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LM2596 at 100% duty cycle

digambar bendale88
Prodigy 40 points
Other Parts Discussed in Thread: LM2596

Can we operate LM2596-adj at 100% duty cycle.

In datasheet sction 7.9  Electrical Characteristics- All output versions : Max duty cycle=100% , when we connect FB pin of this IC to ground it will operate at 100% duty cycle.

Has anyone tested it?

  • 0
    TI__Expert 3870 points

    Hi,

    In a closed-loop environment, FB pin connected to VOUT, yes the LM2596 has the capability of operating at 100% duty cycle.  Take a look at Figure 6 for the expected Dropout Voltage (Vout = Vreg - 50mV) for the given inductor Rind (DCR) value. 

    In an open-loop environment, FB pin not connected to VOUT and connected to 0V or ground, it'll also force the 100% duty cycle condition.  Take a look at Note (5) of the EC table.

    So yes, this condition has been tested.

    Best Regards,

    -JP