Electronics > Projects, Designs, and Technical Stuff
Suggestion:Which Currentmode PWM controller, Vin 3-6V?
Yansi:
Hello!
I have just sifted through 38 pages on Mouser, trying to find a current-mode pwm controller, capable of running from 3 to 6V, unfortunately unsuccessfully.
What I am aiming for is a battery powered (4xAA alkaline) boost converter, just couple of W, but rather higher voltage, than usually available chips --> hence external mosfet required.
The closest I came around was MCP1632, unfortunately, 6V absolute maximum is I think not safe for use with 4 AA cells. (something like UC3843, however for <4V operational voltage would be sooo nice!). Am I asking for just too much? ???
Thank you for any suggestions! Cheaper the better!
Buriedcode:
What output voltage? If it is only slightly higher than the max output voltage, coupled inductors 1:1 are widely available in a range of inductance and will half the peak switch voltage.
Yansi:
Coupled inductors forbidden. Too pricey & I am too lazy to wind any such. And I am trying to avoid designing this around the old steaming pile 34063...
It is just a one-off project for a friend, output voltage needs to be 80V and reasonably clean (quite sensitive stuff will be supplied with it). Hence why I wanted a PWM controller, not hysteretic controller like 34063, which are little factories for big interference.
mariush:
Maybe check
LT8361 ... barely... 5v or higher preferred.
LT3482 ... up to 90v output voltage, with low input voltage.
Both chips around 3.5$ if you buy 10-25... something like that.
Yansi:
Waaaaaay to pricey for what it is. I can't get those under $10 a pop. I could make a whole bunch of different solutions for that price, including the coupled inductor one.
I have not considered using IC with integrated switch, due to exactly this pricing. :-/ So just looking for a controller IC, or one that an external mosfet may be connected to.
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