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Brad Albing

Switching Regulators: Efficiency & Cost vs. Frequency

Brad Albing
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etnapowers
etnapowers
10/21/2013 5:42:45 AM
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Re: Re : Switching Regulators: Efficiency & Cost vs. Frequency
@Brad , you're right talking about space occupation and cost saving but the switching regulators can have functions like duty cycle regulation or frequency response setup, that linear regulators cannot have. It depends on the application, I fully agree with you.

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B_Albing
B_Albing
9/21/2013 8:21:03 PM
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Re: application design
@etnapowers - again, picking the output cap is just another aspect of doing a power supply design. As is deciding whether its going to be continuous or discontinuous mode.

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B_Albing
B_Albing
9/21/2013 8:15:26 PM
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Re: duty cycle
@etnapowers - yep - just another aspect of the design - setting the output voltage in a closed loop system inherently establishes the duty cycle.

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B_Albing
B_Albing
9/21/2013 8:13:28 PM
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Re: switch design
@etnapowers - Hmm... not sure I know to what you are referring here when you say "no return of power from the load to the power supplier." That would not be an issue in a buck regulator since current won't flow from the lower potential output node to the higher potential input node.

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B_Albing
B_Albing
9/21/2013 8:10:08 PM
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Re: Key factors
And you need to make sure that it does more than just "works on paper." If it is providing the right output voltage, but is generating way too much EMI/RFI, then you don't really have a good design.

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B_Albing
B_Albing
9/21/2013 8:07:47 PM
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Re: Key factors
@etnapowers - yep - you always need to keep the needs of the customer (or the customer's app) in mind.

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B_Albing
B_Albing
9/21/2013 8:05:44 PM
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Re: Switchers require a bit more patients to get to work with low noise
@Will - that's pretty good if you can get the output ripple down that low in a power supply putting out a few watts. Usually you have to follow the switcher with an LDO to get results like that.

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B_Albing
B_Albing
9/21/2013 8:02:45 PM
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Re: Re : Switching Regulators: Efficiency & Cost vs. Frequency
@etnapowers - As you noted, switching regulators are highly efficient. Note however that at very low current draw, the efficiciency difference between linear and switching regulators may be so small as to be inconsequencial. Then other issues come into play - like the fact that the switcher will cost more and take up more PC board space. Just some more issues to deal with if you're the engineer designing the system.

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etnapowers
etnapowers
9/10/2013 8:00:29 AM
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application design
One important phase of the design of a switching regulator is the choosing of load capacitance to ensure low ripple and to determine the mode of operation, whatever continuous or discontinuous

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etnapowers
etnapowers
9/10/2013 7:54:50 AM
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duty cycle
The input-to-output voltage ratio depends on the duty cycle of the switching power device so it is important a proper control of this parameter , this is another important factor to classify the regulators

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