UCC3570D

低功率脉冲宽度调制器 Low Power Pulse Width Modulator

DESCRIPON

The UCC1570 family of pulse width modulators is intended for application in isolated switching supplies using primary side control and a voltage mode feedback loop. Made with a BiCMOS process, these devices feature low startup current for efficient off-line starting with a bootstrapped low volt age supply. Operating current is also very low; yet these devices maintain the ability to drive a power MOSFET gate at frequencies above 500kHz.

FEATURES

•Low Power BiCMOS Process

•85µA Start-up Current

•1mA Run Current

•1A Peak Gate Drive Output

•Voltage Feed Forward

•Programmable Duty Cycle Clamp

•Optocoupler Interface

•500kHz Operation

•Soft Start

•Fault Counting Shutdown

•Fault Latch Off or Automatic Restart