STEVAL-ISA002V1 STMicroelectronics, STEVAL-ISA002V1 Datasheet - Page 2

• Manufacturer Part Number: STEVAL-ISA002V1
• Description: BOARD 6W SINGLE OUTPUT VIPER12A
• Manufacturer: STMicroelectronics
• Series: VIPER™r
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA002V1

• Mfg Application Notes: VIPer12A Single Output - AppNote AN1734
• Design Resources: STEVAL-ISA002V1 Gerber Files STEVAL-ISA002V1 Schematic STEVAL-ISA002V1 Bill of Materials
• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 1, Isolated
• Power - Output: 6W
• Voltage - Output: 12V
• Current - Output: 500mA
• Voltage - Input: 85 ~ 264VAC
• Regulator Topology: Flyback
• Frequency - Switching: 60kHz
• Board Type: Fully Populated
• Utilized Ic / Part: VIPer12A
• Input Voltage: 85 V to 264 V
• Output Voltage: 12 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: VIPer12A
• Other names: 497-4930

General circuit description
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General circuit description
This evaluation board is designed as a discontinuous flyback regulator delivering 0.5A at
12V. The AC input is rectified and filtered by the bridge BR1, the bulk capacitor C1, and C2
to generate the high voltage DC bus applied to the primary winding (pins 8-10) of the
transformer, TR1. C1, L1, and C2 provide EMI filtering for the circuit. R2 and C3 form the
snubber circuit needed to reduce the leakage spike and voltage ringing on the drain pin of
VIPer12A. The output voltage is regulated with a TL431 (U3) via an optocoupler (U2) to the
feedback pin. The output voltage ripple is controlled with the capacitor, C7, with an
additional LC PI filter configuration made up of L4 and C8. It is possible to modify the output
voltages by changing the transformer turns ratio and modifying the resistance values of R6
and R7 in the feedback loop.
STEVAL-ISA002V1