STMICROELECTRONICS STEVAL

STEVAL-ILL017V1
Offline constant current LED driver based on the VIPer17
Data Brief
Features
■
Input voltage 220 VAC +/- 20%
■
800 V avalanche rugged power section
■
Provides 500 mA constant current for LED
■
High precision constant current with +/- 5%
tolerance (1 sense resistor and 2 resistor
bridges with +/- 1% precision)
■
Overtemperature protection
■
LED open-circuit protection
■
LED short-circuit protection
■
PWM operation with frequency jittering for low
EMI
■
Operating frequency:
– 60 kHz for L type
– 115 kHz for H type
■
Standby power < 50 mW at 265 VAC
■
Adjustable and accurate overvoltage
protection
■
On-board soft-start
■
Safe auto-restart after a fault condition
STEVAL-ILL017V1
VDC source, suitable for illuminating two LEDs in
series.
The VIPer17 device is an offline converter with an
800 V rugged power section, a PWM control,
overcurrent protection, overvoltage and overload
protection, hysteretic thermal protection, soft-start
and safe auto-restart after the removal of a fault
condition. The brown-out protection function is
embedded into the high voltage start-up.
Applications
■
Adapters for PDAs, camcorders, electric
shavers, cellular phones, videogames
■
Auxiliary power supply for LCD/PDP TVs,
monitors, audio systems, computers, industrial
applications
■
SMPS for set-top boxes, DVD players/
recorders, white goods
Burst mode operation and the very low
consumption of the device combine to meet
standby energy saving regulations. Advanced
frequency jittering reduces EMI filter cost.
Description
The STEVAL-ILL017V1 demonstration board is a
2 W non-isolated offline constant current LED
driver based on the VIPer17. The board operates
with an input ranging from 176 V to 264 VAC and
provides 500 mA of constant current from a 7
September 2008
Rev 1
For further information contact your local STMicroelectronics sales office.
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www.st.com
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1
2
AC In
P1
GND
GN
1
3
4
2
C1
C12
10uF
10u
1mH
L2
C1
1nF
1n
Con
Cont
Vdd
Vd
FB
BR
Sourc
Source
R1
R13
2.7K
2.7
C4
C6 56nF
56n
2.2n
2.2nF
2
3
C3
2.2uF
2.2u
VP
Drai
DrainDrain
Drai
U1
ER17
VI PER1
C1
C11
2.2uF
2.2u
R4
56
56K
R1
240
240K
D3
BAT4
BAT46
1
D1
Bridg
dge
C2
100nF
100n
2
VPOS
4
VNeu
VNe
8
7
6
5
1
VL _Fus
use
Q1
BC817
BC817-40
GND
GN
R1
R14
1M
10
5
1
6
7
nsformer
Transfor
3 T1
8
100K
100
R3
R6
STTH1R06
STTH1R06A
C5
10u
10uF
D5
rain
Drain
R5
10K
10
C8
100nF
100n
STP
S2H100
ST S2H100A
D6
C7
12n
12nF
8
82K
82
R7
GND
GN
C1
C13
1uF
1u
Out2
Out1
Vcc+
Vcc
C9
220uF
220u
6.8
6.8K
R2
U2
TSM103W
ccVcc
Inv1 Nonin
Noninv1
4
3K
R8
Inv2 Nonin
Noninv2
6
Fuse
use 250V
7
1
2/4
2
C10
C1
R1
R10
3.3
3.3K
470pF
470p
1.2
R1
R11
24K
24
R12
R1
1.2
R9
LED
ED Ou
Out
1
2
P2
Figure 1.
5
1
3
Fuse1
e1
Circuit schematic
STEVAL-ILL017V1
Circuit schematic
Schematic diagram
VLine
STEVAL-ILL017V1
2
Revision history
Revision history
Table 1.
Document revision history
Date
Revision
01-Sep-2008
1
Changes
Initial release.
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STEVAL-ILL017V1
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