AN3101 is a high-performance PWM controller designed for offline flyback power supply. The chip integrates universal primary constant current control technology, which can support intermittent and continuous mode operation, suitable for isolated power supply applications with constant current output.AN3101 has a high-precision 65kHz switching frequency oscillator inside, and has a frequency jitter function to optimize EMI performance. The chip operates in green energy-saving mode and burp mode, which can achieve standby power consumption of less than 75mW. AN3101 integrates complete protection functions, including VDD undervoltage protection (UVLO), VDD overvoltage protection (OVP), cycle by cycle current limit, short circuit protection (SCP), overload protection (OLP), overheating protection, soft start, VDD clamping, and CS pin open circuit protection.
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Primary Side Constant-Current (CC)

Control for DCM and CCM Operation

Standby Power below 75mW

Green Mode and Burst Mode Control

±5% CC Regulation; ±1% CV Regulation

65KHz Switching Frequency

Under-Voltage Lockout (UVLO)

Built-in Line & Inductance

Compensation for CC Operation

Over Load Protection (OLP)

Short circuit protection (SCP)

VDD Over Voltage Protection (OVP)

Cycle-by-Cycle Current Limiting

On Chip OTP Protection

CS Pin Float Protection

Leading Edge Blanking (LEB)


Switching AC/DC power


SMPS Power Supply