NCV12711PSRGEVB: EVB 12V/1A PSR primary side regulation

The evaluation board NCV12711PSRGEVB is wide input range primary-side-regulated flyback converter 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 as with any classical flyback converter at a user-adjustable switching frequency. The secondary side hosts a low-Vf diode for efficient rectification in continuous conduction mode (CCM).
Features and Applications


Features
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