TLC59210 Datasheet, PDF (11/22 Pages) Texas Instruments – 8-BIT DMOS SINK DRIVER WITH LATCH

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9 Application and Implementation
TLC59210
SCLS711A – MARCH 2009 – 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
In an LED display application, TLC59210 is used to drive the current sink for 8 LEDs in parallel. LED display
patterns can be created by providing different bit patterns. Each LED can be duty cycled by either duty cycling
the LED supply or the control bit.
9.1.1 Setting LED Current
The LED current is primarily dependent on the supply voltage, the forward voltage of the LED, and the series
resistor (RSET). In many applications the supply voltage and LED forward voltage cannot be adjusted. Hence,
RSET is utilized to adjust the LED current.
9.1.2 PWM Brightness Dimming
The perceived brightness of the LEDs can be adjusted by use of PWM dimming. For example, an LED driven at
50% duty cycle will appear less bright than it would at 100% duty cycle.
9.2 Typical Application
V_LED
Character
Generator Circuit
and
LED Power Circuit
CLK
CLR
8-Bit Sink Current Driver
TLC59210
Parallel Data Bus
Figure 8. Typical Application Schematic
9.2.1 Design Requirements
For an LED display application, a parallel data bus used to provide the input control for TLS59210. A character
generator circuit and LED power circuit are used to generate the bit pattern written into the TLC59210 to provide
the power control for the entire LED array. The LED power circuit controls the total current into the array and can
also power cycle the LED array. For simple implementation, LED power circuit could be eliminated. The V_LEDcan
be connected directly to the resistor and LED string.
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