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ESR is important... the ripple current thru the cap ESR is heat. The lower the ESR the lower the temp rise of the cap.
To address your original question about the ripple current equations... the Maxim part is not a fixed frequency device. The frequency moves around depending on the load and duty cycle.
ESR is important... the ripple current thru the cap ESR is heat. The lower the ESR the lower the temp rise of the cap.
To address your original question about the ripple current equations... the Maxim part is not a fixed frequency device. The frequency moves around depending on the load and duty cycle.
Start-up time of what? The soft start time of the buck section or the time it take to charge up the bulk filter caps of the DC supply in front of the buck converter?
I used a .33 uF cap for my soft start, there is a massive formula on page 11 of the app notes so I estimated .33 uF was good enough for me. I have not had a problem so far, also I might have a pcb pattern in .pdf somewhere if you want.
Start-up time of what? The soft start time of the buck section or the time it take to charge up the bulk filter caps of the DC supply in front of the buck converter?
Start up time of the IC itself. I really cant guess at a good time for start up, I figure start the IC up when the voltage of the filter caps is at my lowest input voltage, 11.46v. But since my Filter caps have no R and thus have no Tau, How long do they take to charge?
Your source of power has the R. It's roughly the sum of the resistance of the diodes and the resistance of the transformer secondary. You can also add the reflected impedance of the primary and the resistance of your mains, but they aren't usually a major factor.
(If your transformer is 10:1 and your primary is 100 ohms DC resistance, you can add approximately 10 ohms to your source R.)
Total for this project: $15.53 (excluding the fact I have the transformer and the Filter Caps Already). This is what I call a cheap and effective (and efficient) PSU! Im expecting an efficiency of at least 80% to 90%
Hi Everybody,
I want to designe a 100w varriable smps. I out<3A, 2 v<Vout<33 V, I had tried VIPER100 which was not suitable for a varriable SMPS, Do you know a siutable Half-bridge IC for this application?
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