TLC5940_15 Datasheet, PDF (23/38 Pages) Texas Instruments – 16-Channel LED Driver

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9 Application and Implementation
TLC5940
SLVS515D – DECEMBER 2004 – REVISED NOVEMBER 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The device is a 16-channel, constant sink current, LED driver. This device can be connected in series to drive
many LED lamps with only a few controller ports. Output current control data, dot correction data and PWM
control data can be written from the SIN input terminal.
9.2 Typical Application
V_CC
V_(LED)
V_(LED)
V_(LED)
V_(LED)
Controller
SIN
XERR
SCLK
XLAT
GSCLK
DCPRG
BLANK
SOUT
W_EEPROM
VPRG_D
VPRG_OE
100 k
SIN
XERR
SCLK
XLAT
GSCLK
DCPRG
BLANK
VPRG
OUT0
TLC5940
IC 0
7
OUT15
SOUT
V_CC
100 nF
IREF
SIN
XERR
SCLK
XLAT
GSCLK
DCPRG
BLANK
VPRG
OUT0
TLC5940
IC n
OUT15
SOUT
V_CC
100 nF
IREF
V_(22V)
V_(22V)
50 k
50 k
50 k
50 k
50 k
50 k
VPRG
Figure 22. Cascading Devices
9.2.1 Design Requirements
For this design example, use the input parameters shown in Table 4.
Table 4. Design Parameters
PARAMETERS
VCC input voltage range
LED lamp (V_LED) input voltage range
SIN, SCLK, XLAT, GSCLK, and BLANK voltage range
VALUES
3.0 V to 5.5 V
>Maximum LED forward voltage (V_F) + IC knee voltage
Low level = GND, High level = VCC
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