LM3463_12 Datasheet, PDF (13/40 Pages) Texas Instruments – LM3463 Dynamic Headroom Controller with Thermal Control Interface and Individual Channel Dimming Control

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Block Diagram
VREF
IOUTADJ
REFRTN
ISR
OutP
CDHC
VLedFB
LM3463
Output current
control circuitry
Ref1
DHC circuitry
Faultb
FCAP
MODE
Fault/Control Logic
DIM01
DIM23
DIM4
DIM5
SYNC
Serial IF
Mode
Control
5 to 1
SAR
MUX
ADC
Oscillator (ADC, duty PCLK 8-bit Timing
cycle control)
Decoder
LM3463
SNVS807 – MAY 2012
VBG
ADCRef
Pre-Regulator
High voltage Fault detection
circuitry
Fault
S/H
Fault
S/H
Fault
S/H
Fault
S/H
Fault
S/H
Fault
S/H
Ref1
Ref1
Ref1
Ref1
Ref1
Ref1
VIN
VCC
EN
DRVLIM
DR0
DR1
DR2
DR3
DR4
DR5
GD0
SE0
GD1
SE1
GD2
SE2
GD3
SE3
GD4
SE4
GD5
SE5
GND
Overview
The LM3463 is a six channel linear current regulator which designed for LED lighting applications. The use of the
Dynamic Headroom Control (DHC) method secures high system power efficiency and prolongs system operation
lifetime by minimizing the power stress on critical components. The output currents of the LM3463 driver stage
are regulated by six individual low-side current regulators.
Copyright © 2012, Texas Instruments Incorporated
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