SLVSD26B April 2016 – April 2021 TPS54202
PRODUCTION DATA
The undervoltage lockout (UVLO) set point can be adjusted using the external-voltage divider network of R4 and R5. R4 is connected between the VIN and EN pins of the TPS54202 device. R5 is connected between the EN and GND pins. The UVLO has two thresholds, one for power up when he input voltage is rising and one for power down or brown outs when the input voltage is falling. For the example design, the minimum input voltage is 8 V, so the start-voltage threshold is set to 6.8 V with 1000-mV hysteresis. Use Equation 1 and Equation 2 to calculate the values for the upper and lower resistor values of R4 and R5.