NCP1378

更新时间： 2024-11-28 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	155K
描述
PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation

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NCP1378 数据手册

NCP1378

PWM Current−Mode

Controller for Free−Running

Quasi−Resonant Operation

The NCP1378 combines a true current mode modulator and

a demagnetization detector to ensure full borderline/critical

Conduction Mode in any load/line conditions and 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. 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.

http://onsemi.com

MARKING

DIAGRAMS

SOIC−8

D SUFFIX

CASE 751

1378

ALYW

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.

1378P

AWL

YYWW

PDIP−7

P SUFFIX

CASE 626B

The NCP1378 also features an efficient protective circuitry that, 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.

The NCP1378 is tailored for low voltage applications having

UVLO thresholds of 8.4 V (on) and 7.5 V (off).

= Assembly Location

WL, L = Wafer Lot

YY, Y = Year

WW, W = Work Week

Features

• Pb−Free Package is Available*

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

• Latched Overvoltage Protection

• Auto−Recovery Short−Circuit Protection Via UVLO Crossover

• Current−Mode with Adjustable Skip Cycle Capability

• Internal 1.0 ms Soft−Start

PIN CONNECTIONS

Dmg

• Internal Temperature Shutdown

• Internal Leading Edge Blanking

GND

Drv

• 500 mA Peak Current Source/Sink Capability

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

• Direct Optocoupler Connection

(Top View)

ORDERING INFORMATION

• SPICE Models Available for TRANsient Analysis

†

Device

Package

SOIC−8

PDIP−7

Shipping

• Internal 8.0 ms Minimum T

OFF

NCP1378DR2

NCP1378P

2500 Tape & Reel

50 Units/Tube

Typical Applications

• Battery−Based Operations

NCP1378PG

PDIP−7

(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.

*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, 2004

Publication Order Number:

October, 2004 − Rev. 1

NCP1378/D

12 3 4 5 6 7...16

中文翻译

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与NCP1378相关器件

型号	品牌	获取价格	描述	数据表
NCP1378/D	ETC	获取价格	PWM Current-Mode Controller for Free Running Quasi-Resonant Operation
NCP1378_06	ONSEMI	获取价格	PWM Current−Mode Controller for Free−Running Quasi−Resonant Operation
NCP1378DR2	ONSEMI	获取价格	PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
NCP1378DR2G	ONSEMI	获取价格	PWM Current−Mode Controller for Free−Running Quasi−Resonant Operation
NCP1378P	ONSEMI	获取价格	PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
NCP1378PG	ONSEMI	获取价格	PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
NCP1379	ONSEMI	获取价格	Quasi-Resonant Current-Mode Controller for High-Power Universal Off-line Supplies
NCP1379_11	ONSEMI	获取价格	Quasi-Resonant Current-Mode Controller for High-Power Universal Off-line Supplies
NCP1379DR2G	ONSEMI	获取价格	Quasi-Resonant Current-Mode Controller for High-Power Universal Off-line Supplies
NCP137AFCT045T2G	ONSEMI	获取价格	700 mA, Very Low Dropout Bias Rail CMOS Voltage Regulator

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