LM3463_12 Datasheet, PDF (3/40 Pages) Texas Instruments – LM3463 Dynamic Headroom Controller with Thermal Control Interface and Individual Channel Dimming Control

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Connection Diagram
LM3463
SNVS807 – MAY 2012
REFRTN 1
36 NC
IOUTADJ 2
35 DR0
VREF 3
34 NC
EN 4
33 DR1
FS 5
32 NC
Faultb 6
DIM01 7
31 DR2
EP
30 NC
DIM23 8
29 DR3
DIM4 9
28 NC
DIM5 10
27 DR4
SYNC 11
26 NC
CLKOUT 12
25 DR5
Pin Functions
Pin Descriptions
Pin
Name
Description
Application information
1
REFRTN
0V reference for small signal return This pin should connect to the end points of current sensing resistors with
paths
individual connections to ensure channel to channel current accuracy.
The current of all output channels (defined by R_ISNSn) reduces according
2
IOUTADJ Output current level adjust pin
to the voltage at this pin. This pin should connect to the VREF pin when
output current reduction is not required.
3
VREF
Precision reference voltage output
This pin is the output of a precision reference voltage regulator. This pin
must be bypassed through a ceramic capacitor to REFRTN.
Device enable pin with internal pull-up
4
EN
Enable input
Enable: V_EN = Floating
Disable: V_EN = GND
Frequency setting pin. Connect a resistor across this pin to GND to set the
5
FS
Internal oscillator control or external ^{internal oscillator frequency.}
clock input pin
The internal clock frequency can be defined by forcing an external clock
signal to this pin.
6
Faultb Fault indicator output
Fault indicator output. This pin is an open-drain output and is pulled low
when an open circuit of LED string is identified.
Multi-function input pin.
The function of this pin differs depending on the selected operation mode
that sets by the MODE pin.
Direct PWM mode: Apply a bi-level PWM signal (TTL logic high and low)
Channel 0/1 PWM dimming control to this pin to enable/disable ch0 and ch1. Apply logic high to this pin to
7
DIM01
enable channel 0 and 1.
Serial data input
In serial interface mode, this pin is configured as the serial data input.
DC voltage dimming control
In DC interface mode, the voltage on this pin is converted into PWM
dimming duty for channel 0 and 1.
Copyright © 2012, Texas Instruments Incorporated
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