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Thread: IRPS5401 won't start / initial bring-up

  1. #1
    New Member New Member GnilCH is on a distinguished road
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    IRPS5401 won't start / initial bring-up

    Hey Guys

    I have this strange problem with all IRPS5401 on our new PC Board. Even though the devices are configured properly, they won't start-up the output voltage when commanded to do so. I checked all external voltages and inputs to the devices and they seem fine. I even extracted the configuration of a running IRPS5401 on a Xilinx FPGA Eval Board and copied it over to one of my IRPS5401 and it still refuses to ramp up the output voltage.
    The copied-over channel even has the very same voltage and current configuration as on the Xilinx eval board and the connections of the IRPS5401 are EXACTLY the same as on the Xilinx eval board as well, so I'm really running out of ideas here and the whole board is dead in the water without the enabling of these power converters =(
    Is there some sort of a safety switch that needs to be disabled first before enabling the device for the first time?
    Do I need to program the configuration into the MTP or can the device run with a temporary configuration programmed by the PowIRCenter into volatile memory?

    I do have other IR-devices on the same board, like IR38060/62/64, which all run fine. Only the IRPS5401 refuses to give in to my commands

    Your help is very much appreciated
    Fabian

    Edit: attached schematic page
    Click image for larger version

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    Last edited by GnilCH; Jul 3rd, 2019 at 04:53 AM. Reason: attached schematic page

  2. #2
    New Member New Member Aef is on a distinguished road
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    Hi to all,

    same problem here!
    We have a carrier board for an UltraZED with two IRPS5401 and they won't to ramp up output voltages. We set them with the DESIGN WIZARD of IR PowIRCenter (build 6834) without any success.

    Your help is very much appreciated.
    Andrea

  3. #3
    New Member New Member nickb is on a distinguished road
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    Can you check the status of the output rails in PowIRCenter?
    Maybe there are overcurrent faults disabling the outputs?

  4. #4
    New Member New Member Edwin is on a distinguished road
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    Hi Folks,

    I believe I have this problem and I have solved it.

    If you have an MTP selection resistor fitted and the selected MTP slot in nonvolatile memory is empty, the part will turn on, respond to I2C commands and hold register values, but will be unable to start any of its switchers regardless of how you set the registers over I2C.

    One of the symptoms of this problem is that in STATUS_WORD, NONE OF THE ABOVE, OFF, and POWER_GOOD# will be set, but none of the other fault flags will be set.

    To unlock the PMIC for configuration over I2C, either write a valid configuration to the selected MTP slot before attempting to control the PMIC over I2C, or remove the MTP selection resistor. (Note that according to the datasheet, this will make the PMIC I2C addr 0Ah).

    Hope this helps. This comes at the end of 2 days of furious headscratching by several engineers over here. This is especially frustrating because the parts arrive blank, and this means that without modifying and un-modifying the board you cannot test the configuration in bringup before writing it to permanent memory.
    Click image for larger version

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    Last edited by Edwin; Feb 6th, 2020 at 08:57 PM.

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