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OPT8241-CDK-EVM: OPT8241NBN

jianyuan liu
Intellectual 380 points

Part Number: OPT8241-CDK-EVM

in my AR glasses system,we will use opt9221 and opt8241.

i have read the sch of "OPT8241-CDK-EVM SB REV2P0V1 rev2.0.1".

but i have a question about page21 on right-top of the sheet. and this circuit is about U1（pMos）and U2（nMos）.

i think VCC_5V0_MINUS_FSC will always go to the VSUB_BIAS without be care of the ILLUM_ENz is 1 or 0, because the U1 have the body-diod.

and i think  VSUB_BIAS cann't supply to VCC_5V0_MINUS_FSC.

thank you!

  • 0
    TI__Expert 3800 points
    Hi!

    Thanks for your interest.
    The circuit has been designed in a way such that the MOSFETs block voltages when they are switched off. For each of U1 and U2, the blocking voltage is such that the body diode is revere biased when the MOSFET is switched off.
    So, the body diode will actually not affect the behavior of the circuit.

    Thanks and Regards,
    Subhash