Data brief
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December 2009 Doc ID 16766 Rev 2 1/4
4
STEVAL-ILL026V1
3 W non-isolated offline LED driver
demonstration board based on the VIPer22A-E
Features
■Input voltage: 90 to 265 VRMS
■Provides 350 mA constant current for LEDs
■Capable of driving 3 x 1 W LEDs in series with
high-precision constant current (± 5%
tolerance)
■Overtemperature protection
■LED open circuit protection
■LED short-circuit protection
■230 VAC input version with no electrolytic
capacitor
■EN55015 & EN6100-3-2 compliant
■RoHS compliant
Description
The progress made in the field of LEDs is visible
on an almost day-by-day basis. Many high power
LEDs are currently on the market, such as 0.7 A
and 1 A devices. However, the most commonly
used LEDs are those with a current of 0.350 A.
This demonstration board is designed for 350 mA
LEDs and is capable of driving three 1 W LEDs in
series with high-precision constant current (± 5%
tolerance). The design is based on the VIPer22A-
E, which combines a dedicated current mode
PWM controller with a high voltage power
MOSFET on the same silicon chip.
The internal control circuit offers a large input
voltage range on the VDD pin, accommodates
changes in auxiliary supply voltage, and supports
automatic burst mode in low load conditions. The
board also features protections against
overtemperature, overcurrent and overvoltage
conditions.
STEVAL-ILL026V1
www.st.com
Schematic diagram STEVAL-ILL026V1
2/4 Doc ID 16766 Rev 2
1 Schematic diagram
Figure 1. STEVAL-ILL026V1 schematic diagram
AM05447v1
FB
F
B
C7
330nF 400VDC/ 470nF 4
00VDC
C7
330nF 400VDC/470nF400VD
C
R2
4K7 1/4
R2
4
K
71
/4
R4
10K1/4
R4
10K1/4
D4
STTH1R06
D
4
ST
TH1R0
6
L
1
1m H-100mA
1
1m H -100
R5 1R5_1/4_1%
R5 1R5_1/4_1%
DRAIN
SOURCE
C
O
NTROL
FB
VIPER 22
DRAIN
SOURCE
CONTROL
FB
VIPER 22
28
1
3
5
7
4
6
+
C3
2.2uF4
50v
+
C3
2
.2u
F4
5
0v
L2
1mH
L2
1
m
H
-+
D3
B
RID
G
E
-+
D3
BRIDGE
1
3
2
4
C4
330nF1
6
V
C
4
3
30
n
F1
6V
D139V 500mW D139V 500mW
12
R
710 -1W_10%
R7 10 -1
W_10%
J
1
CON2
J1
C
ON2
1
2
J2
C
O
N
2
J2
CON2
1
2
C8
330
n
F4
0
0VDC
C8
330nF 400VDC
C5
2
2
uF50V
C
5
22uF50V
C6
330nF 16V
C6
330nF 16V
R6
6
K
81/4
R6
6K8 1/4
C122uF50V C122uF50V
D2
S
T
TH1R06
R06
Q2
BC547A
Q2
BC547A
R3
10K 1/4
R3
1
0
K1
/4
R1
4k7 1/4
R1
4k7 1/4
Q1
BC557A
Q1
BC557A
Vdd
Vdd
STEVAL-ILL026V1
4/4 Doc ID 16766 Rev 2
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