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LM5060: Choosing Ro in a large capacitance load application

Prodigy 30 points

Replies: 5

Views: 65

Part Number: LM5060

The datasheet mentions that in the case of a large capacitive load, you might need  to add a series resistor to the Out pin. The section is a little confusing to me. They listed 4 scenarios.

My application has a large capacitive load and I'm not expecting reverse polarity at the input. 

Do I need an Ro ? and if yes , how do I calculate the right value ?


Thanks

  • Guru 52285 points

    Hi Vi,

    Can the capacitance, operating voltage and max load current details.

    What is the application use case?

    Best regards, Rakesh

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  • In reply to Rakesh:

    Hi Ramesh,

    28v , about 1000uF , 2-3 amp  current pulses to drive lasers.  

  • Guru 52285 points

    In reply to Vi Lu1:

    Hi Vi,

    Please use Ro as per Equation-(18) in LM5060 datasheet.

    LM76202-Q1 would be good option for your target specs.

    Best regards, Rakesh

    --------------------------------------------------------------------------------------------------------

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  • In reply to Rakesh:

    Hi Rakesh,

    In this equation , Vout>Vin what would be my Vin to plug into the equation ? Is it my UVLO ?

  • Guru 52285 points

    In reply to Vi Lu1:

    Hi Vi,

    Taking Vin = 0 considers worst case because in case there is any load at Vin which discharges Vin to zero else VIN_UVLO value can be used for calculation.

    Best regards, Rakesh

    --------------------------------------------------------------------------------------------------------

    To find the latest information on Power Switches, Visit www.ti.com/powerswitch 

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