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Hey PWM, The book "The Art of Electronics" covers operational amplifiers in GREAT detail WITHOUT going into absurdly complex math to do so. It expects you to be thoroughly familiar with their operation BEFORE you go on to PWM's. Anyway, now that I think about it, I want to ask you...

Dear PWM, One of the things I have found out (the hard way) throughout my 30+ year career is that no matter what happens, no matter what the design or its complexity, the overriding principle that you should always keep foremost in your mind is the K.I.S.S. principle. I think you are making...

As mentioned by RickF, your questions are pretty general. Instead of making the operation of switchmode power supplies more complex than it has to be, try this book by John D. Lenk, "Simplified Design of Switching Power Supplies". It is an EDN publication, Butterworth-Heinemann...

Hi mjbw, It looks like you have a nice, stiff source of current. I would consider the National Semi LM2676S-3.3 for a direct conversion. This gives you 3 amperes capability. Go to the National Semiconductor website and then into Webench, power. Input your input voltage minimum and maximum...

From elektron, Sorry, I did not notice the negative voltage requirement at first. You are correct in the buck/boost. The National site is a little strange at times, but once you get used to it, it seems to work fairly well. The other site mentioned in Germany looks quite good. Try it, too.

Hi Walker1 First, why are you restricted to the 35 KHz switching frequency? The higher the frequency, the lower the cost and the smaller the inductor. Also, it does not sound like you need a boost/buck converter. Boost is used when your input voltage is lower than you output voltage, a buck...

Greetings lukeyd, If you are trying to develop a circuit that does this there are any number of approaches, all varying in complexity. One of the simplest and most elegant ways to do this is to take your garden variety op amp and stick a Digital to Analog converter in the feedback loop. The...

In addition to what was mentioned by the other folks, here is a different purpose for them. Zero ohm jumpers are just that, jumpers. For example, when you have a layout for a PC board that is single-sided (cheaper than double-sided) and the circuit requires two or more traces to cross but it...