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NCP1560

Full Featured Voltage Mode PWM Controller

ON Semiconductor 

NCP1560

Full Featured Voltage Mode

PWM Controller

The NCP1560 PWM controller contains all the features and

flexibility needed to implement voltage−mode control in high

performance single ended DC−DC converters. This device cost

effectively reduces system part count with the inclusion of a high

voltage startup regulator that operates over a wide input range of

21.5 V to 150 V. The NCP1560 provides two control outputs, OUT1

which controls the main PWM switch and OUT2 with adjustable

overlap delay, which can control a synchronous rectifier switch or an

active clamp/reset switch. Other distinctive features include: two

mode over current protection, line under/overvoltage lockout, fast line

feedforward, soft−start and a maximum duty cycle limit.

Features

• Minimum Operating Voltage of 21.5 V

• Internal High Voltage Startup Regulator

• Dual Control Outputs with Adjustable Overlap Delay

• Single Resistor Oscillator Frequency Setting

• Fast Line Feedforward

• Line Under/Overvoltage Lockout

• Dual Mode Overcurrent Protection

• Programmable Maximum Duty Cycle Control

• Maximum Duty Cycle Proportional to Line Voltage

• Programmable Soft−Start

• Precision 5.0 V Reference

• Pb−Free Package is Available*

Typical Applications

• Telecommunication Power Converters

• Industrial Power Converters

• High Voltage Power Modules

• +42 V Automotive Systems

• Control Driven Synchronous Rectifier Power Converters

*For additional information on our Pb−Free strategy and soldering details, please

download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

TX

http://onsemi.com

MARKING DIAGRAM

16

16

1

SO−16

D SUFFIX

CASE 751B

NCP1560

AWLYWW

1

NCP1560 = Device Code

A

= Assembly Location

WL

= Wafer Lot

Y

= Year

WW

= Work Week

PIN CONNECTIONS

1

Vin

UV/OV

16

VAUX

OUT1

NC

GND

FF

OUT2

CS

CSKIP

tD

VREF

RT

VEA

DCMAX

SS

ORDERING INFORMATION

Device

Package

Shipping†

NCP1560HDR2 SO−16 2500/Tape & Reel

NCP1560HDR2G SO−16 2500/Tape & Reel

(Pb−Free)

†For information on tape and reel specifications,

including part orientation and tape sizes, please

refer to our Tape and Reel Packaging Specifications

Brochure, BRD8011/D.

Lout

+

Vin

−

Startup

Feedforward

SR

Drive

+

Cout

Vout

−

Vin FF

NCP1560

UV/OV

OUT1

OUT2

Overlap tD

Delay

Driver

M1

Cclamp

Mclamp

Opto

Figure 1. Active−Clamp Forward Converter

Error

Amplifier

© Semiconductor Components Industries, LLC, 2006

1

July, 2006 − Rev. 7

Publication Order Number

NCP1560/D

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