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reference designNCP1252

Onsemi NCP1252

Current Mode PWM Controller for Forward and Flyback Applications

Overview

TopologyBoost Converter
Input voltage90-265 V
Switching frequency92-550 kHz
Output 1400 V
IC revision7

Description

The NCP1252 controller offers everything needed to build cost effective and reliable ac-dc switching supplies dedicated to ATX power supplies or any forward application. 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, the SOIC-8 package saves PCB space and represents a solution of choice in cost sensitive project.

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
  • Delayed Operation Upon Start−up via an Internal Fixed Timer
  • 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
  • Maximum 50% Duty Cycle: A Version
  • Maximum 80% Duty Cycle: B Version
  • Maximum 65% Duty Cycle: C Version
  • Ready for Updated No Load Regulation Specifications
  • SOIC−8 and PDIP−8 Packages
  • These are Pb−Free Devices

Typical applications

  • Flyback and Forward Converter, Power Supplies for PC Silver Boxes, Games Adapter...

More information

Products

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L(µH)
IR(A)
ISAT,10%(A)
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744732100
SPECWE-TI Radial Leaded Wire Wound Inductor, 10 µH, 4 A
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-TI Radial Leaded Wire Wound Inductor
Inductance10 µH
Rated Current4 A
Saturation Current @ 10%4.7 A
DC Resistance0.033 Ω
Self Resonant Frequency27 MHz
VersionHeat Shrinking Tube 
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750370081
SPECPFC Transformer WE-PFC, –, –
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Product series PFC Transformer WE-PFC
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750871014
SPECOffline Transformer WE-UNIT, –, –
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Product series Offline Transformer WE-UNIT
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750875731
SPECOffline Transformer WE-UNIT, –, –
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Product series Offline Transformer WE-UNIT
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