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ML4832CS

更新时间： 2024-02-21 16:15:10
品牌 Logo 应用领域
MICRO-LINEAR 光电二极管信息通信管理电子控制器
页数 文件大小 规格书
15页 288K
描述
Electronic Dimming Ballast Controller

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中文翻译

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ML4832CS 数据手册

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July 2000  
PRELIMINARY  
ML4832*  
Electronic Dimming Ballast Controller  
GENERAL DESCRIPTION  
FEATURES  
■
■
■
Complete power factor correction and dimming  
ballast control in one IC  
The ML4832 is a complete solution for a dimmable/non-  
dimmable, high power factor, high efficiency electronic  
ballast. The BiCMOS ML4832 contains controllers for  
“boost” type power factor correction as well as for a  
dimming ballast.  
Low distortion, high efficiency continuous boost,  
average current sensing PFC section  
Programmable start scenario for rapid or instant  
start lamps  
The power factor circuit uses the average current sensing  
method with a gain modulator and overvoltage protection.  
This system produces a power factor of better than 0.99  
with low input current THD at > 95% efficiency. Special  
care has been taken in the design of the ML4832 to  
increase system noise immunity by using a high amplitude  
oscillator, and a current-fed multiplier. An overvoltage  
protection comparator inhibits the PFC section in the  
event of a lamp out or lamp failure condition.  
■
■
■
Lamp current feedback for dimming control  
Variable frequency dimming and starting  
Programmable restart for lamp out condition to  
reduce ballast heating  
■
■
■
■
Over-temperature shutdown replaces external  
heat sensor for safety  
PFC overvoltage comparator eliminates output  
“runaway” due to load removal  
The ballast section provides for programmable starting  
scenarios with programmable preheat and lamp out-of-  
socket interrupt times. The IC controls lamp output through  
frequency modulation using lamp current feedback.  
Large oscillator amplitude and gain modulator  
improves noise immunity  
Low start-up current <0.5mA  
(* Indicates part is End Of Life as of July 1, 2000)  
BLOCK DIAGRAM  
INTERRUPT  
LAMP FB  
9
5
6
R
SET  
7
VARIABLE FREQUENCY  
LFB OUT  
OSCILLATOR  
R /C  
T
T
8
OUTPUT  
DRIVERS  
OUT A  
14  
13  
15  
PRE-HEAT  
AND INTERRUPT  
TIMERS  
R /C  
X
X
CONTROL  
10  
&
GATING LOGIC  
OUT B  
PFC OUT  
IA OUT  
IA+  
2
4
POWER  
FACTOR  
I
PGND  
SINE  
3
12  
CONTROLLER  
EA OUT  
V
CC  
1
16  
17  
11  
EA–/OVP  
UNDER-VOLTAGE  
AND THERMAL  
SHUTDOWN  
V
REF  
18  
GND  
1
1234567...15

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