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| LP39542 Datasheet, PDF (26/58 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit | |||
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Backlight Drivers
LP39542 has 2 independent backlight drivers. Both drivers
are regulated constant current sinks. LED current for both
LED banks (WLED1â¦4 and WLED5â¦6) are controlled by 8-
bit current mode DACs with 0.1 mA step.
WLED1â¦4 and WLED5â¦6 can be also controlled with one
DAC for better matching allowing the use of larger displays
having up to 6 white LEDs in parallel.
Display configuration is controlled with DISPL bit as shown in
the following table.
DISPL
0
1
Configuration
Main display up
to 4 LEDs
Sub display up
to 2 LEDs
Large display
up to 6 LEDs
Matching
Good btw
WLED1â¦4
Good btw
WLED5â¦6
Good btw
WLED 1â¦6
30008535
Main display up to 4 LEDs (WLED1â¦4)
30008536
Sub display driver up to 2 LEDs (WLED5â¦6)
Main display up to 6 LEDs (WLED1â¦6) (DISPL=1)
30008537
www.national.com
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