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
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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 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