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NCP1271
(Rev.:2006)

Soft−Skip Mode Standby PWM Controller with Adjustable Skip Level and External Latch

ON Semiconductor 

NCP1271

Soft−Skipt Mode Standby

PWM Controller with

Adjustable Skip Level and

External Latch

The NCP1271 represents a new, pin to pin compatible, generation

of the successful 7−pin current mode NCP12XX product series. The

controller allows for excellent stand by power consumption by use of

its adjustable Soft−Skip mode and integrated high voltage startup

FET. This proprietary Soft−Skip also dramatically reduces the risk of

acoustic noise. This allows the use of inexpensive transformers and

capacitors in the clamping network. Internal frequency jittering,

ramp compensation, timer−based fault detection and a latch input

make this controller an excellent candidate for converters where

ruggedness and component cost are the key constraints.

Features

• Fixed−Frequency Current−Mode Operation with Ramp

Compensation and Skip Cycle in Standby Condition

• Timer−Based Fault Protection for Improved Overload Detection

• “Soft−Skip Mode” Technique for Optimal Noise Control in Standby

• Internal High−Voltage Startup Current Source for Lossless Startup

• "5% Current Limit Accuracy over the Full Temperature Range

• Adjustable Skip Level

• Internal Latch for Easy Implementation of Overvoltage and

Overtemperature Protection

• Frequency Jittering for Softened EMI Signature

• +500 mA/−800 mA Peak Current Drive Capability

• Sub−100 mW Standby Power can be Achieved

• Pin−to−Pin Compatible with the Existing NCP120X Series

• This is a Pb−Free Device

Typical Applications

• AC−DC Adapters for Notebooks, LCD Monitors

• Offline Battery Chargers

• Consumer Electronic Appliances STB, DVD, DVDR

http://onsemi.com

SOIC−7

D SUFFIX

CASE 751U

MARKING

DIAGRAMS

8

1271x

ALYWG

G

1

x = A or B

A= 65 kHz

B= 100 kHz

A = Assembly Location

L = Wafer Lot

Y = Year

W = Work Week

G = Pb−Free Package

(Note: Microdot may be in either location)

PIN CONNECTIONS

Skip/latch 1

FB 2

CS 3

4

GND

SOIC−7

8 HV

6 VCC

5 Drv

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 18 of this data sheet.

*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. 2

Publication Order Number:

NCP1271/D

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