Tool/software:
Hello,
We are using a TPS40428 in multiphase output with a pair of CSD95378B devices to drive an FPGA core voltage at 0.75 Volts, pretty much per the schematic in the datasheet.
I am testing the PMBUS READ_IOUT command, and I am getting a value of 1 A (read value was 0xE010). I am expecting it to be closer to 10 Amps. 1 AMP is too low.
I believe the PMBUS transactions are OK, as when I read the output voltage, I get 0.748047 volts and I am able to properly read the VOUT_COMMAND register, etc.
I have checked that the IOUT_CAL_GAIN register is set to 0.5 mOhm (0x8021).
Is there something I should be checking on the schematic?
Thanks,
Mike