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DAC80516EVM: Post Circuit designing for High load ( Low Impedance )

Pallavi Mahanta
Prodigy 10 points

Part Number: DAC80516EVM
Other Parts Discussed in Thread: DAC80516, OPA192, DAC81404

We are designing a circuit to drive a low resistance (few ohms) high load output using dac80516. the DAC output is buffered with OPA192 for precision followed by NPN transistor configured as an emitter follower. The load current ranges from few milliamps uto 1-2 Amperes.
Will this configuration work properly? how can we improve the design to achieve better precision and stability? we are also considering feeding back the transistor output to the op amp for improved accuracy- is this the correct approach?

  • 0
    TI__Guru 56713 points

    Hi Pallavi,

    This should work well.  You could also consider a DAC that features a feedback sense line and you could eliminate the op amp in the design.  A device like the DAC81404 is a good example.  connecting the op amp feedback to load is also a good way to remove some error sources, assuming you have a low offset voltage amplifier (OPA192 is a good fit).  

    Thanks,
    Paul