1. DESCRIPTION

The DK125 is a secondary side fly-back type AC-DC Switch Mode Power Controlling IC. Designed with high

integration CMOS circuit, it has protection functions for short circuit, secondary side open circuit, over

temperature, over voltage and so on. With built-in HV power transistor and patented Self-Power supply circuit, it

has the characteristics of saving external components, simple transformer design with only two windings in

isolated output circuit, etc.

2. APPLICATIONS

·Battery charger ·DVD/VCD/VCR power supply

·Power AC/DC adapters ·Air conditioner power supply

·STB power supply ·LED driver applications

·Electromagnetic oven power supply ·TV/Monitor power supply

3. MAIN FEATURES

·90V—265V wide range AC power input.

·Built-in 700V HV BJT

·Internal integrated high voltage starting circuit, no need for additional resistance

·Burst mode (22kHz Intermittent operation mode)

·Standby power consumption < 0.3W

·65KHz PWM switching frequency

·4KV ESD

·Internal power compensation circuit to keep the stability of output in different input situation

·Patented self-power supply design, no need for auxiliary winding in transformer

·Internal frequency modulation circuit to reduce EMI filter cost

·Over current, Over temperature, Over voltage, Output open circuit and Short circuit Protection