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bittware
Joined: 03 Apr 2004
Posts: 208
Helped: 1
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 15 May 2006 7:28 switching regulator output ripple |
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Hello experts,
I got a buck DC/DC switching regulator with wide output voltage adjustable range. I was wondering if output voltage level has relationship with output voltage ripple (absolute peak-to-peak value) assuming input DC voltage levels are the same and with zero ripple.
Thanks for your prompt.
Best regards,
bittware
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15 May 2006 7:28 Ads |
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Miguel Gaspar
Joined: 06 Mar 2006
Posts: 391
Helped: 36
Location: Culiacán, Sinaloa, Mexico
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15 May 2006 15:40 ripple voltage from dc regulator |
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| Usually in design the peak to peak value is not used to design, the Vrms is the value used. That is because there are more signals that afect the output (PARD).
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vicky
Joined: 11 Aug 2004
Posts: 240
Helped: 19
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15 May 2006 19:25 ripple voltage level measurement requirements |
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HI DEAR,
YES THE RIPPLE DEFINATELY HAVE RELATION WITH VOLTAGE RANGE CRITERIA.
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Borber
Joined: 01 Jan 1970
Posts: 1561
Helped: 117
Location: Slovenia
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15 May 2006 20:04 output voltage ripple in switching regulators |
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| Output voltage has it's peak, rms or average value. No matter how it is measured the result depends on it's waveform or shape over time. If the voltage is pure DC it's peak, rms or average values are equal. Voltage with added ripple has different values for peak, rms and average measurement depending on it's shape. So conclusion is simple.
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Davood Amerion
Joined: 01 Mar 2005
Posts: 589
Helped: 90
Location: Persia
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15 May 2006 21:38 conclusion for ripple |
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Absolute ripple voltage depend on output capacitor, converter frequency and output current.
and it is negligible depend on duty cycle.
if current held constant and you vary output voltage, ripple voltage remain nearly constant.
i mean if you decrease output voltage, duty cycle decreased too, and ripple slightly increased.
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