NCP1377B

更新时间： 2024-11-09 22:54:31

品牌	Logo	应用领域
安森美 - ONSEMI		控制器
页数	文件大小	规格书
16页	169K
描述
PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation

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NCP1377B 数据手册

NCP1377, NCP1377B

PWM Current−Mode

Controller for Free−Running

Quasi−Resonant Operation

The NCP1377 combines a true current mode modulator and a

demagnetization detector which ensures full borderline/critical

Conduction Mode in any load/line conditions together with

minimum drain voltage switching (Quasi−Resonant operation). Due

to its inherent skip cycle capability, the controller enters burst mode

as soon as the power demand falls below a predetermined level. As

this happens at low peak current, no audible noise can be heard. For

NCP1377, an internal 8.0 ms timer prevents the free−run frequency to

exceed 100 kHz (therefore below the 150 kHz CISPR−22 EMI

starting limit), while the skip adjustment capability lets the user

select the frequency at which the burst foldback takes place. For

NC1377B, the internal timer duration is reduced to 3.0 ms to allow

operation at higher frequencies (up to 300 kHz).

http://onsemi.com

MARKING DIAGRAMS

SOIC−8

D SUFFIX

CASE 751

1377

ALYW

1377B

ALYW

PDIP−7

P SUFFIX

CASE 626B

The transformer core reset detection is done through an auxiliary

winding which, brought via a dedicated pin, also enables fast

Over Voltage Protection (OVP). Once an OVP has been detected, the

IC permanently latches off. The 1377 features a sampling time of

4.5 ms whereas it is 1.5 ms for the B version.

1377P

AWL

1377BP

AWL

YYWW

The NCP1377 also features an efficient protective circuitries

which, in presence of an overcurrent condition, disables the output

pulses and enters a safe burst mode, trying to restart. Once the default

has gone, the device auto−recovers. Finally an internal 1.0 ms

Soft−Start eliminates the traditional startup stress.

= Assembly Location

WL, L = Wafer Lot

YY, Y = Year

WW, W = Work Week

Features

PIN CONNECTIONS

• Pb−Free Package is Available

• Free−Running Borderline/Critical Mode Quasi−Resonant Operation

• Latched Overvoltage Protection

• Auto−Recovery Short−Circuit Protection Via UVLO Crossover

• External Latch Triggering, e.g. Via Overtemperature Signal

• Current−Mode with Adjustable Skip Cycle Capability

• Internal 1.0 ms Soft−Start

Dmg

GND

Drv

(Top View)

• Internal Temperature Shutdown

• Internal Leading Edge Blanking

ORDERING INFORMATION

• 500 mA Peak Current Source/Sink Capability

• Under Voltage Lockout Level of 12.5 V (On) and 7.5 V (Min)

• Direct Optocoupler Connection

†

Device

Package

Shipping

NCP1377DR2

SOIC−8

2500 Tape & Reel

NCP1377DR2G

SOIC−8

(Pb−Free)

• SPICE Models Available for TRANsient Analysis

• Internal Minimum T

OFF

NCP1377BDR2

NCP1377P

SOIC−8

PDIP−7

2500 Tape & Reel

50 Units/Tube

Typical Applications

NCP1377BP

• AC−DC Adapters for Notebooks, etc.

• Offline Battery Chargers

• Consumer Electronics (DVD Players, Set−Top Boxes, TVs, etc.)

• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)

†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.

Semiconductor Components Industries, LLC, 2004

Publication Order Number:

October, 2004 − Rev. 1

NCP1377/D

12 3 4 5 6 7...16

中文翻译

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与NCP1377B相关器件

型号	品牌	获取价格	描述	数据表
NCP1377BD1R2G	ONSEMI	获取价格	PWM Current−Mode Controller for Free−Running Quasi−Resonant Operation
NCP1377BDR2	ONSEMI	获取价格	PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
NCP1377BDR2G	ONSEMI	获取价格	PWM Current−Mode Controller for Free−Running Quasi−Resonant Operation
NCP1377BP	ONSEMI	获取价格	PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
NCP1377BPG	ONSEMI	获取价格	PWM Current−Mode Controller for Free−Running Quasi−Resonant Operation
NCP1377D1R2G	ONSEMI	获取价格	PWM Current−Mode Controller for Free−Running Quasi−Resonant Operation
NCP1377DR2	ONSEMI	获取价格	PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
NCP1377DR2G	ONSEMI	获取价格	PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
NCP1377P	ONSEMI	获取价格	PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
NCP1377PG	ONSEMI	获取价格	PWM Current−Mode Controller for Free−Running Quasi−Resonant Operation

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