Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Boost converting is not easy. Hope you need a converter from 12 volts to 20 volts 3.5amps for charging/operatiing a laptop. I do have a circuit but may take 2-3 days to find in my collection. But i''ll post it here. May be you'll get better posts from other friends within that time.
Sorry...sorry..Actually i forgot about this post. Here are two simple DC to DC booster circuit based on SG3525. More details of the project and the transformers can be seen at "http://sound.westhost.com/project89.htm". Only thing you have to do is custom design a transformer with the required voltage you need.
Good luck
i am experimenting with almost exactly the same circuit,
the SG3525 is directly driving the MOSFET via gate resistors.
The main difference in the above circuit is the driving of the MOSFETs
can anyone shed any experience as to whether the first one with additional
components to drive the MOSFETs be any superior in practise?
According to specs the SG3525 is well capable of driving the capacitve load of
the MOSFET gates, and my experiments seem to confirm that.
But i'm unsure of any downsides, maybe reliability ??
Another question I have is about configuring dead-time with the SG3525,
i'm not sure......its different to a TL494....
any advice please?
Re: easy-to-build 12V car battery in/20V 3.5A 3524-based La
not enough amps for clean gate drive. would work for one low Qg fet per .. but rise/fall would be very slow.. hence power dissipation much higher.
i like the LT1243 8-DIP for these circuits, 1.5A output pwm controller.. very nice to not need a driver even for high freq. /high power switching..saves alot of boardspace.
plus.. a diode and a resistor on COMP and the Current sense threshold can be lowered to around 20mV reliably.. no more huge/dissipating/high resistance current sense resistors.. or seperate Cs amps. NICE
thanks guys for the links, i was looking for a 12VCD to 20VDC for quite some time, i'll study and make some tests with the ones u guys posted, then i'll post the results.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
