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STEVAL-ISA140V1
15W, 12V output, isolated flyback converter using VIPer™ Plus VIPER37HE
Data brief
Description
The STEVAL-ISA140V1 is a 15 W wide range
evaluation board based on the Viper37HE. It is
designed as an example of an isolated auxiliary
power supply.
The board and the transformer were designed
and optimized in order to have a very compact
size evaluation board.
Features
• AC Main Input voltage range: 100 VAC to
265 VAC
• Mains frequency (fL): 50 Hz / 60 Hz
• Output voltage typ: 12 V
• Output current: 1.25 A
• Output ripple voltage: 50 mV
• Rated output power: 15 W
• Input power in standby @230 VAC: 50 mW
• Active mode efficiency: 78%
• Ambient operating temperature: 60 °C
• RoHS compliant
November 2014
DocID025733 Rev 2
For further information contact your local STMicroelectronics sales office.
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Schematic diagram
1
STEVAL-ISA140V1
Schematic diagram
Figure 1. STEVAL-ISA140V1 circuit schematic
T1
L1
BR
RMB6S
C2
15uF
C3
15uF
D6
L2
STPS5H100UF
C4
1nF
R1
220k
12V-1.25A
3.3uH
C9
470uF
D1
STTH1L06A
C10
100uF
C11
1uF
2
3
-
+
1mH
D4
D3
BAT41ZFILM
BAT41ZFILM
R3
133K
4
1
CM
2X20mH
R12
2.2M
C1
220nF - X2
RV
R2
4.7
D2
BAT41ZFILM
VIPER37HE
C5
220pF
R5
220
F1
VDD
DRAIN
C6
33uF
R10
130k
R9
82k
CONTROL
CONT
2A
FB
AC IN
GND
C12
10nF
D5
18V
R4
30k
C8
33nF
R6
47k
IC2
TS432
C7
2.2nF
OPTO
SFH610A-2
C13
2.2nF
2/4
R8
12k
BR
320V
AC IN
OPTO
SFH610A-2
IC1
NTC
16
GND
R7
1k
DocID025733 Rev 2
R11
15k
STEVAL-ISA140V1
2
Revision history
Revision history
Table 1. Document revision history
Date
Revision
Changes
19-Dec-2013
1
Initial release.
14-Nov-2014
2
Title has been updated.
DocID025733 Rev 2
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4
STEVAL-ISA140V1
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acknowledgement.
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