LP39542 Datasheet, PDF (23/58 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

RGB Driver Electrical Characteristics (R1, G1, B1, R2, G2, B2 Outputs)
Symbol
I_LEAKAGE
I_RGB
R_SW
f_RGB
Parameter
R1, G1, B1, R2, G2, B2 pin leakage
current
Maximum recommended sink current
Accuracy @ 37mA
Current mirror ratio
RGB1 and RGB2 current mismatch
Switch resistance
RGB switching frequency
Note: RGB current should be limited as follows:
constant current mode – limit by external R_RGB resistor;
switch mode – limit by external ballast resistors
Condition
Min Typ Max Units
0.1
1
μA
CC mode
40
mA
SW mode
50
mA
R_RGB=3.3 kΩ ±1%, CC mode
CC mode
±5
%
1:100
I_RGB=37mA, CC mode
SW mode
±5
%
2.5
5
Ω
Accuracy proportional to internal clock 18.2
20
21.8 kHz
freq.
If SYNC to external 5 MHz clock is in
20
kHz
use
Output Current vs Pin Voltage (Current Sink Mode)
Pin Voltage vs Output Current (Switch Mode)
30008566
Output Current vs R_RGB (Current Sink Mode)
30008568
30008567
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