NCP1252 - ON Semiconductor

NCP1252 PWM Controller

This pin directly connects to an optocoupler collector. This pin monitors the input voltage image to offer a Brown−out protection. Monitors the primary current and allows the selection of the ramp compensation amplitude. A resistor connected to ground fixes the switching frequency. The controller ground pin. This pin connects to the MOSFET gate This pin acce.

Features

 Peak Current Mode Control
 Adjustable Switching Frequency up to 500 kHz
 Jittering Frequency 5% of the Switching Frequency
 Latched Primary Over Current Protection with 10 ms Fixed Delay
 Delay Extended to 150 ms in E Version
 Delayed Operation Upon Start−up via an Internal Fixed Timer (A, B and C versions only)
 Adjustable Soft−start Timer
 Auto−recovery Brown−Out Detection
 UC384X−like UVLO Thresholds
 Vcc Range from 9 V to 28 V with Auto−recovery UVLO
 Internal 160 ns Leading Edge Blanking
 Adjustable Internal Ramp Compensation
 +500 mA /
  –800 mA Source / Sink Capability
 Ma.