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TLC5923 Datasheet(PDF) 7 Page - Texas Instruments

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Part # TLC5923
Description  LED DRIVER
Download  15 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TLC5923 Datasheet(HTML) 7 Page - Texas Instruments

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PRINCIPLES OF OPERATION
Setting Maximum Channel Current
I
MAX +
V
IREF
R
IREF
40
(1)
100
1 k
10 k
100 k
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0
48.8 k
9.76 k
4.88 k
2.44 k
1.63 k
1.22 k
976
813
697
IOLC − Output Current − mA
VOutn = 1 V
DC = 127
Setting Dot-Correction
I
Outn +
I
MAX
DCn
127
(2)
TLC5923
SLVS550 – DECEMBER 2004
The maximum output current per channel is set by a single external resistor, R(IREF), which is placed between
IREF and GND. The voltage on IREF is set by an internal band gap V(IREF) with a typical value of 1.24V. The
maximum channel current is equivalent to the current flowing through R(IREF) multiplied by a factor of 40. The
maximum output current can be calculated by Equation 1:
where:
VIREF = 1.24V typ.
RIREF = User selected external resistor (RIREF should not be smaller than 600 Ω)
Figure 8 shows the maximum output current, IO(LC), versus R(IREF) . In Figure 8, R(IREF) is the value of the resistor
between IREF terminal to ground, and IO(LC) is the constant output current of OUT0,.....OUT15.
Figure 8. Reference Resistor vs Output Current
The TLC5923 has the capability to fine adjust the current of each channel, OUT0 to OUT15 independently. This
is also called dot correction. This feature is used to adjust the brightness deviations of LED connected to the
output channels OUT0 to OUT15. Each of the 16 channels can be programmed with a 7-bit word. The channel
output can be adjusted in 128 steps from 0% to 100% of the maximum output current IMAX. Equation 2
determines the output current for each OUTn:
where:
IMax = the maximum programmable current of each output
DCn = the programmed dot-correction value for output n (DCn = 0, 1, 2 ...127)
n = 0, 1, 2 ... 15
7


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