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TPA3255-Q1: Max safe PVDD voltage

Part Number: TPA3255-Q1

Does the PVDD max spec of 56.5 V when RL > 6 ohm also apply to the 3255-Q1? It is mentioned in a note but not explicitly stated the way it is in the original 3255 spec.

We are looking at using the TPA3255-Q1 powered by a "48 volt" battery, which you probably know is actually a bit higher. We typically use a float charger at ~54 volts rather than a boost charger which can be near 58 volts. The battery voltage drops a bit once you put a significant load on it.

We were already planning to use the chip in PBTL config into a single 4 ohm load (nominal ~200 watts) to ensure we could handle the heat in a worst case application. I'd like to confirm that we can safely operate at 54 volts at reduced load and an OC_ADJ resistor value of 30 K.

Thanks,

Kevin Cassidy

  • Hi Kevin,

    We didn't validate the case where PVDD = 56.5V when there's a load of 6ohms for the TPA3255-Q1. So while you can try to use in this application we can't guarantee the performance of the device while be automotive compliant. 

    Best Regards,

    Robert Clifton