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參數(shù)資料
| 型號： | ML4832 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Electronic Dimming Ballast Controller(電子調(diào)光整流器控制器) |
| 中文描述： | 電子調(diào)光鎮(zhèn)流器控制器（電子調(diào)光整流器控制器） |
| 文件頁數(shù)： | 1/15頁 |
| 文件大小： | 151K |
| 代理商： | ML4832 |
July 2000
PRELIMINARY
ML4832
*
Electronic Dimming Ballast Controller
GENERAL DESCRIPTION
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.
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.
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.
FEATURES
I
Complete power factor correction and dimming
ballast control in one IC
Low distortion, high efficiency continuous boost,
average current sensing PFC section
Programmable start scenario for rapid or instant
start lamps
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
Large oscillator amplitude and gain modulator
improves noise immunity
Low start-up current <0.5mA
I
I
I
I
I
I
I
I
I
BLOCK DIAGRAM
7
R
SET
VARIABLE FREQUENCY
OSCILLATOR
8
R
T
/C
T
10
R
X
/C
X
PRE-HEAT
AND INTERRUPT
TIMERS
CONTROL
&
GATING LOGIC
2
IA OUT
4
IA+
POWER
FACTOR
CONTROLLER
UNDER-VOLTAGE
AND THERMAL
SHUTDOWN
OUTPUT
DRIVERS
3
I
SINE
1
EA OUT
18
EA–/OVP
V
REF
17
PFC OUT
15
GND
11
V
CC
16
PGND
12
OUT B
13
OUT A
14
LFB OUT
6
LAMP FB
5
INTERRUPT
9
(* Indicates part is End Of Life as of July 1, 2000)
REV. 1.0 10/12/2000
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4832CP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4832CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Electronic Dimming Ballast Controller |
| ML4833 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:帶功率因數(shù)校正的調(diào)光電子鎮(zhèn)流器控制器ML4833 |
| ML4833CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Electronic Dimming Ballast Controller |
| ML4833CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Electronic Dimming Ballast Controller |
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