Opamp with 1A output current required

HARI T O1

Expert 1645 points

Other Parts Discussed in Thread: LM317, OPA567

Dear Team,

I need an opamp with 1A output current(max) for my circuit.

The opamp will be used as a unity gain buffer. Could you please suggest one. Below is my circuit.

Regards

HARI

over 4 years ago

0 Dingmin Xu over 4 years ago

Intellectual 490 points

Hi,

Can you give more information about your application? Like output range, frequency, SNR, load or someting.

Thanks!

0 Clemens Ladisch over 4 years ago

Guru 316440 points

See the list of power op amps: www.ti.com/amplifier-circuit/op-amps/power/products.html#p480=1;1&p233typ=1000;10000

What is the supply voltage, i.e, how much power do you need to dissipate inside the device (1 A * VCC/2)? Most devices will have a problem with a DC current of 1 A, and are likely to require active cooling.

0 Ron Michallick over 4 years ago

TI__Guru**** 164456 points

Hello Hari,

If output current always flows out of the op amp, add an NPN or NMOS transistor

For VOUT = VIN + 1.25V , try LM317

If you need something else, what is the voltage for VIN and U1 power?

0 HARI T O1 over 4 years ago in reply to Ron Michallick

Expert 1645 points

Hi Ron,

Thank you.

Vin varies from 0.8V to 1.8V

At present we have a 5V supply available in the board.Planning to use the same for powering U1

Regards

HARI

+1 Ron Michallick over 4 years ago in reply to HARI T O1

TI__Guru**** 164456 points

Hari,

If output current only flows one way then the transistor will boost the current. If you need bidirectional output current then a different solution will be needed.

OPA567 is an option.

Amplifiers

Amplifiers forum

Opamp with 1A output current required