ZHCS026C December 2010 – February 2016 TPS57060-Q1
PRODUCTION DATA.
The undervoltage lockout (UVLO) can be adjusted using an external voltage divider on the EN pin of the TPS57060-Q1. The UVLO has two thresholds, one for power up when the input voltage is rising and one for power down or brown outs when the input voltage is falling. For the example design, the supply should turn on and start switching when the input voltage increases above 8.9 V (enabled). After the regulator starts switching, it should continue to do so until the input voltage falls below 7.9 V (UVLO stop).
The programmable UVLO and enable voltages are set using a resistor divider between Vin and ground to the EN pin. Equation 2 through Equation 3 can be used to calculate the resistance values necessary. For the example application, a 332-kΩ resistor between Vin and EN and a 56.2-kΩ resistor between EN and ground are required to produce the 8.9-V and 7.9-V start and stop voltages.