TLC5926_15 Datasheet, PDF (24/39 Pages) Texas Instruments – 16-Channel Constant-Current LED Sink Drivers

TLC5926, TLC5927
SLVS677C – JULY 2008 – REVISED OCTOBER 2015
www.ti.com
11 Power Supply Recommendations
The device is designed to operate from a VDD supply between 3 V and 5.5 V. The LED supply voltage should be
determined by the number of LEDs in each string and the forward voltage of the LEDs. The maximum
recommended supply voltage on the output pins (OUT0-OUT15) is 17V.
12 Layout
12.1 Layout Guidelines
The traces that carry current from the LED cathodes to the OUTx pins must be wide enough to support the
default current (up to 120 mA).
The SDI, CLK, LE(ED1), OE(ED2), and SDO pins should be connected to the microcontroller. There are several
ways to achieve this, including the following methods:
• Traces may be routed underneath the package on the top layer.
• The signal may travel through a via to another layer.
The thermal pad in the PWP package should be connected to the ground plane through thermal relief vias. This
layout technique will improve the thermal performance of the package.
12.2 Layout Example
To µC
GND
SDI
CLK
LE(ED1)
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
VDD
R-EXT
SDO
OE(ED2)
OUT15
OUT14
OUT13
OUT12
OUT11
OUT10
OUT9
OUT8
To µC
To µC
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VLED
Via to GND
Figure 19. PWP Layout Example
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