UCC15702

application INFO available Advanced Voltage Mode Pulse Width Modulator UCC15701/2 UCC25701/2 UCC35701/2 FEATURES DESCRIPTION 700kHz Operation Integrated Oscillator/ Voltage Feed Forward Compensation Accurate Duty Cycle Limit Accurate Volt-second Clamp Optocoupler Interface Fault Counting Shutdown Fault Latch off or Automatic Shutdown Soft Stop Optimized for Synchronous Rectification 1A Peak Gate Drive Output The UCC35701/UCC35702 family of pulse width modulators is intended for isolated switching power supplies using primary side control. They can be used for both off-line applications and DC/DC converter designs such as in a distributed power system architecture or as a telecom power source. The devices feature low startup current, allowing for efficient off-line starting, yet have sufficient output drive to switch power MOSFETs in excess of 500kHz. Voltage feed forward compensation is operational over a 5:1 input range and provides fast and accurate response to input voltage changes over a 4:1 range. An accurate volt-second clamp and maximum duty cycle limit are also featured. Fault protection is provided by pulse by pulse current limiting as well as the ability to latch off after a programmable number of repetitive faults has occurred. 130mA Start-up Current Two UVLO options are offered. UCC35701 family has turn-on and turn-off 750mA Operating Current thresholds of 13V/9V and UCC35702 family has thresholds of 9.6V/8.8V. The UCC35701/2 and the UCC25701/2 are offer...