9 Application and Implementation
SCLS713A – MARCH 2009 – REVISED JULY 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, TLC59212 is used to drive the current sink 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
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 LED supply, the resistor value could be determined. The TCL59212 has
a maximum current requirement less than 40mA for constant on application.
9.2.2 Detailed Design Procedure
The selection of supply voltage (VLED), LED, and resistor sets the current of the LED.
VR + VL + VOL = VLED
I = (VLED - VL - VOL) /R
VR is the voltage drop across the resistor, VL is the voltage drop across the LED when LED is on, VOL is the
output voltage at the collector when the driver is enabled. For example, when VLED = 5 V, VL = 2.4 V, and VOL
= 0.35 V, a 55-Ω resistor is used to obtain output current 40 mA.
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