AN4129
Description
This application note describes the operation and features of the FAN7601. This device is a BCDMOS programmable frequency current mode PWM controller which is designed for off-line adapter applications and auxiliary power supplies.
Key Features
- Start-up circuit and reference
- Oscillator
- Soft start and latch
- Current sense and feed back
- Burst mode
- Output drive Vref 8 Vstr 1 7 Vcc 5V Ref Enable Start-up Circuit UVLO OVP + - 19V Rt/Ct 4 OSC Vref 12uA S Q R + - 12V/8V Latch/SS 3
- 5V OVP 6 OUT + -
- 5V S Q R Delay Circuit + -
- 97V/0.9V 2 CS/FB 1V GND 5 + - Start-up Circuit Reset Circuit + - - Latch/SS 1V Figure
- Internal Block Diagram of the FAN7601 Rev. 1.0.1 ©2003 Fairchild Semiconductor Corporation DataSheet 4 U .com AN4129
