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OPA340 Negative output on negative input with single supply

Tico ti
Prodigy 130 points
Other Parts Discussed in Thread: OPA340

Hi guys! we're working on OPA340 for an rectifier. We config it as a superdiode with single supply, but when we apply a negative voltage to the positive input, the output reflects the negative inout voltage (up to 10mV). We're surprised with this behaviour. Am I missing somethig?

SUPERDIODO-RS_TI.TSC

I enclose a simple Tina simulation with this.

Regards,

  • 0
    TI__Guru 64290 points

    Vicent,

    The 10mV error in the output swing is the result of macro-model trade-off.  Since the typical load for OPA340 is 10k, using no resistive load like in the circuit above causes in simulation the output voltage swing error you see.  In reality, OPA340 will swing at the output under the conditions shown within 1mV above the negative rail - see below.