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NCP1252

Current Mode PWM Controller for Forward and Flyback Applications

Unspecified 

NCP1252

Current Mode PWM

Controller for Forward and

Flyback Applications

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 SOIC8 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

• Power Supplies for PC Silver Boxes, Games Adapter...

• Flyback and Forward Converter

http://onsemi.com

OFFLINE CONTROLLER

8

1

SOIC−8

CASE 751

SUFFIX D

PDIP−8

CASE 626

SUFFIX P

PIN CONNECTIONS

FB

1

BO

CS

RT

SS

VCC

DRV

GND

(Top View)

MARKING DIAGRAMS

8

1252x

ALYWX

G

1

1252AP

AWL

YYWWG

x

= A, B or C Version

A

= Assembly Location

L, WL = Wafer Lot

Y, YY = Year

W, WW = Work Week

G or G = Pb−Free Package

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 16 of this data sheet.

© Semiconductor Components Industries, LLC, 2011

1

July, 2011 − Rev. 4

Publication Order Number:

NCP1252/D

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