ML4841

更新时间： 2024-09-07 22:54:47

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		功率因数校正控制器
页数	文件大小	规格书
15页	130K
描述
Variable Feedforward PFC/PWM Controller Combo

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中文翻译

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数据手册

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ML4841 数据手册

www.fairchildsemi.com

ML4841

Variable Feedforward PFC/PWM Controller Combo

Features

General Description

• Internally synchronized PFC and PWM in one IC

• Low total harmonic distortion

• Reduces ripple current in the storage capacitor between

the PFC and PWM sections

• Average current, continuous mode, boost type, leading

edge PFC

• High efﬁciency trailing edge PWM can be conﬁgured for

current mode or voltage mode operation

• Average line voltage compensation with brown-out

control

The ML4841 is a controller for power factor corrected,

switched mode power supplies. Power Factor Correction

(PFC) allows the use of smaller, lower cost bulk capacitors,

reduces power line loading and stress on the switching FETs,

and results in a power supply that fully complies with

IEC1000-2-3 speciﬁcations. The ML4841 includes circuits

for the implementation of a leading edge, average current,

“boost” type power factor correction, and a trailing edge,

pulse width modulator (PWM).

The PFC frequency of the ML4841 is automatically set at

half that of the PWM frequency generated by the internal

oscillator. This technique allows the user to design with

smaller output components while maintaining the optimum

operating frequency for the PFC. An over-voltage compara-

tor shuts down the PFC section in the event of a sudden

decrease in load. The PFC section also includes peak current

limiting and input voltage brown-out protection.

• PFC overvoltage comparator eliminates output

“runaway” due to load removal

• Current fed multiplier for improved noise immunity

• Overvoltage protection, UVLO, and soft start

Block Diagram

POWER FACTOR CORRECTOR

IEAO

VEAO

CCZ

13.5V

OVP

REF

VEA

7.5V

REFERENCE

IEA

3.5kΩ

2.7V

-1V

2.5V

GAIN

MODULATOR

RMS

PFC OUT

3.5kΩ

PFC I

LIMIT

SENSE

RAMP 1

R C

OSCILLATOR

÷2

RAMP 2

DUTY CYCLE

LIMIT

1.25V

PWM OUT

50µA

2.5V

DC I

LIMIT

UVLO

CCZ

PULSE WIDTH MODULATOR

REV. 1.0.3 6/13/01

12 3 4 5 6 7...15

中文翻译

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与ML4841相关器件

型号	品牌	获取价格	描述	数据表
ML4841CP	FAIRCHILD	获取价格	Variable Feedforward PFC/PWM Controller Combo
ML4841CP	MICRO-LINEAR	获取价格	Variable Feedforward PFC/PWM Controller Combo
ML4841CP_NL	FAIRCHILD	获取价格	Power Factor Controller With Post Regulator, Current-mode, 0.5A, PDIP16, LEAD FREE, PLASTI
ML4841CS	MICRO-LINEAR	获取价格	Variable Feedforward PFC/PWM Controller Combo
ML4841CSX	FAIRCHILD	获取价格	Switching Regulator/Controller, PDSO16,
ML4841IP	MICRO-LINEAR	获取价格	Variable Feedforward PFC/PWM Controller Combo
ML4841IS	MICRO-LINEAR	获取价格	Variable Feedforward PFC/PWM Controller Combo
ML4841ISX	FAIRCHILD	获取价格	暂无描述
ML485	TRIQUINT	获取价格	1.6-3.2 GHz High IP3 Mixer with Integrated LO Amp
ML485	WJCI	获取价格	1.6-3.2 GHz High IP3 Mixer with Integrated LO Amp