STEVAL-ISA011V1 STMicroelectronics, STEVAL-ISA011V1 Datasheet - Page 2
![BOARD EVAL VIPER12A LP AC/DC](/photos/9/14/91478/steval-isa011v1_sml.jpg)
STEVAL-ISA011V1
Manufacturer Part Number
STEVAL-ISA011V1
Description
BOARD EVAL VIPER12A LP AC/DC
Manufacturer
STMicroelectronics
Series
VIPER™r
Type
AC/DC Switching Convertersr
Specifications of STEVAL-ISA011V1
Design Resources
STEVAL-ISA011V1 Gerber Files STEVAL-ISA011V1 Schematic STEVAL-ISA011V1 Bill of Materials
Main Purpose
AC/DC, Primary Side
Outputs And Type
1, Isolated
Power - Output
4.1W
Voltage - Output
4.5V
Current - Output
900mA
Voltage - Input
88 ~ 265VAC
Regulator Topology
Flyback
Frequency - Switching
60kHz
Board Type
Fully Populated
Utilized Ic / Part
VIPer12A
Input Voltage
88 V to 265 V
Output Voltage
4.5 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
VIPER12ADIP-E
Kit Application Type
Power Management - Voltage Regulator
Application Sub Type
AC / DC Adapter
Kit Contents
Board
Rohs Compliant
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
VIPer12A
Other names
497-6413
STEVAL-ISA011V1
STEVAL-ISA011V1
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
General circuit description
1
2/5
General circuit description
The circuit operates from 85Vac to 264Vac input voltage with an output power peak of 6W
through two output voltages of 5Vdc and 12Vdc. It contains an input fuse (F2), EMI filtering (C1,
L1, and C2), and the secondary regulation is provided by U2 and U3, the optocoupler and
TL431 respectively. For output filtering, the components used are the output capacitors C8 and
C10. These two output capacitors are sized according to the ripple current and ripple voltage
specifications. The two specifications determine the ESR and RMS current capabilities of the
capacitors used. An additional LC (PI) filter is added to the 5Vdc output, C9-L2 configuration,
for further effective ripple and noise rejection. The AC input is rectified and filtered by the bridge
BR1 and the bulk capacitor C1 to generate the high voltage DC bus applied to the primary
winding of the transformer, T1. The 5Vdc output is sensed with an optocoupler. It is possible to
modify the output voltages by changing the transformer turns ratio and modifying the resistance
values of R7 and R8 in the feedback loop. R2 and C4 form the snubber circuit needed to
reduce the voltage ringing on the drain pin and the leakage spikes.
STEVAL-ISA001V1