ST ISA008V1 User Manual
Low cost wide range power supply for LCD or TV,
28 W output demonstration board based on the VIPer53-E
Features
■ Input voltage
– Vin: 90 - 264 Vrms f: 45-66 Hz
■ Output voltages
– 3.3 V ± 2 % at 1 A - dedicated to panel and
digital circuitry for scaling
– 7 V ± 8 % at 0.2 A - dedicated to post-
regulator for microprocessor
– 12 V ± 8 % at 2 A - dedicated to backlight
lamp inverters, audio and SCART
– 35 V ± 10 % at 10 mA - dedicated to tuner
for TV-LCD
■ Standby
– Input power less than 1 W at 230 Vac,
delivering 30 mA on 7 V
■ Overcurrent protection
– On all outputs, with auto-restart at short
removal
■ PCB type & size
– Cu single side 35 mm, CEM-1, 130 x 70
mm
■ Safety
– According to EN60950, creepage and
clearance minimum distance 6.4 mm
■ Emc
– According to EN50022 Class B
■ RoHS compliant
Description
STEVAL-ISA008V1
Data brief
STEVAL-ISA008V1
The standby performance is very good, and the
power consumption during standby is 800 mW at
230 Vac.
The circuit is also fully protected against faults
such as output short-circuit or overvoltage.
The design pays particular attention to the final
cost of the solution, so the PCB has been
designed as single layer, and the circuit has no
heat sink. The technology used is the standard
through-holes, but can be easily changed to SMT
as most of the components are available also in
this technology. The circuit has been tested
thoroughly in all the most relevant aspects with
positive results and has been integrated with a
15" LCD-TV application without showing any
problems.
The STEVAL-ISA008V1 demonstration board is a
28 W switch mode power supply which can be
used to supply an LCD monitor or even an LCDTV, with 15" or 17" panels and 2 lamps for
backlight together with multimedia functions such
as audio. The SMPS accepts a full range input
voltage (90 to 265 Vrms) and can deliver four
output voltages dedicated to the scaler (3.3 V), to
the mP (7 V), to the backlight and audio (12 V),
and to the TV tuner (35 V).
November 2010 Doc ID 18217 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Circuit schematic STEVAL-ISA008V1
1 Circuit schematic
Figure 1. Circuit schematic
AM03293v1
90-264Vrms
MOLEX 2
3K65-1%
R1
VDD
DRAIN
3
NTC_16R S236
7
5
C20
220PF-2KV
C15
47
uF-25V
R1
3
C4
68uF-400V
C18
10N
C19
15NF
C10
100N
U3
VIPER53_DIP
2
OSC
4
TOVL
1
COMP
3
SOURCE
4
SOURCE
R14
470R
STTH106
D6
220N
34
CON1
1
2
F1
FU
SE 2A
C3
1
20mH -
L2
SUMIDA
2
2
4
D4
DF06M
1
1N4148
D2
R12
1R5
6
4
3
1
2
1
2
TL431
U2
3
100N
C6
C5
RES
R2
Q1
BC547B
Q2
BC547B
R16
1K0
D3
1N4148
33K
R15
1K8
4K7-1%
R4
1K5-1%
RES
R7
R5
1K0
SFH617A-2
U1
RE
R6
S
R
3
C1
1N0-Y1
7
9
8
10
11
2200uF-6.3V YXF
100uF-25V YXF
180R
100N
C1
3
C14
R10
C9
CONN 8P
STPS3L60
D1
2.7
uH ELC08D
8
3.3V@1
470uF-16V YXF
C17
L1
RES
R9
100N
C
8
5
7
6
3.3V@1
7V@0.2
GND
STTH106
D5
1.5KE180A
D7
4
12
1000
D9
BYW100-200
uF-25V YXF
C11
1000uF-25V YXF
C12
R8
5K6
C7
100N
2
4
3
12V@2A
GND
GND
2
T1
24140011_D
C2
1N0-Y1
1
14
3
1N0
C16
STPS8H100CF
D
8
47R
R11
1
CON2
12V@2A
2/4 Doc ID 18217 Rev 1
A
A
A
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