Datasheet > ML4841

ML4841

更新时间： 2024-09-07 22:54:47

品牌	Logo	应用领域
MICRO-LINEAR		功率因数校正控制器
页数	文件大小	规格书
15页	285K
描述
Variable Feedforward PFC/PWM Controller Combo

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

ML4841 数据手册

May 1997

ML4841*

Variable Feedforward PFC/PWM Controller Combo

GENERAL DESCRIPTION

FEATURES

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).

■ Internally synchronized PFC and PWM in one IC

■ Low total harmonic distortion

■ Reduced 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

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

comparator 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.

for current mode or voltage mode operation

■ Average line voltage compensation with brown-out

control

■ 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

*Some Packages Are End Of Life Or Obsoete

POWER FACTOR CORRECTOR

IEAO

VEAO

CCZ

OVP

REF

VEA

13.5V

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

T T

OSCILLATOR

÷2

RAMP 2

DUTY CYCLE

LIMIT

1.25V

PWM OUT

50µA

2.5V

DC I

LIMIT

UVLO

CCZ

PULSE WIDTH MODULATOR

12 3 4 5 6 7...15

中文翻译

下载PDF

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