STEVAL-ISA029V1
Compact power supply for DVD/set-top box demonstration board
with three V
Features
■ Input voltage range: 85 V
■
V
= 12 V (±5%)
OUT1
■ I
■ V
■ I
■ V
■ I
■ Safety EN60950 compliant
■ EMI - conducted EN55022-B compliant
= 1 A
OUT1
= 3.3 V (±2%)
OUT2
= 100 mA
OUT2
= -24 V (±10%)
OUT3
= 40 mA
OUT3
Description
The STEVAL-ISA029V1 demonstration board is
an isolated triple-output flyback converter, suitable
for wide-range input voltage operation. The
converter is based on the smart power VIPer53-E
which, in a single package, integrates an
enhanced current-mode PWM controller and a
high-voltage MDmesh™ power MOSFET. The
switching frequency is set to 60 kHz by means of
an external RC network connected to a dedicated
pin on the IC. The closed loop regulation is
performed on the 12 V output using an
optocoupler, which drives the COMP pin of the
VIPer53-E. The 3.3 V output is post-regulated
using a non-integrated low drop linear voltage
regulator to achieve the required accuracy. The
negative 24 V output is achieved by means of a
discrete linear voltage regulator, made up of a
Zener diode, a resistor and a PNP transistor.
– 300 V
AC
AC
(-30 V, +3.3 V, +12 V)
out
STEVAL-ISA029V1
Data Brief
September 2008 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Board schematic STEVAL-ISA029V1
1 Board schematic
Figure 1. Schematic diagram
J2
1234567
+3.3V
4.7u
4.7u
U1
5
LK112M33TRU1LK112M33TR
-24V
100n
100n
C16
Come transistore di potenza:
BD140
BSS44
Q1
C12
C12
C16
D8
BD140Q1BD140
R11
R11
820
820
ZENER 24VD8ZENER 24V
22u
22u
COUT1
COUT1
D1 STTH102D1 STTH102
8
T1
1
2.2n
2.2n
D3
CON7J2CON7
C15
C15
100nC5100n
C5
3 4
2
1
COUT2
COUT2
330u
330u
R12
330
R12
330
R15
180 1W
R15
180 1W
+12V
D4 STTH102D4 STTH102
R10
4.7k
R10
R7
18kR718k
C10
68n
C10
COUT3
COUT3
1500u
1500u
100n - NM
100n - NM
C14
C14
D6 STPS2H100D6 STPS2H100
657
2
3
TRANSFORMERT1TRANSFORMER
4
R61kR6
R51kR5
1k
U5
68n
N.M.
N.M.
C13
C13
R9
47kR947k
1k
PC817BU5PC817B
4.7k
1
2 3
U4
TL431U4TL431
TRANSIL - N.M.D3TRANSIL - N.M.
C4
4.7n 400VC44.7n 400V
R1
15k 2WR115k 2W
D2
D2
3
DIODE BRIDGE
DIODE BRIDGE
1
L1
F1
FUSEF1FUSE
J1
C3C3
47u 400V
2
- +
- +
4
C2
100n 400VC2100n 400V
2 3
10mHL110mH
1 4
C1
RT1
100n 400VC1100n 400V
1 2
1
2
CON2J1CON2
D7
D5
STTH110D5STTH110
t
50tRT1
50
2/4
STPS1150D7STPS1150
100nC7100n
R210R2
C7
10
1k
R41kR4
6
5
8
7
N.C.
VDD
TOVL
DRAIN
VIPER53U2VIPER53
SOURCE
COMP
OSC2SOURCE
U2
3
4
1
4.7nC84.7n
R3
5.6kR35.6k
C6
C8
22uC622u
D9
STTH110D9STTH110
2.2n 1kV
2.2n 1kV
C17
R13
R13
C9
R8
2.2kR82.2k
C17
470
470
10nC910n
100n
100n
C11
C11
STEVAL-ISA029V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
02-Sep-2008 1 Initial release.
3/4
STEVAL-ISA029V1
y
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