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Title: Power Supply Post by: krasrab on August 31, 2007, 01:53:03 01:53 How power supply from ~48V to 12V without transform?
Title: Re: Power Supply Post by: jamen on August 31, 2007, 02:29:35 02:29 1.maybe use back circuit, but need a inductance.
2.use PI IC LNK304 Title: Re: Power Supply Post by: spider on August 31, 2007, 04:10:15 04:10 How power supply from ~48V to 12V without transform? P = ?(W) n = ?(%) Title: Re: Power Supply Post by: crowinu on August 31, 2007, 09:40:11 09:40 1.maybe use back circuit, but need a inductance. 2.use PI IC LNK304 did u mean buck converter?? Title: Re: Power Supply Post by: Taner on August 31, 2007, 10:28:47 22:28 you can use LM2575HVT-12 (1A) or LM2576HVT-12 (3A)
:) Title: Re: Power Supply Post by: krasrab on September 02, 2007, 01:17:41 13:17 P=1W, Price must bee very small.
Title: Re: Power Supply Post by: user112 on September 02, 2007, 04:08:17 16:08 to transform from 48V AC to 12V AC 1W (if I understand good) if your load is resistive and you know it's value you can use a resistor
R=U/I U=48-12=36V I for 1W 12V it is aprox. 0.1A in DC R=360 ohms; power for R is minimum 7W if the load is not resistive you must use AC-DC-AC converter but for this power I think it is more expensive that an transformer. give more detail in the future Title: Re: Power Supply Post by: krasrab on September 03, 2007, 10:13:26 10:13 7W is many power. I want use lm5009. May be already used this part?
Sorry for my english/ Title: Re: Power Supply Post by: wichayen on March 31, 2008, 03:41:57 03:41 Use DC-DC converter with using Inductor. such as MC34063.
Title: Re: Power Supply Post by: Tricky Nekro on April 01, 2008, 05:55:29 17:55 Really depends on what you are doing...
A regulator @12V can handle it but don't expect many Ambers continuously, just 1A peak foe most regulators ( there are exceptions ) What are you building anyway, can't help you without knowing that... You may want to power bulbs, you may want to power amplifiers, you may..... Cheers, Lefteris Title: Re: Power Supply Post by: carlao on April 07, 2008, 03:56:27 03:56 For 1W?
Well, can you try a divisor through resistors? Title: Re: Power Supply Post by: asahin11 on April 08, 2008, 08:48:55 08:48 You can use a regulator such as LM317.
Title: Re: Power Supply Post by: alex@home on April 08, 2008, 11:36:41 11:36 can i use that to supply from ~230V to 5V to?
thx Title: Re: Power Supply Post by: pickit2 on April 08, 2008, 11:59:33 11:59 can i use that to supply from ~230V to 5V to? use a wall wart [unless you have a death wish]thx you must have a power supply that you can convert. ie: power for cd player thats no longer working, charger for cell phone. the list is endless. Title: Re: Power Supply Post by: alex@home on April 09, 2008, 08:18:23 08:18 use a wall wart [unless you have a death wish] you must have a power supply that you can convert. ie: power for cd player thats no longer working, charger for cell phone. the list is endless. sorry for my bad english. that was i mean i saw sometimes in small circuits, but i dont understand it. i need a small current. ca. 20mA to max. 50mA. that what i saw was made only by a resistor and a capatriator. do you know what i mean and how i can calculate it and whats the max. current that i can use with this variant? nice regards |