The AP3700E is a green-mode pulse width modulation (PWM) controller. It is specially designed for low power applications such as off-line battery chargers, where the needs for low standby power, space saving and low cost are all required. In a battery charger rated 5V/0.8A, the maximum standby power is only 0.18Watt. In normal operation, the AP3700E switches on and off at a fixed switching frequency of 60 kHz. With a cur- rent limit capability of 460mA, the AP3700E can directly drive the emitter of high voltage NPN transis- tor. When output power falls below a given level, the IC enters skip cycle mode to reduce power consump- tion. The AP3700E also features under-voltage lockout, over-current and short circuit protections. The AP3700E is available in TO-92 package.