High current output circuit from 12V power supply

Wyman Wong,

TI does not have high speed op amps with 2A output. The closest I can think of to what you ask for is the OPA2673. It is a dual op amp designed for power line modem application and can drive up to 700mA per op amp. You will need to parallel devices in order to get 2A or use a lower power device to drive a FET or other transistor capable of delivering 2A.

I will move this message to the precision forum because they have some higher output current devices and an expert there may be able to give you a better solution.

Wyman;

Jim is unaware of the line of very nice power op amps that TI offers-- this is not surprising since the TI website makes them impossible to find.

I have attached a circuit using an OPA548 that can do what you asked. You did not specify the gain so I arbitrarily set it at -1V/V. The OPA548 delivers 5V into a 2.5 ohm load so that's 2A. Note that it will require a heat sink to dissipate this significant power.