TPS562212
ZHCSNA3 –OCTOBER 2021
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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 TPS562212 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). 方程式 3 and
方程式 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 kΩand for R2 is 36.5 kΩ.
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