NCV12711FLOATGEVB: NCV12711 EVB 12V/1A Primary side regulation without AUX winding

The evaluation board NCV12711FLOATGEVB is wide input range primary-side-regulated flyback converter without auxiliary winding for automotive applications capable deliver up to 12W (12V/1A) on its output.
The converter is built with the NCV12711 operated in current-mode control at 100 kHz. This control circuit offers many features to build an energy-efficient converter with all the needed protections like cycle-by-cycle current limit with a 250-mV sense voltage, over-current protection (OCP) and over-voltage protection (OVP) on the VCC pin.
The controller drives an N-channel MOSFET placed between the input voltage and the transformer to have primary side regulation directly from the primary winding.
Features and Applications


  • Internal 20-mA current source for lossless start-up sequence and self-supply operation
  • Smooth start-up sequence with frequency sweep
  • Internal operational amplifier with precise 2.5-V reference voltage
  • Current-mode control operation
  • Short circuit protection
  • Over voltage protection
  • Input Voltage UVLO with Hysteresis
  • Shutdown threshold for external disable
  • 0% duty ratio mode for low standby power
  • Single Resistor Programmable Oscillator
  • User-Adjustable Soft-Start Ramp
Evaluation/Development Tool Information
Product Status Compliance Short Description Parts Used Action
NCV12711 EVB 12V/1A Primary side regulation without AUX winding NCV12711ADNR2G
Technical Documents
Type Document Title Document ID/Size Rev
Eval Board: Manual A 12-V/1-A Isolated Flyback Converter with Primary Side Regulation without Auxiliary Winding for Automotive Applications Evaluation Board User's Manual EVBUM2845/D - 1189 KB  0 
Eval Board: BOM NCV12711FLOATGEVB Bill of Materials (ROHS Compliant) NCV12711FLOATGEVB_BOM_ROHS - 281 KB  0 
Eval Board: Gerber NCV12711FLOATGEVB Gerber Layout Files (Zip Format) NCV12711FLOATGEVB_GERBER - 85 KB  0 
Eval Board: Schematic NCV12711FLOATGEVB Schematic NCV12711FLOATGEVB_SCHEMATIC - 340 KB  1 
Eval Board: Test Procedure NCV12711FLOATGEVB Test Procedure NCV12711FLOATGEVB_TEST_PROCEDURE - 475 KB  0 
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