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| TLC6C5712-Q1_15 Datasheet, PDF (57/64 Pages) Texas Instruments – TLC6C5712-Q1 12-Channel, Full-Diagnostic, Constant-Current-Sink LED Driver With 8-Bit Dot Correction | |||
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VSUPPLY
TLC6C5712-Q1
SLVSCO9A â AUGUST 2015 â REVISED AUGUST 2015
OUT0 OUT2 OUT1 OUT3 OUT9 OUT11
VCC
VCC
VCC
GND
PGND
TLC6C5712-Q1
SENSE
Controller
MOSI
ERR
SCK
LATCH
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
MISO
SDI
ERR
SCK
LATCH
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
SDO
IREF
RIREF
OUT0 OUT2 OUT1 OUT3 OUT9 OUT11
VCC
VCC
GND TLC6C5712-Q1
PGND
SDI
ERR
SCK
LATCH
PWM0
PWM1
PWM2
PWM3
PWM4
PWM5
SDO
RIREF
Figure 109. Application Schematic for TLC6C5712-Q1 Devices With Parallel Outputs
8.2.2.1 Design Requirements
For this design example, use the parameters listed in Table 56.
Table 56. Design Parameters
DESIGN PARAMETER
I(LED_FULLRANGE) (1)
I(LED) (2)
Channels in parallel
EXAMPLE VALUE
20 mA
16 mA
2
8.2.2.2
(1) I(LED_FULLRANGE) is the maximum LED current allowed.
(2) I(LED) is the required output driving current for this application.
Detailed Design Procedure
This design has multiple TLC6C5712-Q1 devices connected by a SPI daisy chain. Use Equation 7 to calculate
the reference resistor value.
R(IREF) =
V(IREF)
I(LED _ FULLRANGE)
´
K(OUT)
=
1.229
0.14 A
V
/2
´ 500
=
878
W
No. of parallel channels
(7)
Use Equation 8 to calculate the dot correction for each channel.
Dot correction = 140 ´ 256 - 1 = 255, (0xFF)
140
(8)
Copyright © 2015, Texas Instruments Incorporated
Product Folder Links: TLC6C5712-Q1
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