9 Application and Implementation
SCLS712A – MARCH 2009 – REVISED JUNE 2015
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 LED display application, TLC59211 is used to drive the current sink for 8 LEDs in parallel. LED display pattern
can be created by providing different bit pattern. LED can be duty cycled by either duty cycling the LED supply or
the control bit.
9.2 Typical Application
8-Bit Sink Current Driver
LED Power Circuit
8-Bit Shift Register
Figure 4. LED Display Implementation With TLC59211
9.2.1 Design Requirements
For LED display application, an 8-bit shift register is used to provide the input control for TLS59211. A character
generator circuit and LED power circuit is used to generate the bit pattern written into the shift register and
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
VLED can be connected directly to the resistor and LED string.
9.2.2 Detailed Design Procedure
The combination of LED and resistor sets the current of the LED.
VR + VL = VLED, I = (VLED - VL)/R
The maximum current through each channel of TLC59211 is determined by the number of the LEDs that are on
and the duty cycle according to Figure 5 for TSSOP package.
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