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xiexi
Joined: 14 Jan 2005
Posts: 79
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 09 Jan 2007 7:40 What's the difference between PWM and PFM of Buck |
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| Hello all, now i am an beginner to study the buck, i am confused the difference between these two architectures. Pls give me some instruction or paper, thanks ahead.
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cmosekv
Joined: 26 Apr 2005
Posts: 5
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| 07 Mar 2008 18:52 Re: What's the difference between PWM and PFM of Buck |
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| PWM changes the duty cycle to adjust the output voltage while PFM keeps the duty cycle but changes the frequency to adjust the output voltage.
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ee_ykhab
Joined: 06 Feb 2008
Posts: 26
Helped: 5
Location: HongKong
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| 09 Mar 2008 14:23 Re: What's the difference between PWM and PFM of Buck |
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PFM normally has higher efficiency @ light load.
PWM normally has higher efficiency @ heavy load.
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shaq
Joined: 23 Jul 2005
Posts: 375
Helped: 42
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| 10 Mar 2008 2:03 Re: What's the difference between PWM and PFM of Buck |
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| ee_ykhab wrote: |
PFM normally has higher efficiency @ light load.
PWM normally has higher efficiency @ heavy load. |
How to detect load status to switch from PWM to PFM and vice versa?
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