TPA3138D2: Minimum load

Kuramochi Tadahiko

Guru 28715 points

Part Number: TPA3138D2

Hi,

The minimum load is specified as below;

On the other hand, TPA3138D2 can set PLIMIT, and this limit voltage as virtual-rail.

Can we consider that the minimum load is 1.6Ω if the virtual-rail is set below 10V?

Best Regards,

Kuramochi

over 5 years ago

0 Matthew Miao over 5 years ago

TI__Expert 6720 points

Hi Kuramochi,

As for 1.6ohm case, do you expect TPA3138D2 output as PBTL (mono) or BTL (stereo)?

Regards

0 Kuramochi Tadahiko over 5 years ago in reply to Matthew Miao

Guru 28715 points

Hi Matthew-san,

Thank you for your response.

The output is PBTL.

Best Regards,
Kuramochi

0 Matthew Miao over 5 years ago in reply to Kuramochi Tadahiko

TI__Expert 6720 points

Hi Kuramochi,

Got it. Datasheet specify 1.6ohm min load with PBTL mode 10V PVDD case. Your question is speaker load variance, right?

What's more, PLIMIT does help limit RMS output power to avoid over-current protection trigger. However, another main concern is peak current during startup or inductor ripple current.

So our suggestion with min load is to use larger inductor to reduce peak or ripple current.

Regards

0 Kuramochi Tadahiko over 5 years ago in reply to Matthew Miao

Guru 28715 points

Matthew-san,

Thank you for your reply.

>Your question is speaker load variance, right?

No, I don't concern about speaker load variance now.

I would like to know if a 1.6Ω load is allowed at VCC>10V by PLIMIT.

Best Regards,

Kuramochi

0 Yanming Gong over 5 years ago in reply to Kuramochi Tadahiko

TI__Mastermind 19860 points

Hi Kuramochi,

TPA3138 overcurrent is 3.5A. You can use PVCC>10V @1.6ohm case by PLIMIT if it can touch overcurrent threshold.

Regards,

Derek

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TPA3138D2: Minimum load