[SI-LIST] Re: Experience with Power supply collapse on boards due to excessive decoupling.

Vipul,

You should check your power supply design (assuming a switching supply) 
1. stability, compensation values, phase and gain margin
2. Current limiting value of the supply 
3. Proper Layout 

Any of the above issues can give lot of grief in terms of oscillations, rail 
collapse and noise. 240uF is not lot of capacitance. 

Regards,
Prasad


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of Vipul Badoni
Sent: Tuesday, November 25, 2008 2:18 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Experience with Power supply collapse on boards due to 
excessive decoupling.

Hello SI-Folks,
 

I was wondering if some of you could share with me your experiences with power 
supply collapse due to excessive decoupling of only a few values of capacitor 
on boards drawing a lot of switching current. The situation I am dealing with 
has ~400 in number of 0.1uF caps and ~200 in number of 1uf caps. The power 
supply shows a lot of noise ~400mV. 

 

Regards,

Vipul Badoni.

 


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