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TPS2595: Setting a 5.5V overvoltage lockout threshold with a 5V Vin (TPS259573)

Part Number: TPS2595

Hello
I would like to use a TPS259573DSG to set a custom 5.5V overvoltage lockout threshold (OVLO) with a 5 Volt input (normal, during fault it will be 7-8V which would damage the load thus why I am using an eFuse)
How would I set a 5.5V OVLO? The datasheet mentions using a voltage divider, but with Vin = 5V and V_OVLO = 5.5, it is not possible since it would require a resistor with negative resistance.
I assume I am misunderstanding how OVLO works, I would greatly appreciate any help. 

  • Hi Amir,

    Let me explain the functioning of ENb/OVLO pin. There is an internal comparator inside. When the voltage is above certain threshold, the device will turn off the main passFET. You want to set the resistive divider such that for the desired voltage, OVLO pin voltage crosses the threshold.

    You can set divider such that for 5.5V Vin, OVLO get >1.2V. There is some hysteresis to make this noise proof. To enable the device again, OVLO should go below <1.1V.

    Please click resolved if you don't have any follow up question. 

    Best Regards,
    Arush