OPA548: OPA548 about the asymmetry operating voltage

Part Number: OPA548

Hi Team,

The customer is using OPA548.

Can  OPA548 be used the asymmetry operating voltage to design the circuit?

Or can OPA548 only be used the symmetrical operating voltage to design the circuit?

If  OPA548 can be used the asymmetry operating voltage to design the circuit,  compared with the symmetrical operating voltage situation,

what impact will this bring about?

Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments

2 Replies

  • Hi Mickey,

    Yes, the OPA548 certainly can be powered with asymmetric power supply levels. The thing to make note of is the input and output ranges will be relative to whatever V+ and V- are set to.

    For example, if the OPA548 is powered by a V+ level of +25 V, and V- level of -5 V, the input and output ranges would be determined as follows:

    Common-Mode Voltage

    Positive Linear Operation (min)       (V+) – 3 V = (+25 V) - 3 V = +22 V

    Negative Linear Operation (min)      (V–) – 0.1 V  = (-5 V) - 0.1 V = -5.1 V

    OUTPUT Voltage

    Output Positive (min), IO = 3 A        (V+) – 4.1 V = (+25 V) - 4.1 V =  +20.9 V

    Output Negative (min) IO = –3 A      (V–) + 3.7 V = (-5 V) + 3.7 V = -1.3 V

    The electrical performance of the OPA548 should not change significantly with supply levels that are different than the Vs = +/-30 V listed in the Electrical Characteristics tables.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • In reply to Thomas Kuehl:

    Hi Thomas,

    OK. Thank you.