NCP1032 datasheet(1/21 Pages) ONSEMI

Part #	NCP1032

Description	Low Power PWM Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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May, 2014 − Rev. 2

1

Publication Order Number:

NCP1032/D

NCP1032

Low Power PWM Controller

with On-Chip Power Switch

and Startup Circuits for

Telecom Systems

The NCP1032 is a miniature high−voltage monolithic switching

converter with on−chip power switch and startup circuits. It

incorporates in a single IC all the active power control logic and

protection circuitry required to implement, with minimal external

components several switching regulator applications, such as a

secondary side bias supply or a low power DC−DC converter. This

converter is ideally suited for 24 V and 48 V telecom and medical

isolated power supply applications. The NCP1032 can be configured

in any single−ended topology such as forward or flyback converter.

The NCP1032 is targeted for applications requiring up to 3 W.

The internal error amplifier allows the NCP1032 to be easily

configured for secondary or primary side regulation operation in

isolated and non−isolated configurations. The fixed frequency

oscillator is optimized for operation up to 1 MHz and is capable of

external frequency synchronization, providing additional design

flexibility. In addition, the NCP1032 incorporates undervoltage and

overvoltage line detectors, programmable cycle−by−cycle current

limit, internal soft−start, and thermal shutdown to protect the

controller under fault conditions.

Features

• On Chip High 200 V Power Switch Circuit and Startup Circuit

• Internal Startup Regulator with Auxiliary Winding Override

• Programmable Oscillator Frequency Operation up to 1 MHz

• External Frequency Synchronization Capability

• Frequency Fold−down Under Fault Conditions

• Trimmed ± 2% Internal Reference

• Programmable Cycle−by−Cycle Current Limit

• Internal Soft−Start

• Active Leading Edge Blanking Circuit

• Line Under and Over Voltage Protection

• Over Temperature Protection

• These are Pb−Free Devices

Typical Applications

• POE (Power Over Ethernet)/PD. Refer to Application Note AND8247

• Secondary Side Bias Supply for Isolated DC−DC Converters

• Stand Alone Low Power DC−DC Converter

• Low Power Bias Supply

• Low Power Boost Converter

• Medical Isolated Power Supplies

• Bias Supply for Telecom Systems. Refer to App Note AND8119/D

http://onsemi.com

MARKING

DIAGRAMS

1032 = Specific Device Marking

x

= A or B

A = Assembly Location

L

= Wafer Lot

Y = Year

W = Work Week

G = Pb−Free Package

PIN CONNECTIONS

(Note: Microdot may be in either location)

See detailed ordering and shipping information in the package

dimensions section on page 20 of this data sheet.

ORDERING INFORMATION

WDFN8

MN SUFFIX

CASE 511BH

1032x

ALYW

G

WDFN8 (Top View)

GND

CT

VFB

COMP

VCC

VDRAIN

CL

UV/OV

1

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