AP3720 Description
The AP3720 is a low startup current, current mode PWM controller with green-mode operation. The PWM switching frequency at normal operation is 65k, but when the output power drops below the specifically level, the device enters the frequency-drop mode and the typical operating frequency is 20kHz (no audible noise). Additionally, when the load drops to a very low level or zero, the IC operates in so called ‘burst...
AP3720 Key Features
- Low Startup Current (2.5µA) and Low Operating Current (1.2mA)
- Off-line Converter Applied in Sub 25W Range
- Skip Cycle Mode Achieves Low Standby Power
- Cycle-by-Cycle Power Limited
- Frequency-drop Mode
- Soft Start with 2ms
- Programmable Drive Current for BJT
- Leading Edge Blanking
- Pre-shutdown Decreases Turn-off Losses
- Reliable Protection