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PTN78020W: Driving two PTN78020W's with a single power supply output

Part Number: PTN78020W
Other Parts Discussed in Thread: TPSM53602

Hello all,

I am in the design process right now and I am curious: Could I drive two PTN78020's with a single power supply and get decent results? Say I have one set up to output 3.3V and the other set up for 5V. If I drive both with a 20V @ 2.5A signal, could expect to get ~1.25A output from both? Is there anything I could do to assure that something close to that would happen? Or would I have to use a separate power supply to drive each PTN78020W?

Thank you,

Cole

  • Hi Cole,

    You can drive multiple different switching regulators from the same input power source. So long as the input supply can handle the current load from each downstream switching regulator, I don't see any issue with having a single input power source. 

    The efficiency graph in the datasheet should help provide insight on the typical expected performance of the part at different VIN,VOUT,and loading. You may be interested in looking at the typical efficiency characteristic at 24Vin

    If there a reason why you are looking at a 6A part for a 1.25A loading condition? If you want better efficiency at that loading, perhaps you can look at the newer power modules such as the TPSM53602. For 24Vin at 1.25A, the TPSM53062 can be expected to get efficiencies in the upper 80s compared to the PTN78020W. Refer to Figure 6-11 for more details. 

    Regards,

    Jimmy