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krasrab
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 « on: August 30, 2007, 07:53:03 19:53 »

How power supply from ~48V to 12V without transform?
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jamen
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 « Reply #1 on: August 30, 2007, 08:29:35 20:29 »

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 30, 2007, 10:10:15 22:10 »

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, 03:40:11 03:40 »

1.maybe use back  circuit, but need a inductance.
2.use PI IC LNK304

did u mean buck converter??
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Taner
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 « Reply #4 on: August 31, 2007, 04:28:47 16:28 »

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, 07:17:41 07:17 »

P=1W, Price must bee very small.
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user112
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Salut tuturor(hallo to all)

 « Reply #6 on: September 02, 2007, 10:08:17 10:08 »

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
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krasrab
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 « Reply #7 on: September 03, 2007, 04:13:26 04:13 »

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 30, 2008, 09:41:57 21:41 »

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, 11:55:29 11:55 »

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 )

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 06, 2008, 09:56:27 21:56 »

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, 02:48:55 02:48 »

You can use a regulator such as LM317.
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alex@home
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 « Reply #12 on: April 08, 2008, 05:36:41 05:36 »

can i use that to supply from ~230V to 5V to?

thx
 « Last Edit: April 08, 2008, 05:42:43 05:42 by alex@home » Logged
pickit2
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 « Reply #13 on: April 08, 2008, 05:59:33 05:59 »

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, 02:18:23 02:18 »

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
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