TLC5902_05 Datasheet, PDF (17/23 Pages) Texas Instruments – LED DRIVER

TLC5902
LED DRIVER
90
80
70
60
50
40
30
20
10
0
0.1
PRINCIPLES OF OPERATION
SLLS382 – DECEMBER 1999
+ + Conditions : V_O 1 V, V_(IREF) 1.24 V
0 _W I_OL(C)(mA)
V_(IREF)(V)
R_(IREF)(k
38
W 0 R_(IREF)(k )
47
I_OL(C)(mA)
NOTE: The output current is at 16 bit output.
When 8-bit output, it will be the current of sum of two
outputs. This sum current should be set up with the range
of 10 mA to 120 mA. The resistor, RIRF, should be located
as close as possible to IREF terminal to eliminate the noise
influence.
1
10
R(IREF) – kΩ
Figure 4. Current on Constant Current Output vs External Resistor
100
90
80
RIREF _{= 590 Ω}
70
RIREF = 670 Ω
60
RIREF = 780 Ω
50
RIREF = 940 Ω
40
RIREF = 1.18 kΩ
30
RIREF = 1.57 kΩ
20
RIREF = 2.35 kΩ
Minimum voltage applied
10
RIREF = 4.70 kΩ
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
VO _{– Output Voltage –V}
NOTE: VCCLOG = VCCANA = PVCC = 5 V, TA = 25°C.
Figure 5. Current on Constant Current Output vs Voltage Applied To Constant Current Output Terminal
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