• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 62 subscribers
  • Views 436 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.

BQ25792: D3 and D7 on BQ25792EVM

Guillaume Nicoud
Prodigy 20 points
Part Number: BQ25792


Hi TI Team,

For an industrial application, i need to use the BQ25792 to manage an emergency backup power supply.

My system uses in Sys output 2A maximum (Input 24V to 12V) , and 1.5A max. to charge a 4S3P Li-ions battery.

I see on your evaluation module (doc. SLUUCB5 of June 2020) for BQ25792EMV that you use two Schottky diode (D3 and D7) which are not present on the datasheet.

What are their uses and are they essential ?

  • 0
    TI__Guru**** 168536 points

    Hi Guillaume,

    The advance product EVM (revision E1) had non-final production silicon and a non-ideal board layout.  We added those two diodes to improve IC performance on this EVM.  The final IC, with recommended layout, will not need those diodes.  The final EVM releases next week without those diodes.  I have attached a pdf of the final EVM layout.  Please follow that layout.  The main difference between the final Rev A EVM and Rev E1 layout is the SWx traces and the ground return for the PMID and SYS caps.  The PMID and SYS caps need to have a very low impedance (small layer as IC with no vias) to their respective pins and GND pin.  This means that the SWx traces need to via down under the IC and then to the inductor.

    BMS034A_TIS_PCB.PDF

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 20 points
    thank Jeff for your reply