TLC59213_15 Datasheet, PDF (8/19 Pages) Texas Instruments – 8-Bit Parallel In and Out Darlington Source Driver

TLC59213, TLC59213A
SLVS867B – MAY 2009 – REVISED AUGUST 2015
9 Application and Implementation
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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 LED display application, TLC59213 is used to drive the current source for 8 LEDs in parallel. LED display
pattern can be created by providing different bit pattern. At every positive clock edge, new bit pattern will be
transferred to LED display.
9.2 Typical Application
TLC59213
MCU
Figure 4. Typical Application Diagram
9.2.1 Design Requirements
For LED display application, LED is selected based on the application. The current level is determined by the
required brightness. Given the available supply, the resistor value could be determined. The maximum output
current is constrained by the duty cycle. See Figure 1 and Figure 2.
9.2.2 Detailed Design Procedure
The selection of supply voltage (VCC), LED, and resistor sets the current of the LED.
VR + VL + VCE = VCC
(1)
I = (VCC - VL - VCE) /R
(2)
VR is the voltage drop across the resistor, VL is the voltage drop across the LED when LED is on, VCE is the
collector-to-emitter voltage of the Darlington current source driver, when the driver is enabled. For example,
when VCC = 12 V, VL = 2.9 V, and VCE = 1.6 V, a 75-Ω resistor is used to obtain output current 100 mA.
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