• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 550 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8701: How does the Reverse Supply Protection work?

Jace Chen
Intellectual 390 points
Part Number: DRV8701

Please help explain how this Reverse Supply Protection works.

  • 0
    TI__Guru** 114905 points
    Hi Jace,

    The components are there to allow proper operation when the voltage is connected correctly, and to disable the NMOS FET when the voltage has been reversed.

    There are diodes through the DRV8701 that are forward biased when the voltage is reversed. This will lead to a voltage of approximately the battery voltage - 3Vf diodes at VCP. If the voltage is not clamped by the npn BJT, the NMOS FET would be enhanced and complete the circuit.

    The 10k resistor is limiting the collector current of the npn and the 43k resistor is limiting the base current of the npn.

    Is there a specific section of the circuit that you need further explanation?