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NCP1252 - PWM Controller

Description

This pin directly connects to an optocoupler collector.

out protection.

Monitors the primary current and allows the selection of the ramp compensation amplitude.

A resistor connected to ground fixes the switching frequency.

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.

📥 Download Datasheet

Datasheet Details

Part number NCP1252
Manufacturer onsemi
File Size 385.66 KB
Description PWM Controller
Datasheet download datasheet NCP1252 Datasheet

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Full PDF Text Transcription

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Current Mode PWM Controller for Forward and Flyback Applications NCP1252 The NCP1252 controller offers everything needed to build cost− effective and reliable ac−dc switching supplies dedicated to ATX power supplies. Thanks to the use of an internally fixed timer, NCP1252 detects an output overload without relying on the auxiliary Vcc. A Brown−Out input offers protection against low input voltages and improves the converter safety. Finally a SOIC−8 package saves PCB space and represents a solution of choice in cost sensitive project.
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