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TPS63001 power save mode

shahbaz sarik
Prodigy 200 points
Other Parts Discussed in Thread: TPS63001, TPS63051

Hi,


I am using TPS63001 to drive my load, load has the following current rating:

60mA for first 180sec

12mA for next 180sec

4mA for next 54 minutes

and this process repeats.

when I am driving my load with power save mode disabled (PS/SYNC connected to Vin) the I am getting the desired output but when I am driving it with power save mode enabled (PS/SYNC connected to GND) then the output has huge amount of noise. what can be the possible reason?

How is lighter load defined quantitatively for TPS63001?

For power save mode the no load currents comes around 60 - 80uA but for pover save mode disabled it is around 3-5mA, why this huge change is observed?

Thanks,

Shahbaz sarik

  • 0
    TI__Expert 7110 points
    In Power Safe (PS) Mode, the device just switches once the output voltage falls below a certain threshold. Please see page 12 of the D/S - here the PS Mode is explained. This leads to a higher ripple at the output. This is shown in Figure 8 to 11 (page 8).

    With huge amount of noise, do you mean a ripple as shown in Figure 11?

    The device draws more current in Forced PWM Mode, as it has to switch all the time, even if there is no load applied. The current you see reflects mainly all the dynamic losses in the power stage. This is why a PS Mode is implemented.

    Have you considered to use TPS63051, which has a better ripple performance in PFM?