TLC59108F_15 Datasheet, PDF (27/37 Pages) Texas Instruments – 8-Bit FM+ I2C Bus LED Driver

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TLC59108F
SLDS162B – MARCH 2009 – REVISED DECEMBER 2015
9.2.3 Application Curve
The following graph shows the typical LED Current as a function of R_SET and V_F. The graph assumes that V_LED =
5 V.
70
VF = 2 V
60
VF = 3 V
50
VF = 4 V
40
30
20
10
0
0
100 200 300 400 500 600 700
R_SET (Ÿ)
C001
Figure 24. LED Current vs R_SET
10 Power Supply Recommendations
TLC59108F is designed to operate from a V_CC range of 3 V to 5.5 V. The system will also require a power supply
for the LEDs. The supply voltage for the LEDs must be greater than the forward voltage of the LED plus the V_OL
of the channel.
11 Layout
11.1 Layout Guidelines
The I²C signals (SDA / SCL) should be kept away from potential noise sources.
The traces carrying power through the LEDS should be wide enough to handle the necessary current.
All LED current passes through the device and into the ground node. There must be a strong connection
between the device ground and the circuit board ground. For the RGY package, the thermal pad should be
connected to ground to help dissipate heat.
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