SLVUDI8 September 2025 TLA431
Set RSUP in conjunction with Vdd and the desired cathode voltage (VKA) to provide enough current for operation. The TLA431 needs > 0.2mA to operate in the proper gain region for accurate regulation. Use Equation 1 to determine the cathode current.
When setting IKA, be sure not to exceed the absolute maximum rating of 100mA for TLA431. For evaluation above 50mA, remove resistor R6 and replace with a resistor of a higher power rating. The TLA431EVM default R6 has a power rating of 0.5W.