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NCP1282

High Performance Active Clamp/Reset PWM Controller Featuring 500 V Startup

ON Semiconductor 

NCP1282

High Performance Active

Clamp/Reset PWM Controller

Featuring 500 V Startup

The NCP1282 is a voltage mode controller designed for ac−dc or

dc−dc converters requiring high−efficiency and low parts count. This

controller incorporates two in phase outputs with an overlap delay to

prevent simultaneous conduction and facilitates soft switching. The

main output is designed for driving a forward converter primary

MOSFET. The secondary output is designed for driving an active

clamp circuit MOSFET, a synchronous rectifier on the secondary

side, or an asymmetric half bridge circuit.

The NCP1282 reduces component count and system size by

incorporating high accuracy on critical specifications such as

maximum duty cycle limit, undervoltage detector and overcurrent

threshold. Two distinctive features of the NCP1282 are soft−stop and

a cycle skip current limit with a time threshold. Soft−stop circuitry

powers down the converter in a controlled manner if a severe fault is

detected. The cycle skip detector enables a soft−stop sequence if a

continuous overcurrent condition is present.

Additional features found in the NCP1282 include line feed−

forward, frequency synchronization up to 1.0 MHz, cycle−by−cycle

current limit with leading edge blanking (LEB), independent under

and overvoltage detectors, adjustable output overlap delay,

programmable maximum duty cycle, internal startup circuit and

soft−start.

http://onsemi.com

MARKING

DIAGRAM

SO−16

D SUFFIX

CASE 751B

NCP1282BG

AWLYWW

A

= Assembly Location

WL, L = Wafer Lot

Y

= Year

WW, W = Work Week

G

= Pb−Free Package

ORDERING INFORMATION

Device

Package

Shipping†

NCP1282BDR2G 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.

Features

• Dual Control Outputs with Adjustable Overlap Delay

• >2.0 A Output Drive Capability

• Soft−Stop Powers Down Converter in a Controlled

Manner

• Cycle−by−Cycle Current Limit

• Cycle Skip Initiated if Continuous Current Limit

Condition Exists

• Voltage Mode Operation with Input Voltage

Feedforward

• Fixed Frequency Operation up to 1.0 MHz

• Bidirectional Frequency Synchronization

• Independent Line Undervoltage and Overvoltage

Detectors

• Minimum Operating Voltage of 8.5 V Ensures Enough

Voltage is Available for Driving High Voltage MOSFETs

• Accurate Programmable Maximum Duty Cycle Limit

• Programmable Maximum Volt−Second Product

• Programmable Soft−Start

• Internal 500 V Startup Circuit

• Precision 5.0 V Reference

• This is a Pb−Free Device*

Typical Applications

• High Power Consumer Electronics

• High Power AC−DC Converters

• High Power DC−DC Converters

• ATX Power Supplies

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

download the ON Semiconductor Soldering and Mounting Techniques Reference

Manual, SOLDERRM/D.

© Semiconductor Components Industries, LLC, 2006

1

December, 2006 − Rev. 0

Publication Order Number:

NCP1282/D

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