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Original question:

OPA462: HV power supply from +/-5V or +/-12V

OPA455: About OPA455 Vcc supply questiom.

Jimmy WANG
Genius 4085 points
Part Number: OPA455

Hi team,

As datasheet description, VCC can support ±6 V to ±75 V.  So Does OPA455 can support asymmetric input? example:V+= 75V and V-= -12V. thx 

  • 0
    Guru 140200 points

    Hi Jimmy,

    yes, of course. But read section 7.3.4 of datasheet and adapt the "absolute maximum ratings" given in section 6.1.

    Kai

  • 0
    TI__Guru* 77501 points

    Hi Jimmy,

    As Kai pointed out, asymmetric supply voltage rails are ok to use. 

    For a single supply rail, the recommended max. operating voltage is 2*75 = 150Vdc. 

    For dual supply rails, the delta of supply voltage rails of (V+ -  V-) has to be <= 150Vdc.  In your case, you have 75 - (-12) = 87Vdc, which is well within the recommended supply ratings for OPA455 IC. So you are good. 

    If you have additional questions, please let us know. 

    Best,

    Raymond