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Original question:

TPS65381A-Q1: VCP Value

TPS65381A-Q1: ramp-down

Jinqi Zhu
Prodigy 40 points
Part Number: TPS65381A-Q1

TPS65381A, data sheet, page 8, (4):

"Under slow VBAT ramp-down and when VDD3/5 rail is configured as a 5-V rail, the NRES output can be pulled low when VBAT is at
approximately 6.3 V. This occurs because of an undervoltage transient on the VDD3/5 rail. "

why could this situation happen?

CAN net must be operational when power supply is as low as 6V in automotive circumstance.  

  • 0
    TI__Genius 9380 points

    I have attached a file that will explain the under voltage transient behavior of the TPS65381A-Q1.

    There is a link in the data sheet in Page 8, (4) note.

    (4) Under slow VBAT ramp-down and when VDD3/5 rail is configured as a 5-V rail, the NRES output can be pulled low when VBAT is at

    approximately 6.3 V. This occurs because of an undervoltage transient on the VDD3/5 rail.

    Under slow VBAT ramp-up and when VDD3/5 rail is configured as a 5-V rail, the NRES output can be pulled low when VBAT is at

    approximately 6.6 V. This occurs because of an undervoltage transient on VDD3/5 rail. Under similar conditions, undervoltage transients

    are observed on VDD5 and VSOUT1 rails (refer to Device Behavior Under Slow VBAT Ramp-Up and Ramp-Down).

    Let me know if you have further questions.

    Under voltage transients_slva643.pdf