 24K ohm SMT 1206 Resistor, 100K ohm ¼ watt Resistor, 30K ohm SMT 1206 Transient Suppressor Resistor, 10 ohm SMT 1206 L3, L3A,L3B M1 M2, M3 R1, R2 R3 R10, R11 RDIM, RIPH, R12 R6 R7, R13, R14 R8 R18 RVDC R17 R15 R16, R20 R5 RMAX RIPH RMIN 1 R4, R18, R20 RFMIN RV1 R23, R24 www.irf.com Figure 2: Lamp Voltage during Ignition (500V/div) Figure 4: VS & CS during 10% Dimming www.irf.com Figure 3: Filament Current during Preheat Figure 5: VS & CS during 100% Dimming 5 Parameter Units PL-L/40W Preheat Frequency kHz 58 Lamp Preheat Voltage Vpp Vpp 520 Ignition Frequency KHz kHz 46 kVpp 2.0 100% Dimming Frequency kHz 45 100% Lamp Voltage Vpp 400 Watts 40.0 Lamp Ignition Voltage 100% Ballast Input Power 100% Ballast Power Factor 0.99 5% Dimming Frequency kHz 55 5% Lamp Voltage Vpp 535 Watts 11.0 5% Ballast Input Power Table 1: Ballast Measurement Summary IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105 Data and specifications subject to change without notice. 10/21/2000 6 www.irf.com