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TAS3251: PVDD_X DC supply

Mark Thompson2
Intellectual 630 points
Part Number: TAS3251
Other Parts Discussed in Thread: PMP10215, , PMP40379

Hi there,

I'm working on some designs using the TAS3251 amplifier, and have hit a snag.  There don't seem to be many readily available 240V AC to 36V DC supplies so I can supply this as PVDD.  Can you please help me with either:

  1. Sourcing some readily available 240V AC to 36V DC power supplies that are suited to driving this amplifier, or
  2. Assist me with a design to build a power supply that can achieve this?

Thanks for your assistance.

Regards,

Mark

  • 0
    TI__Mastermind 19080 points

    Hi Mark,

    Well, I guess you would like to build a on-board AC-DC power supply circuit, so the massive AC-DC power supply modules may not be suitable for you.

    I'm passing this question to our power management products team. They will give you the right answer.

    Thanks!

    Regards,

    Sam

  • 0 in reply to Sam(MPAA) Zhang
    Intellectual 630 points

    Thanks, Sam.  That makes sense.

    Having said that, I just come across the PMP10215 design on your website.  Would this be an appropriate solution?

    Cheers,

    Mark

  • 0 in reply to Mark Thompson2
    TI__Expert 7395 points

    Mark,

    Thanks for your interest in TI here.

    What power do you need out of the 36Vout? Any special specs required in the power supply itself in terms of regulation, ripple, or similar?

    Regards,

    John

  • 0 in reply to John Stevens
    Intellectual 630 points

    Hi John,

    I have to be honest here, power supply spec's aren't my specialty.  However, to give you some context.  I'd like to build a power supply to power the TI TAS3251.  Noise floor is paramount.

    I've spotted the PMP10215 design, which looks like a good start for me (although I don't need the 400V output stage).

    What other information can I give you so that you can help me get started with a design?

    Kind regards,

    Mark

  • 0 in reply to Mark Thompson2
    TI__Expert 7395 points

    Mark,

    1) what is the product you are building? Does it require harmonics limits on the AC input that could require active power factor correction (PfC) ?

    2) what is the full input voltage range? 36vdc is the true minimum voltage or there is variation above and below that? 240vac is true maximum or there is variation above that?

    3) what is continuous output power requested?

    4) what is peak (momentary) power and for how long in time does it need to provide that leak power?

    Regards

    John

  • 0 in reply to John Stevens
    Intellectual 630 points

    Hi John,

    1.  Effectively it would need to be capable of driving the TAS3251 as it is setup on the TAS3251EVM Evaluation Board.  I need a 36V, 12V and a 3.3V supply for that amplifier.  I'm happy to concede 3.3V and use an onboard LDO from the 12V supply if need be.

    2.  240V AC is true maximum input supply voltage to the amplifier.  36V DC (must not exceed 38V) and a separate 12V DC (must not exceed 13.2V) required.

    3.  based on the spec' for the TAS3251 and driving 2 x 4-ohm loudspeakers per amplifier, then having this power supply drive up to 3 x TAS3251 amplifiers.  Each amplifier channel may deliver up to 175W to the 4-Ohm loudspeaker load.

    4.  Ideally a 12dB crest factor for 1ms.  But we can compromise on this.  Happy to take your guidance based on your work on other audio based solutions here.  Thanks.

    Kind regards,

    Mark

  • 0 in reply to Mark Thompson2
    TI__Expert 7395 points

    Mark,

    Thank you for the further details here. Let me dig around a little bit. I'm going to ask another engineer to comment further as well. Please expect a response from him by Monday at the latest as he explores the best options.

    Regards,

    John

  • 0 in reply to John Stevens
    Intellectual 630 points

    Thank you, John!  That's great.

  • 0 in reply to Mark Thompson2
    TI__Expert 7395 points

    Mark,

    No worries at all. Will update soon. :)

    -John

  • 0 in reply to John Stevens
    TI__Intellectual 1200 points

    Mark,

    I do believe PMP10215 is the best reference design you can leverage for your design since it provides you with the 36V,12V,and 3.3V rails you're looking for. It's rated for 200-W and has a peak power rating around 840W, so I think it should be ok. 

    We also have some other audio amplifier reference designs which are rated for higher power and achieve better efficiency like the PMP5327 and PMP40379, but these would require some modifications to create the 36-V rail, and then downstream bucks/LDOs to generate your 12V and 3.3V rail (note the PMP5327 does have a 12-V/250mA rail). 

  • 0 in reply to Blake Soileau
    Intellectual 630 points

    Many thanks, Blake!  That's very helpful.  I might come back and ask you about modifications to achieve a higher power output once we finalise the amplifier designs.  It would be nice to drive all amplifiers off a single power supply, or perhaps find a way of integrating two-in-one (so to speak).

    Kind regards,

    Mark