ML4836 Datasheet, PDF (1/15 Pages) Micro Linear Corporation – Compact Fluorescent Electronic Dimming Ballast Controller

July 2000
PRELIMINARY
ML4836*
Compact Fluorescent
Electronic Dimming Ballast Controller
GENERAL DESCRIPTION
The ML4836 is a complete solution for a dimmable or a
non-dimmable high efficiency electronic ballast especially
tailored for a compact fluorescent lamp (CFL). The
Bi-CMOS ML4836 contains controllers for dimming
ballast with end-of-life detection capability.
The ballast controller section provides for programmable
starting sequence with individual adjustable preheat and
lamp out-of-socket interrupt times. The ML4836 provides
latch type shut down comparator for ballast controllers in
the event of end-of-life for the CFL.
BLOCK DIAGRAM
FEATURES
s Programmable start scenario for rapid/instant start lamps
s Triple frequency control network for dimming or
starting to handle various lamp sizes
s Programmable restart for lamp out condition to reduce
ballast heating.
s Internal over-temperature shutdown
s Low start-up current; < 0.55mA
(* Indicates Part is End Of Life as of July 1, 2000)
RSET
4
RT/CT
6
RT2
5
PWDET
9
ANTI-FLASH
COMPENSATION
AND
DIMMING LEVEL
INTERFACE
VARIABLE FREQUENCY
OSCILLATOR
THREE-FREQUENCY
CONTROL SEQUENCER
VCO
END-OF-LAMP DETECT
AND
POWER SHUTOFF
UNDER-VOLTAGE
AND
THERMAL SHUTDOWN
AGND REF ^VCC
10
1
14
CONTROL
AND
GATING
LOGIC
INTERRUPT
7
LAMP FB
2
LEAO
3
OUTPUT
DRIVERS
PRE-HEAT AND
INTERRUPT TIMERS
LAMP OUT DETECT
AND
AUTOMATIC LAMP
RESTART
OUT A
13
OUT B
12
PGND
11
RX/CX
8
1