A problem encountered with medium-to-fast current-mode flyback switchers, when combining high-ratio multi-winding flyback inductors with...

A problem encountered with medium-to-fast current-mode flyback switchers, when combining high-ratio multi-winding flyback inductors with multipliers: When Q1 switches on, a large current surge flows as Cpump charges from Cmult1 via D2. At Q1, the surge magnitude is multiplied by the transformer ratio. On simulation, U1 senses this via Rs and cuts Q1 off instantly, crippling the switcher -- ...

I need to throw together a ~150 volt supply at a few 10s of mA to test a circuit idea, but I don't have much in the way of MOSFETs in my junk...

I need to throw together a ~150 volt supply at a few 10s of mA to test a circuit idea, but I don't have much in the way of MOSFETs in my junk box to build a switcher from. The only high-voltage device I have in stock is a couple Fairchild FQP2N60Cs, rated for 600V and 2 amps. That might be a possibility. I also have some lower voltage power devices, and I'm wondering if there would b...

Hi all, Well I get to do a SMPS. There are boat loads of IC's out there and I'm looking for recommendations. (I better go re read AoE3) I...

Hi all, Well I get to do a SMPS. There are boat loads of IC's out there and I'm looking for recommendations. (I better go re read AoE3) I need a number of output voltages. +15V, +5V, -5V, -15V. and +24V. maximum current of 0.5A on any one. My current plan is to run the whole thing from a 24V wall wart or brick. Price and size is not too much of an issue, I guess fewer external pa...

For a hobby project, I'd like to be able to generate +48 volts or so from +5 volt USB. Current requirements are small, maybe 15 mA or so?...

For a hobby project, I'd like to be able to generate +48 volts or so from +5 volt USB. Current requirements are small, maybe 15 mA or so? I'd like uh, low noise (I don't have an exact spec so this is just kind of existential at this point), so maybe a charge pump would be in order rather than a boost switcher? Does anyone make a charge pump IC that I could feed an external clock to...

I need a mosfet gate driver, to drive two n-fets in a half-bridge (totem pole) config, 5 volts nom in, with some sort of bootstrap for the...

I need a mosfet gate driver, to drive two n-fets in a half-bridge (totem pole) config, 5 volts nom in, with some sort of bootstrap for the upper fet gate. Switcher output will be around 2.5 volts at 5 amps, so the gate drives don't have to be monstrous. I've been working with LTC4442 on a breadboard, but it's really erratic. Sometimes it's beautiful, and sometimes the gate drive breaks ...

Hi, Here's a new SMPS switcher apparently coming out next year for...

Hi, Here's a new SMPS switcher apparently coming out next year for laptops: http://phys.org/news/2013-12-circuit-laptop-charger-brick.html It apparently has a "power reclaiming scheme" for higher efficiency, would this be conventional sync rectification or some other thing? It looks like power electronics is in for a big (r)evolution once the 300MHz+ designs start to spread! cheer...

Has anyone run bldc fans in series? I want to run three 12v fans from a 48v supply, with a resistor or something in series I guess I could be...

Has anyone run bldc fans in series? I want to run three 12v fans from a 48v supply, with a resistor or something in series I guess I could be cautious and put a cap and a 12v TVS across each fan. Hmmm, 3 fans and 4 TVSs might work. Worst case, I can make a 48 to 12 switcher. Here's the idea: https://www.dropbox.com/s/5hx2hzrq4edd3ye/P944_Load_Module_1.jpg?raw=1 -- I yam ...

I'm wanting to use a microcontroller to control the output of a switching regulator, maybe something like a LM2576 simple switcher. I see the...

I'm wanting to use a microcontroller to control the output of a switching regulator, maybe something like a LM2576 simple switcher. I see the adjustability is on the feedback lead but what's the best way make it adjustable from a microcontroller. I'm guessing the feedback may be used in switching timing, ie, I guess I can't just use a DAC and get an output of 1.23V more than the DAC ...

Folks, Looked at Digikey and some others. Where are those huge capacitance varicaps? The ones with several hundred pF of range for AM radios....

Folks, Looked at Digikey and some others. Where are those huge capacitance varicaps? The ones with several hundred pF of range for AM radios. All gone lalaland by now? Even the ones I found in the 100pF range are either obsolete or not recommended for new designs. What I am trying to do: I need to control a switcher chip in frequency because I've got a very resonant load to deal with....

*NOT* version four, but version THREE? The baby bird GooGull gives "references" like Yahoo which does not have what was advertised, a PDF...

*NOT* version four, but version THREE? The baby bird GooGull gives "references" like Yahoo which does not have what was advertised, a PDF reference, Linear's site which has version four and it is not switcher at all, etc ad nauseum bs. I had it but the HD went a bit bad and now it is non-functional.

Switcher cad?? NO transformers. NO saturable inductors. NO selection of ferrite core materials. NO selection of ferrite core...

Switcher cad?? NO transformers. NO saturable inductors. NO selection of ferrite core materials. NO selection of ferrite core sizes or shapes. WTF??

can anyone explain how the pre-regulator circuit with a pmos threshold setting the differential voltage across a linear regulator works? the...

can anyone explain how the pre-regulator circuit with a pmos threshold setting the differential voltage across a linear regulator works? the situation is you have a dc/dc switcher going to a linear regulator, and you use a pmos to keep your dropout voltage at a minimum set by the pmos threshold voltage I saw this thing on the eevblog video, link below http://www.eevblog.com/2012/03/20/...