20 W dimmable CFL ballast solution based on the L6574
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.
STEVAL-ILD002V1
Data Brief
STEVAL-ILD002V1
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 SuperMESH™
power MOSFET and two STTH1L06 Turbo 2
ultrafast high voltage rectifiers.
June 2008 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Schematic diagram STEVAL-ILD002V1
1 Schematic diagram
Figure 1. Circuit schematic
L1
2.8 mH
680 pF / 630 V
C6
R7
68 Ω
ZD1
1.5 V
D5
Q1 STD4NK50z
C7 100 nF
12 16
IC
1N4148
C3
100 nF
C1
10 µF / 450 V
Lr
Cb
R10
22 Ω
15
15
12 16
2
2
R12
75 KΩ
2.8 mH
100 nF / 400 V
R11
14
11
14
7
7
6
R4
10 kΩ
5.6 nF /
34
22 Ω
9
11
L6574
6
5
C4
47 nF
Cr
1200 V
Lamp
STD4NK50z
Q2
8
9
8
5
4
4
D6
110
3
R5
12
R9
2 Ω
110
3
100 KΩ
C8
C9
R6
150 nF
470 pF
68 KΩ
R14
AM00205
10 KΩ
Dbl
R8
STH1L06
220 kΩ
C2
Cf1
33 nF
D1 D2
Lin
Rin
2/4
10 µF
/ 25 V
4.7 mH
10
D3 D4 Cf2
R1
1N4148
33 nF
R3
470 KΩ
C5
100 nF
Db2
STTH1L06
22 µF
/25 V
C10
R2
560 Ω
5.1 KΩ
GND
STEVAL-ILD002V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
10-June-2008 1 Initial release.
3/4
STEVAL-ILD002V1
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