LX1996 Datasheet, PDF (4/22 Pages) Microsemi Corporation – Multi-string LED Back-light Controller

LX1996
TM
®
Multi-string LED Back-light Controller
PRODUCTION DATASHEET
FUNCTIONAL BLOCK DIAGRAM
VIN
VLDO
5V
REGULATOR
4-bit DAC
FB
BOOST CONVERTER
CONTROL LOGIC
SRC
COIL CURRENT
SENSE
+
-
ULTRASONIC
TIMER
OFF TIMER
Toff=f(VCC)
+
- 2V
NGATE
DRIVER
EN
DSEL1
DSEL2
OT
PRG
DI
PWM
RT
CT
CLF
MODE
CONTROL
LED CURRENT
TEMPRATURE
PROFILER
LED CURRENT
REFERENCE
ANALOG
DIMMING
0.2V/2V LIMIT
TRIANGLE
WAVE
GENERATOR
PLL
LED CURRENT OUTPUT,
LED OPEN/SHORT DETECTION,
BOOST CONVERTER REGULATION REFERENCE
CURRENT SOURCE
OUTPUT #6
CURRENT SOURCE
OUTPUT #5
LED CURRENT
REFERENCE
FBref Gen.
FBref
CURRENT SOURCE
OUTPUT #4
CURRENT SOURCE
OUTPUT #3
CURRENT SOURCE
OUTPUT #2
DIGITAL
DIMMING
MU
CLOCK
X
ANALOG TO
DIGITAL
DIMMING
FB
BOOST FB
+
- FBref
CS OVER VOLTAGE LIMIT
+
- 25V
LED SHORT
DETECTION
+
CS OVER VOLTAGE - 15V
LED OPEN
DETECTION
CS OPEN
+
- 0.2V
OUTPUT
CONTROL
LOGIC
OUTPUT ENABLE
CURRENT SOURCE
OUTPUT #1
DRV
OVP
GND
CS6
CS5
CS4
CS3
CS2
CS1
PGND
Copyright © 2007
Rev. 1.0, 2007-12-14
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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