Ask Mel Berman, from TDK-Lambda a question about AC-DC power supply and DC-DC converter applications

Thanks for the info, I will contact Texas. Do you know if there's a website that lists which ICs are suitable for all the different topologies i.e. buck boost push pull etc.?

Ashley

Hi,

I'm searching a charger component for a battery  pack of 2 cell LiFePO4 (7,2V or 7,4V) from USB supply.

Havee you  got reference of a charger component who integer step up regulator, or a  step up regulator who can start in short circuit?

Thanks

I'm sure that TI, Linear, National & Analog Devices have something like that.  The Analog ADP1111 has adjustable current limit, but might not have the desired output voltage.

Hello S.T.

Our company provides assistance in the "Applications" of AC-DC power supplies and DC-DC converters.  We do not provide designs for these units.

However, I found a web site that may apply to your needs as follows: http://www.eleccircuit.com/dc-power-supply-300v-from-battery-12v/

A word of caution: This involves very high voltages that are dangerous and can be fatal.  We cannot assume responsibility for these designs nor their safety. It would be best for you to purchase a ready made commercial unit.  Many of these can be found on the internet.

Best regards,

Mel

Hi Mel,

Have a power supply question here.

A few years back there was a AC/DC 12 volt power supply listed on this site.  It was one that I used, made a board for for and has worked very well. I found a site that has a full description of the schematic.

http://www.circuit-projects.com/battery/car-charger-for-12v-batteries.html

I recently had a charger/voltage regulator go out on a lawn tractor (dealer say's he'll be happy to replace for $80).  The tractor has a alternator output of 28V, 10A I am trying to make this circuit work for the tractor, however the input voltage to the bridge rectifier is so variable (based on engine RPM's).  I understand this circuit.  I would like to utilize the 10A if headlights, clutches, etc. are engaged, I may need the output.  Modifications that were made to my original design was to put a 2N6397TG 2N6397TG in the place of the Q1.   I realize it is a comparator circuit of sorts, but I am unsure as to regulating the voltage in front of the Q1 without the use of a 7812 (too low of a rating), if I could find a 13.5V 10A voltage reg, I had might as well go buy the part from the dealer (cost factor).  Any suggestions?

Ps. I would like to keep the LED functionalty

Dave