Could you tell me the diodes spec about 249_HV_EVM

[khlee]

Hello

i develop the step motor drive using TMC249 and TMC249 HV EVM board

Logic Power is 3.3V
Motor Power is 40V, 4A
FET : FDD8824

i bougth the TMC249_HV_EVM Board
i will use 40V motor power - VM
i want to know the D602, D604 spec.

please let me know the principle of the EVM circuit.

thank you .
have nice day!!

[TRINAMIC_BD]

Hello,
thank you for your request - when you use the FDD8424, which works with up to 40V, there is only the need for a small voltage shift between TMC249 and the MOSFET, because the TMC249 can sustain 36V maximum. A simple zener diode shifter does the job- please see here in the FAQ document on page 6. The left schematic corresponds to the TMC249-HVHR-EVAL Board. For 40V target voltage, you can work with BZV55C5V6 diodes. These 5.6V zener types provide the best thermal stability. The TMC249-HVHR-EVAL uses BZV55C12 to support a voltage up to 48V.

With best regards from Hamburg.