ST ISA031V1 User Manual
Demonstration board for 40 W auxiliary 3-phase power supply
Features
■ Input voltage range: 185 Vac to 460 Vac
■ Input frequency range: 50/60 Hz
■ Output voltage V
■ Output voltage V
■ Total output power 40 W
■ Safety: EN60950
■ EMI: EN55014
= 24 V @ I
out1
= 5 V @ I
out2
out1
out2
= 1.7 A
= 1 A
STEVAL-ISA031V1
based on the L6565 and STW4N150
Data Brief
Description
This demonstration board introduces a solution
for industrial power supplies fed by a 3-phase
mains supply. It takes advantage of the high
voltage MOSFET (1500 V breakdown voltage) to
optimize the operation of the quasi-resonant
flyback converter based on the primary controller
L6565. The demonstration board has been
designed and developed to address low power
applications. The board features two outputs,
24 V and 5 V, and is able to deliver more than 40
W. The 5 V output is obtained using an integrated
DC-DC converter based on L5970AD, connected
on the 24 V output.
STEVAL-ISA031V1
November 2008 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Circuit schematic STEVAL-ISA031V1
1 Circuit schematic
Figure 1. Schematic
C20
C20
10uF/35V
5V/1A
24V/1.7A
J6
J6
CON3_0
CON3_0
3
1
2
R22
nc
R22
nc
C16
C16
22u/35V
22u/35V
L5 10uH
L5 10uH
C15
220u/35V
C15
220u/35V
D9 STPS5 H100
D9 STPS5 H100
8
14
T1
T1
7
R10
R10
TRANSFORMER
TRANSFORMER
3
1
2
D5
D5
STTH108
STTH108
D6
D6
STTH108
C5
STTH108
C5
3.3n/2kV
3.3n/2kV
R12 16R
R12 16R
Q11 nc
Q11 nc
R11
150K/2W
R11
150K/2W
150K/2W
150K/2W
D7
D7
R8
330k
R8
330k
R9
330k
R9
330k
10uF/35V
8
7
6
5
FB
VCC
GND
VREF
COMP
SYNC
OUT
INH
U4 L5970AD
U4 L5970AD
L6 15uH
L6 15uH
C13
C13
C19
220p
C19
220p
4
2
1
3
C18
22n
C18
22n
R25
4k7
R25
4k7
D10
STPS2L25U
D10
STPS2L25U
R24
R24
3k9
3k9
R23
12k
R23
12k
+
+
C17
C17
220uF/10V
220uF/10V
HS 12 C/W
nc
nc
C12
C12
R21
2R2
R21
2R2
R20
2R2
R20
2R2
STP4N150
STP4N150
M1
M1
3
2
1
6.8n - nc
6.8n - nc
R13
R13
1N4148
1N4148
1k
1k
R19
R19
2.2k- nc
2.2k- nc
2.2
2.2
R18
R18
C11
C11
C10
R17 56k
R17 56k
C10
R28
10k - 1%
R28
10k - 1%
C22 22n
C22 22n
C21 nc
C21 nc
C23
C23
5k6
5k6
R29
R29
R26
2k2
R26
2k2
470p
470p
C14
C14
2.2n - Y1
47u
47u
2.2n - Y1
R30
1.2k - 1%
R30
1.2k - 1%
n.c.
n.c.
3
U5
TL431
U5
TL431
1
2
R27
3k3
R27
3k3
U2
U2
PC817
PC817
NTC1
NTC1
480-650VDC
8
7
6
5
D8
1N4148
D8
1N4148
100n
100n
C8
GD
ZCD
VCC
GND
U1
U1
CS
COMP
INV
R7
1.8M
R7
1.8M
R6
1.8M
R6
1.8M
R5
1.8M
R5
1.8M
R3
R1
1M
R1
1M
C1
C1
50E
50E
R3
R2
1M
R2
1M
+
+
22uF/450V
22uF/450V
10n-X2
10n-X2
C4
C4
3
L4
L4
4
C3
C3
D2
1N4007
D2
1N4007
C
A
D1
1N4007
D1
1N4007
C
A
L2 1mH
L2 1mH
L1 1mH
L1 1mH
F1 1A
F1 1A
2
1
400Vac
CON1
400Vac
CON1
VFF
4
2
1
3
R14
R14
C6
C6
1M
1M
R4
1M
R4
1M
C2
C2
+
+
22uF/450V
22uF/450V
2
27 mH
27 mH
1
10n-X2
10n-X2
D4
1N4007
D4
1N4007
C
A
D3
1N4007
D3
1N4007
C
A
2
1
230Vac
CON2
230Vac
CON2
C8
L6565
L6565
120k
120k
R16
R16
R15
R15
18k
18k
1n
1n
C7
C7
L3 1mH
L3 1mH
2.2n
2.2n
C9
C9
27k
27k
2.2n
2.2n
2/4
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