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BOOSTXL-DRV8301 modifications for 48V

Other Parts Discussed in Thread: BOOSTXL-DRV8301

Could someone please provide me some Pointers on how to modify the BOOSTXL-DRV8301 Board to support 48V Input Vortage?

I'm somehow stuck on not seeing the essential differences between the diverse Reference schematics...

thanks

  • Hi Anton

    You should check and choose MOSFETs and Caps with higher than your 48V level and better with proper margin. Please also check the BOM for the detailed components parameters.

    The software may need some parameters changes as well to adapt the 48V running.

    Best Regards,
  • Hi Anton and e2e community,

    I want achieve the same goal as you. Have you done it? I have some Idea and some questions.

    Looking at the schematic http://www.ti.com/lit/df/tidr542/tidr542.pdf and on the material bill http://www.ti.com/lit/df/tidr541/tidr541.pdf I think there are these components to change to be able to use the boostxl with 48V.

    - the resistor in the voltage sensing (R22 R38 R40 R42) have to be changed to a lower value. A value of about 2k should be ok.

    - capacitor c5 c6 c7 (c10 buck) are rated at 50V. Is this ok?

    - the resistor R23 has to be changed maybe to a higher value.(but it is unimportant)

    - the electrolytic capacitor c20 c21 need to have higher voltage rating. At least 60 V. Here I have a question. Which is the rule to choose the capacitive value of these capacitors? It is ok to remove those capacitor and replace it with a bigger one (1000uF) mounted direct on the PVDD input wires?

    - The mosfet in the bosst xl are rated for 60 V and this should be ok.

    - the step down has to be tested. For this I look at 8.3.3 of www.ti.com/.../drv8301.pdf which refer to www.ti.com/.../tps54160.pdf . It could be that the inductor L1 and the resistor R11 has to be adapted. I tried to calculated the max switching frequency for 54V and I get a value of about 620kHz which is a about the value for the R11 value at 207k. The minimal inductance for this frequency is still ok (I think) but if you reduce the frequency (which I think is better) a bigger inductance has to be chosen. Can someone give some help?

    I found many information on the reference guide http://www.ti.com/lit/pdf/tidu708 (a very similar power stage) and on the boostxl user guide http://www.ti.com/lit/ug/slvu974/slvu974.pdf

    thanks for any hints

    Enzo

  • if you double the voltage you need to have the current to fit the same thermal footprint.
    there is a new 48V BOOST coming out in a couple months...and some even higher current TI Designs (not actual hardware, just design files).
  • Hi Chris,
    it sounds very interesting with the new products. So, in other words you say that it make no sense to try to modify the boost xl, or it is possible?
    second can you explain if I double the voltage what would be the current ratings (rule of thumb)?
  • sure it's possible.
    the version being released in a couple months is essentially that, but with a larger PCB to handle the additional power dissipation.

    if you double the voltage you should plan to halve the current sense to maintain same rated power.