Datasheet > NCP1271

NCP1271

更新时间： 2024-09-18 04:11:35

品牌	Logo	应用领域
安森美 - ONSEMI		锁存器控制器
页数	文件大小	规格书
19页	151K
描述
Soft−Skip Mode Standby PWM Controller with Adjustable Skip Level and External Latch

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NCP1271 数据手册

NCP1271

Soft−Skipt Mode Standby

PWM Controller with

Adjustable Skip Level and

External Latch

http://onsemi.com

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.

MARKING

DIAGRAMS

SOIC−7

D SUFFIX

CASE 751U

1271x

ALYWG

= A or B

A= 65 kHz

B= 100 kHz

Features

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb−Free Package

• 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

(Note: Microdot may be in either location)

PIN CONNECTIONS

SOIC−7

Skip/latch

Drv

GND

(Top View)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

Typical Applications

• AC−DC Adapters for Notebooks, LCD Monitors

• Offline Battery Chargers

• Consumer Electronic Appliances STB, DVD, DVDR

dimensions section on page 18 of this data sheet.

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

downloadthe ON Semiconductor Soldering and Mounting Techniques Reference

Manual, SOLDERRM/D.

Semiconductor Components Industries, LLC, 2006

Publication Order Number:

December, 2006 − Rev. 2

NCP1271/D

12 3 4 5 6 7...19

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