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Paralell module co-existance, PTH08T240W

TIguru
Expert 1430 points
Other Parts Discussed in Thread: PTH08T240W, PTH05T210W

Hi,

    I am using PTH08T240W in parallel with another TI module (PTH05T210W ) but I only want one or the other to drive voltage into my 1.0V rail.  We are using the inhibit pin in PTH08T240W to turn off its output while using the second module.  We are getting brownouts on the output voltage. My question for you is can the two modules  co-exist if one of the two is being inhibited? or will the output of the inhibited module present a load that will cause the second to misbehave?

Please advise.  Your help will be greatly appreciated.

Regards,

TG

  • 0
    TI__Genius 14317 points

    From page 30 in the PTH08T240W Data Sheet:

    "The PTH family of power modules incorporate synchronous rectifiers, but does not sink current during startup or whenever the Inhibit pin is held low"

    Based on this, I think it should be OK barring any startup condition issues (see pg. 30 of the Data Sheet) but I'll defer to the specific device apps. folks.

  • 0 in reply to Jeffery Pfarr
    TI__Mastermind 38230 points

    PTH0T2 modules cannot be parallelled  or co-exist  if one is being inhibited. Diode isolation  or any other series  control function is not recommended as the losses (VF) are too significant for this low voltage ( 1.0V)

    Remote sense must not be used to compensate for forward conduction (VF) losses as this can force the unit into an open loop operation.

    Tom

  • 0 in reply to Tom Guerin
    Expert 1430 points

    Thank you for the quick response Tom.  Your help is greatly appreciated.