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PGA460-Q1: Any consideration to limit the supply input for the transformer topology to 15V ?

PYTsai
Genius 9315 points
Part Number: PGA460-Q1

Hi 

May i know is the consideration why limit the supply input for the transformer topology to 15V ? 

if use 28V for the supply input for the transformer topology, what problem will it caused ? 

  • 0
    TI__Expert 6855 points

    Hi PYTsai,

    Our team is currently out for the Thanksgiving holidays.  We should be able to look into your question again when we are back on Monday.

    Thank you,

    Mekre

  • 0 in reply to Mekre Mesganaw
    TI__Mastermind 19630 points

    Hello PYTsai,

    Thanks for posting to the sensing forum. The max 15V recommended operation for the VPWR pin in a transformer driven system is due to the voltage on the OUTA/B pins being double the center tap voltage during a burst. For example if we give the center tap 15V then during a burst they will generate up to 30V on OUTA/B, if you provide 28V for the VPWR pin and to the center tap then the voltage during  a burst will be up to 56V on the OUTA/B pins.

    The OUTA/B pins are only rated up to 30V hence why we have the 15V recommendation, using a voltage higher than the recommended can damage the OUTA/B pins of the device. If you need to supply the devices VPWR pin with 28V then this can be done just ensure to separate the supplies for VPWR and  the supply transformer center tap with a different voltage to avoid damaging the devices output stage.

    I hope this answers your question!

    Best,

    Isaac