STEVAL-ILD002V1
20 W dimmable CFL ballast solution based on the L6574
Data Brief
Features
Lamp base: E27 Wattage: 20 W (3U T3 lamp) Input line: 180 VAC - 264 VAC Lumen output: 1300 lm Dimming range: 20% - 100% Energy label: Class A Efficiency > 80% at wide range input
Description
This demonstration board represents a 20 W dimmable CFL (compact fluorescent lamp) ballast solution which can completely replace incandescent lamps in dimming systems. The controlled dimming range is from below 20% up to 100% of full light output without changing the triac dimmer. Compared to formal CFL designs, this dimmable solution provides not only energy savings, but also higher reliability and significantly longer operating life. The solution is based on the high performance ballast driver L6574, two STD4NK50Z power MOSFETs, a Zener-protected SuperMESHTM power MOSFET and two STTH1L06 Turbo 2 ultrafast high voltage rectifiers.
STEVAL-ILD002V1
June 2008
Rev 1
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www.st.com 4
For further information contact your local STMicroelectronics sales office.
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Schematic diagram
Figure 1.
L1 Dbl R7 680 pF / 630 V 68 C6 2.8 mH
STH1L06 R8 220 k 1N4148 C7 100 nF Q1 IC 2 2 7 6 5 4 3 3 R6 68 K R14 10 K C9 C8 470 pF 150 nF 1 1 10 10 8 8 9 9 22 Q2 STD4NK50z 14 14 22 R11 15 15 7 6 12 12 R10 Cb Lr 100 nF / 400 V 2.8 mH 16 16 C3 100 nF R12 75 K R4 10 k D5 STD4NK50z
ZD1 1.5 V
Schematic diagram
Circuit schematic
Cf1
D1
D2 33 nF
Rin C2 10 F / 25 V
Lin
10
4.7 mH
C1 10 F / 450 V
L6574
11 11
D3 33 nF 1N4148 D6 R5 100 K 4
D4
Cf2
C4 47 nF 5
34 Lamp
5.6 nF / 1200 V Cr R9 2 12
R1 470 K R3
5.1 K C5 100 nF Db2
R2 560 22 F /25 V
C10
GND
STTH1L06
STEVAL-ILD002V1
AM00205
STEVAL-ILD002V1
Revision history
2
Revision history
Table 1.
Date 10-June-2008
Document revision history
Revision 1 Initial release. Changes
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STEVAL-ILD002V1
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