16-bit Constant Current LED Driver with Error Detection

Version:A.006

Page 16

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DM13C

Outputs Delay

Large in-rush currents will occur when the system activates all the outputs at once. To reduce

this effect, DM13C is designed to have a constant unit of delay (around 1.5ns) between outputs. The

delay for every output goes like this: there is no delay for OUT15 and OUT7, 1 unit of delay for

OUT14 and OUT6, 2 units of delay for OUT13 and OUT5 and so on.

Global Brightness Control

DM13C has no built-in global brightness control feature. In order to obtain a lower resolution

of global brightness control effect, two methods could be utilized. One is providing PWM signal

synchronized on latch pulse to modulate the output enable terminal (EN pin). The other is to adjust

the Rrext value or voltage drop across the external resistor. Please see the reference circuit below:

REXT

Global Brightness Control with Resistor Ladder

REXT

Digital

Resistor

Controller

Global Brightness Control

with Digital Resistor

REXT

Digital-to-Analog

Converter

Controller

Global Brightness Control

with D/A converter

Rrext