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edwintsu
Joined: 24 Mar 2005
Posts: 84
Helped: 7
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 09 May 2008 10:16 Question about load step response in buck converter |
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What decide the output voltage spike in load step?
My spike is 2 times than the spec. I try some methods, but little efficient.
Thanks for your reading!
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ashish_chauhan
Joined: 02 Sep 2007
Posts: 229
Helped: 37
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| 09 May 2008 10:27 Re: Question about load step response in buck converter |
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How did you calculate the size of output capacitor. It plays amajor role in deciding the magnitude of voltage spike...
Visit TexasInstruments site ... there you shall find some useful documents related to ur question.
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edwintsu
Joined: 24 Mar 2005
Posts: 84
Helped: 7
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| 09 May 2008 10:48 Question about load step response in buck converter |
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Thank you.
I design a PIN-PIN product, so can't change the output capacitor. Only change the internal circuit param.
What should i modify? EA gain, gm, or some else param?
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ashish_chauhan
Joined: 02 Sep 2007
Posts: 229
Helped: 37
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| 09 May 2008 10:54 Re: Question about load step response in buck converter |
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increase the gain of error amplifier... this should help.
so you dont have a control on inductance value as well ... right??
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edwintsu
Joined: 24 Mar 2005
Posts: 84
Helped: 7
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| 09 May 2008 11:02 Question about load step response in buck converter |
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I will try it.
U'r right. Best don't change any external component.
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ashish_chauhan
Joined: 02 Sep 2007
Posts: 229
Helped: 37
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| 09 May 2008 12:14 Re: Question about load step response in buck converter |
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Then it might turn out to be abit difficult ... bcoz we generally decide values of output cap and inductor based on ripple voltage and current... so you have free the things at one of the sides ... but ur trying to hold the both!!!
Added after 1 hours 7 minutes:
hope you were able to save ur fort by tweaking amplifire gain...
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poweric
Joined: 29 Oct 2006
Posts: 68
Helped: 3
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| 10 May 2008 16:00 Question about load step response in buck converter |
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you can increase the the compensation of the loop try
if the out device have no problem
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edwintsu
Joined: 24 Mar 2005
Posts: 84
Helped: 7
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| 12 May 2008 7:59 Re: Question about load step response in buck converter |
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| ashish_chauhan wrote: |
Then it might turn out to be abit difficult ... bcoz we generally decide values of output cap and inductor based on ripple voltage and current... so you have free the things at one of the sides ... but ur trying to hold the both!!!
Added after 1 hours 7 minutes:
hope you were able to save ur fort by tweaking amplifire gain... |
Thank you. I know the fact, and now run up the gain.
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