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ML4833CP Datasheet

  • ML4833CP

  • Micro Linear Corporation [Electronic Dimming Ballast Contro...

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  • MICRO-LINEAR

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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 鈥渂oost鈥?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
s
s
s
s
s
s
s
s
s
s
Complete power factor correction and dimming
ballast control in one IC
Low distortion, high efficiency continuous boost,
peak 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
Internal over-temperature shutdown replaces
external heat sensor
PFC overvoltage comparator eliminates output
鈥渞unaway鈥?due to load removal
Low start-up current <0.5mA
Power reduction pin for end of life and GFI detectors
(* Indicates part is End Of Life as of July 1, 2000)
BLOCK DIAGRAM
INTERRUPT
6
7
R
SET
R
T
/C
T
VARIABLE FREQUENCY
OSCILLATOR
OUTPUT
DRIVERS
R
X
/C
X
PRE-HEAT
AND INTERRUPT
TIMERS
OUT A
CONTROL
&
GATING LOGIC
OUT B
3
PDWN
14
LAMP FB
LFB OUT
8
4
5
9
13
PFC OUT
15
10
2
1
18
C
RAMP
PIFB
PEAO
PVFB/OVP
POWER
FACTOR
CONTROLLER
UNDER-VOLTAGE
AND THERMAL
SHUTDOWN
PGND
VCC
V
REF
GND
12
16
17
11
1

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