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TI Home » TI E2E Community » Support Forums » Power Management » Non-Isolated DC/DC » Non-Isolated DC/DC Forum » tps63020 Vout deviation in power save mode
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Captured to TPS63020 Vout deviation in power save mode wiki page Recapture

tps63020 Vout deviation in power save mode

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Kocela Chang
Posted by Kocela Chang
on Apr 28 2011 10:56 AM
Intellectual280 points

Hi:

Sorry need you guys help.

1. Could you provide Vout’s deviation in power save mode?

2. Do you have formula about estimating Vout range in power save mode?

3. Why Vout in save mode is a little higher than PWM mode's?

please see sheet2

2061.tps63020 issue.xls

thanks

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  • Daniel Acevedo
    Posted by Daniel Acevedo
    on Apr 28 2011 13:14 PM
    Verified Answer
    Verified by Anonymous
    Genius16810 points

    The TPS6302x is expected to have a higher output voltage in power save (PFM) mode. 

    This prevents the output voltage from dipping below the set output when a load is applied. 

    In PFM mode, the feedback is between two points near  .500V and .525V  which is why the average output is measured at .512.

    I have measured this on an evaluation module with no load to demonstrate. The results are visible in the following scope shot:

    TPS63000 TPS63020 tps63010 TPS63030 ripple TPS63031 TPS63001 TPS6302x TPS6300x TPS6301x TPS630xx TPS6303x TPS63021 .512 Power Save PFM .51
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  • Daniel Acevedo
    Posted by Daniel Acevedo
    on Apr 28 2011 13:22 PM
    Verified Answer
    Verified by Daniel Acevedo
    Genius16810 points

    Though we don't have a formula for estimating Vout range in power save mode (PFM), I recommend designing for significant margin using 25mV as the range on Vfb for PFM. 

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  • Daniel Acevedo
    Posted by Daniel Acevedo
    on Apr 28 2011 17:23 PM
    Verified Answer
    Verified by Daniel Acevedo
    Genius16810 points

    The other possibility is to operate in PWM mode where Vfb is specified in the datasheet to be 495-505mV. This will however decrease your efficiency at loads less than approx. 100mA.

     

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  • Kocela Chang
    Posted by Kocela Chang
    on Apr 28 2011 20:40 PM
    Intellectual280 points

    Daniel:

    thanks for your detail explanation

    do you have the presentation about this PFM principle?


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