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| LM3463_12 Datasheet, PDF (27/40 Pages) Texas Instruments – LM3463 Dynamic Headroom Controller with Thermal Control Interface and Individual Channel Dimming Control | |||
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www.ti.com
DIM23
50%
50%
DIM01
DIM4
tDS
tDS > 10 ns
tBIT
tBIT > 20 ns
50%
tLATCH
tLATCH > 50 ns
Figure 15. Timing parameters of the serial data interface
PWM dimming duty
256/256
255/256
254/256
253/256
252/256
LM3463
SNVS807 â MAY 2012
6/256
5/256
4/256
3/256
2/256
(Skipped) 1/256
0
Input Data Code
(Decimal)
Figure 16. PWM dimming duty vs code value of a data byte
DC Interface Mode
Connecting the MODE pin to VCC enables DC interface mode. In this mode the LM3463 converts the voltage on
the dimming signal input pins into PWM dimming duty to the corresponding output channels. The six output
channels are separated into four individual groups to accept external PWM dimming signals as listed in the
following table:
Group A
Group B
Group C
Group D
CH0 and CH1, controlled by the voltage at DIM01 pin
CH2 and CH3, controlled by the voltage at DIM23 pin
CH4, controlled by the voltage at DIM4 pin
CH5, controlled by the voltage at DIM5 pin
Copyright © 2012, Texas Instruments Incorporated
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