THS3491: What is the maximum output current drive capability of THS3491 feedback amplifier?

Radhakrishna Pani

Part Number: THS3491

Tool/software:

In the datasheet there is a ambiguity about the maximum output current drive capability of the THS3491 amplifier.

In "Section 1: Features" it is mentioned that "Linear output current: ±420 mA (typical)" while in "section 8.1 Absolute Maximum Ratings" it is mentioned that "Continuous output current of ±100 mA" with a clauses of "Long-term continuous current for electro-migration limits".

I would like to know can I use THS3491 amplifier to supply my application with 400mA of load current for 3 to 4 hours continuously, then turn it off for 30 mins and again load it for 3 to 4 hours with 400mA load current?

Thanks in advance for your response.

Regards,

Radhakrishna Pani

3 months ago

0 Radhakrishna Pani 3 months ago

Prodigy 10 points

I would like to add few more details:

1) Supply voltage is ± 12V or ±15V

2) The output can swing swing between ±5V

+1 Ignacio Vazquez Lam1 3 months ago in reply to Radhakrishna Pani

TI__Genius 16565 points

Hi,

That is a good question. The abs max spec like you mentioned is under the assumption the device will be driving 100mA continuous current long term. Long term in this case refers to a year plus of run time. A few hours should not be a concern in this case. The concern in this case would likely be maintaining the die temperature within the recommended range. Cooling the device would be the most important consideration.

Best Regards,

Ignacio

0 Radhakrishna Pani 3 months ago in reply to Ignacio Vazquez Lam1

Prodigy 10 points

Thanks Ignacio, we will consider adding a heat sink to dissipate the heat.

Amplifiers

Amplifiers forum

THS3491: What is the maximum output current drive capability of THS3491 feedback amplifier?