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TPS62933F: The meaning of parameters Ip and Ih

GJ H
Prodigy 120 points
Part Number: TPS62933F

Dear TI experts.

     I have read the datasheet of TPS62933F, but I do not understand the meaning of the parameters Ip and Ih, especially the term 'hysteresis voltage'. Could you explain it in detail? Additionally, in the recommended circuit you provided, the resistance at the EN pin is in the kΩ magnitude. Can the values of these two resistors be proportionally reduced?Thanks!

  • 0
    TI__Genius 15047 points

    Hello GJ,

    This configuration could set a higher input start voltage and input stop voltage. Our device has internal input UVLO, about 3.6V (rising) and 3.3V (falling). If customers want a higher UVLO threshold, e.g. 6Vin to start up, 5Vin to stop the device, they could use this configuration, and Ip/Ih will set a hysteresis window.

    The resistor values will decide Vin_start and Vin_stop values, even though you proportionally reduce two resistors, the Vin_start and Vin stop could be different.

    Please follow the datasheet equations to check.

  • 0 in reply to Miranda Gu
    Prodigy 120 points

    Hello Miranda,

           Could you please provide a specific example to illustrate this principle? This may be very helpful for my design. Thanks!

  • 0 in reply to GJ H
    TI__Genius 15047 points

    Hi GJH,

    I already posted the example: our device has internal input UVLO, about 3.6Vin (Vin_start) and 3.3Vin (Vin_stop). If customers want a higher UVLO threshold, e.g. 6Vin to start up the device (Vin_start), 5Vin to stop the device (Vin_stop), they could use this configuration. 

    Let me know your further questions.