TPA3255: DC operation in SE mode

first_name last_name

Part Number: TPA3255
Other Parts Discussed in Thread: TAS5261,

Tool/software:

Hello,

I have to replace TAS5261 with TPA3255. TAS5261 was used to drive loads like heating or peltier elements. In BTL mode I made a test and connected DC directly to INPUT_A and INPUT_B. I figured out that with an offset of about 3.8V to the inputs and a differential DC signal I get the expected result at the output (with low load). E.g. INPUT_A 3.7V, INPUT_B 3.9V). As the datasheet says I expect a shut down at higher loads. Is it possible to use this chip in SE mode to drive such a load with higher current as 1.5A? Is there any risk to use it in such a way?

Best regards,

Manfred

4 months ago

0 Sydney Northcutt 4 months ago

TI__Genius 17960 points

Hi Manfred,

Single ended mode turns off the DC output protection, so it may be possible but keep in mind this device was not designed nor validated with DC input signals and we actually recommend DC filter caps on the inputs.

I recommend getting an EVM and testing with low levels and slowly working your way up. I don't see power being a limiter factor here. The device is more than capable of 1.5A.

Regards,
Sydney Northcutt

0 first_name last_name 4 months ago in reply to Sydney Northcutt

Prodigy 20 points

Hi Sydney,

thanks for the feedback. Can I expect that the input offset of about 3.8V will be in the same range with different batches of the IC, like a bad OPV with about +-50mV?

Best regards,

Manfred

+1 Jesse Ji 4 months ago in reply to first_name last_name

TI__Mastermind 20251 points

hi Manfred

i am afraid that we don't have that kind of statistic data as we haven't use this amp like this intently.

thanks

jesse

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TPA3255: DC operation in SE mode