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High output current modulation from low analog current input

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Meach_bzh

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Hello,

My goal is to get an output current DAC that can generate up to 400mA, very fast and at low power.
Since getting such current out of a DAC is not recommended, I want to use an external high speed high current op-amp to generate the wanted current.

What I have now is:
- A DAC that can generate from 1 to 5mA.
- A 400mA current amplifier.

Does anyone know a good idea to have an output current that can be from 0 to 400mA, by using as "modulating" input the 1-5mA current from the fast DAC?

I am looking for any good ideas and don't hesitate to ask if you have any question.

Thank you,


Meach_bzh
 

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