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TPS7H4003-SEP: Reason for parallell diodes in reference/EVK design?

Alex Wege
Prodigy 10 points
Part Number: TPS7H4003-SEP

Tool/software:

What is the reason for having parallel diodes in the buck design on the EVK?
The datasheet highlights the importance of a Schottky diode to reduce noise, but gives very little info about the how & technical background, and especially doesn't suggest using two diodes.

While most of the current should be passing via FET on the chip, is there still any concern over unequal load sharing between the two diodes, or even worse, thermal runaway?

  • +1
    TI__Mastermind 28645 points

    Hey Alex,

    The diodes only conduct during the dead time of the device.
    Thus they are only on for a short period of time, but RMS currents can get somewhat high.
    With the dead time estimated around ~110 ns, with an 18 A output the current rating of the diode can come into play

    It is not required to use two, the EVM uses two as a testing platform if they are required by a customer.

    Unequal sharing may happen, but again the use of two diodes is not required.
    A single diode with enough current rating could also be used.

    Thanks,
    Daniel