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TPS54260 in No load condition.

Amey Kulkarni
Prodigy 90 points
Other Parts Discussed in Thread: TPS54260

Hello;

        I am  thinking of using TPS54260 for one of my inverting switcher application. Following are the requirements:

1> Vin:24V

2>VOUT=-24V.

3> I.Load:800mA

Load current varies from No load (0mA) to 800mA with a transient peak of 5A.

So my query is  does the switcher has any issues at no load condition and also is there any issues with switcher for high peak current for short duration?

Waiting for reply.Thanks

 

  • 0
    TI__Guru 66820 points

    Hi Amey, 

    While the TPS54260 could be used in an inverting buck/boost topology, it is important to note that there are additional factors that need to be taken into account compared to the non-inverting buck converter. 

    Most importantly is the current through the inductor is approximately 2 times the output current when operating at a 50% duty cycle, as proposed. This means an upward of 10A would need to go through the part during a 5A transient. The TPS54260 has a current limit of 3.5A, therefore would not be sufficient for this application. 

    For additional considerations for creating an inverting supply from a step down converter, see SLVA317B.

    Best Regards, 

    Logan