TLC5954 Datasheet, PDF (33/45 Pages) Texas Instruments – TLC5954 48-Channel, Constant-Current LED Driver with Global Brightness Control, LED Open-Short Detection, and Power-Save Mode

www.ti.com
TLC5954
SBVS241 – APRIL 2014
9 Applications and Implementation
9.1 Application Information
The device is a 48-channel, constant sink current, LED driver. This device is typically connected in series to drive
many LED lamps with only a few controller ports. Output current control data and on or off control data can be
written from the SIN input pin. The on or off timing can be controlled by the BLANK signal. Also, the LED open
and short error flag can be read out from the SOUT output pin.
9.2 Typical Application
In this application, the device VCC and LED lamp anode voltages are supplied from different power supplies.
V_LED
¼
¼
¼
DATA
SCLK
LAT
BLANK
Controller
SID Read
¼
¼
¼ _OUTR0
OUTB15
SIN
SCLK
SOUT
V_CC
LAT
Device 1
BLANK
VCC
GND
PowerPAD
GND
3
¼
¼ _OUTR0
OUTB15
SIN
SCLK
SOUT
V_CC
LAT
Device n
BLANK
VCC
GND
PowerPAD
GND
Figure 37. Typical Application Circuit (Multiple Daisy-Chained Devices)
9.2.1 Design Requirements
For this design example, use the following as the input parameters.
Table 11. Design Parameters
DESIGN PARAMETER
VCC input voltage range
LED lamp (V_LED) input voltage range
SIN, SCLK, LAT, and BLANK voltage range
EXAMPLE VALUE
3.0 V to 3.6 V
Maximum LED forward voltage (V_F) + 0.4 V (knee voltage)
Low level = GND, high level = VCC
Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: TLC5954
Submit Documentation Feedback
33