STEVAL-ISA006V1 STMicroelectronics, STEVAL-ISA006V1 Datasheet - Page 2

• Manufacturer Part Number: STEVAL-ISA006V1
• Description: EVAL BOARD FLYBACK PWR SUPPLY 6W
• Manufacturer: STMicroelectronics
• Series: VIPER™r
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of STEVAL-ISA006V1

• Mfg Application Notes: VIPer12A Non-Isolated Flyback Converter
• Design Resources: STEVAL-ISA006V1 Gerber Files STEVAL-ISA006V1 Schematic STEVAL-ISA006V1 Bill of Materials
• Main Purpose: AC/DC, Non-Isolated
• Outputs And Type: 2, Non-Isolated
• Power - Output: 5.5W
• Voltage - Output: 5V, 15V
• Current - Output: 500mA, 200mA
• Voltage - Input: 90 ~ 264VAC
• Regulator Topology: Flyback
• Frequency - Switching: 60kHz
• Board Type: Fully Populated
• Utilized Ic / Part: VIPer12A
• Input Voltage: 90 V to 264 V
• Output Voltage: 5 V, 15 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: VIPer12AS
• Kit Application Type: Power Management
• Application Sub Type: Power Supply
• Kit Contents: Board
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: VIPer12AS
• Other names: 497-5082

General circuit description
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General circuit description
The output of the converter is not isolated from the input. For this reason the reference ground
is common for an input and output connection terminal. The input capacitor C1 is charged from
the mains by single rectification consisting of diodes D1 and D2. Two diodes in series are used
for EMI reasons to sustain burst pulses of 2kV. Capacitor C1 together with capacitor C2 and
inductor L1 form an EMI filter. The DC voltage at C2 is then applied to the transformer primary
winding through the internal Power MOSFET switch of VIPer12 during the switching period ON
time. The snubber circuit consisting of resistor R3 and capacitor C6 reduces the voltage spike
across the transformer primary winding due to the parasitic leakage inductance. Through
rectifiers D4 and D5 and through smoothing capacitors C3 and C4, the power supply provides
two outputs from two transformer windings. The VIPer12AS is supplied by a 15V output voltage
through transistor Q2 and diode D7. The voltage feedback loop senses the 5V output through
resistor divider R5, R7. The control IC U2 compares the resistor divider output voltage to the
internal reference voltage of 2.5V and changes the cathode voltage accordingly to keep 5V
output stable. The FB pin current will decrease the peak primary current to reduce the power
delivered to the outputs.
STEVAL-ISA006V1