NCP1271 datasheet(1/19 Pages) ONSEMI

Part #	NCP1271

Description	Soft?뭆kip Mode Standby PWM Controller with Adjustable Skip Level and External Latch

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Manufacturer	ONSEMI [ON Semiconductor]

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September, 2009 − Rev. 6

1

Publication Order Number:

NCP1271/D

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

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

download the ON Semiconductor Soldering and Mounting Techniques Reference

Manual, SOLDERRM/D.

PIN CONNECTIONS

http://onsemi.com

MARKING

DIAGRAMS

(Top View)

1271x

ALYWG

G

x

= A or B

A= 65 kHz

B= 100 kHz

xxx

= Device Code: 65, 100

A

= Assembly Location

L, WL = Wafer Lot

Y, YY

= Year

W, WW = Work Week

G or G = Pb−Free Package

1

8

(Note: Microdot may be in either location)

Skip/latch

FB

CS

GND

1

2

3

4

HV

VCC

Drv

8

6

5

SOIC−7

D SUFFIX

CASE 751U

See detailed ordering and shipping information in the package

dimensions section on page 19 of this data sheet.

ORDERING INFORMATION

PDIP−7 VHVIC

P SUFFIX

CASE 626B

1

8

1271Pxxx

AWL

YYWWG

1

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