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UA78M: Power LDO selection

Dheeraj yadav
Intellectual 630 points
Part Number: UA78M


Hi, 

can I use this LDO UA78M33CDCYR after transformer output and use this 3.3V to power up opamp SI8920BC-IP.

https://www.ti.com/lit/df/tidrzh1/tidrzh1.pdf?ts=1595313548751&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTIDA-010048 

  • 0
    TI__Guru 50190 points

    Hi Dheeraj,

    It looks like you have 28VIN and 3.3VOUT. Looking at the Op-amp datasheet the total input and output current is around 10mA.  So the power dissipation would be around 250mW which should be OK. 

    I hope this answers your question.