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krasrab
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« on: August 31, 2007, 01:53:03 01:53 » |
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How power supply from ~48V to 12V without transform?
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jamen
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« Reply #1 on: August 31, 2007, 02:29:35 02:29 » |
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1.maybe use back circuit, but need a inductance.
2.use PI IC LNK304
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spider
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« Reply #2 on: August 31, 2007, 04:10:15 04:10 » |
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How power supply from ~48V to 12V without transform?
P = ?(W) n = ?(%) |
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crowinu
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« Reply #3 on: August 31, 2007, 09:40:11 09:40 » |
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1.maybe use back circuit, but need a inductance.
2.use PI IC LNK304
did u mean buck converter?? |
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It Can't Rain All The Time
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Taner
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« Reply #4 on: August 31, 2007, 10:28:47 22:28 » |
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you can use LM2575HVT-12 (1A) or LM2576HVT-12 (3A)  |
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krasrab
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« Reply #5 on: September 02, 2007, 01:17:41 13:17 » |
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P=1W, Price must bee very small.
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user112
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Salut tuturor(hello to all)
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« Reply #6 on: September 02, 2007, 04:08:17 16:08 » |
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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
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krasrab
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« Reply #7 on: September 03, 2007, 10:13:26 10:13 » |
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7W is many power. I want use lm5009. May be already used this part?
Sorry for my english/
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wichayen
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« Reply #8 on: March 31, 2008, 03:41:57 03:41 » |
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Use DC-DC converter with using Inductor. such as MC34063.
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Tricky Nekro
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« Reply #9 on: April 01, 2008, 05:55:29 17:55 » |
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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
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carlao
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« Reply #10 on: April 07, 2008, 03:56:27 03:56 » |
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For 1W?
Well, can you try a divisor through resistors?
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asahin11
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« Reply #11 on: April 08, 2008, 08:48:55 08:48 » |
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You can use a regulator such as LM317.
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alex@home
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« Reply #12 on: April 08, 2008, 11:36:41 11:36 » |
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can i use that to supply from ~230V to 5V to?
thx
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« Last Edit: April 08, 2008, 11:42:43 11:42 by alex@home »
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pickit2
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« Reply #13 on: April 08, 2008, 11:59:33 11:59 » |
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can i use that to supply from ~230V to 5V to?
thx
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. |
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alex@home
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« Reply #14 on: April 09, 2008, 08:18:23 08:18 » |
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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 |
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