8.2.2.7 Undervoltage Lockout Set Point

The undervoltage lockout (UVLO) can be adjusted using the external voltage divider network of R1 and R2. R1

is connected between VIN and the EN pin of the TPS562211 and R2 is connected between EN and GND. The

UVLO has two thresholds, one for power up when the input voltage is rising and one for power down or

brownouts when the input voltage is falling. For the example design, the supply should turn on and start

switching when the input voltage increases above 6.6 V (UVLO start or enable). After the regulator starts

switching, it must continue to do so until the input voltage falls below 5.7 V (UVLO stop or disable). Equation 3

and Equation 4 can be used to calculate the values for the upper and lower resistor values. For the stop voltages

specified, the nearest standard resistor value for R1 is 174 kΩ and for R2 is 36.5 kΩ.

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TPS562211

SLUSDX0 – SEPTEMBER 2020

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