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參數(shù)資料
| 型號(hào)： | ML4833 |
| 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)： | 1/13頁 |
| 文件大?。?/td> | 136K |
| 代理商： | ML4833 |
July 2000
PRELIMINARY
ML4833
*
Electronic Dimming Ballast Controller
GENERAL DESCRIPTION
The ML4833 is a complete solution for a dimmable or a
non-dimmable, high power factor, high efficiency
electronic ballast. The BiCMOS ML4833 contains
controllers for “boost” type power factor correction as
well as for a dimming ballast. The ML4833 was designed
to minimize the number of external components required
to build an electronic ballast.
The PFC circuit uses a new, simple PFC topology which
requires only one loop for compensation. This system
produces a power factor of better than 0.99 with low
input current THD. An overvoltage protection comparator
inhibits the PFC section in the event of a lamp out or lamp
failure condition.
The ballast controller section provides for programmable
starting sequence with individually adjustable preheat and
lamp out-of-socket interrupt times. The IC controls lamp
output power through feedback. The ML4833 provides a
power down input which reduces power to the lamp, for
GFI, end of life, etc.
FEATURES
I
Complete power factor correction and dimming
ballast control in one IC
I
Low distortion, high efficiency continuous boost,
peak current sensing PFC section
I
Programmable start scenario for rapid or
instant start lamps
I
Lamp current feedback for dimming control
I
Variable frequency dimming and starting
I
Programmable restart for lamp out condition to
reduce ballast heating
I
Internal over-temperature shutdown replaces
external heat sensor
I
PFC overvoltage comparator eliminates output
“runaway” due to load removal
I
Low start-up current <0.5mA
I
Power reduction pin for end of life and GFI detectors
BLOCK DIAGRAM
6
R
SET
VARIABLE FREQUENCY
OSCILLATOR
7
R
T
/C
T
9
R
X
/C
X
PRE-HEAT
AND INTERRUPT
TIMERS
CONTROL
&
GATING LOGIC
3
PDWN
10
C
RAMP
POWER
FACTOR
CONTROLLER
UNDER-VOLTAGE
AND THERMAL
SHUTDOWN
OUTPUT
DRIVERS
2
PIFB
1
PEAO
18
PVFB/OVP
V
REF
17
PFC OUT
15
GND
11
VCC
16
PGND
12
OUT B
13
OUT A
14
LFB OUT
5
LAMP FB
4
INTERRUPT
8
(* Indicates part is End Of Life as of July 1, 2000)
REV. 1.0 10/12/2000
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