help with transformer secondary - Page 4

Christer · 7th July 2006, 11:23 PM

Perhaps chapter 8 of this document might also be of some use
http://www.onsemi.com/pub/Collateral/HB206-D.PDF

Shredly · 7th July 2006, 11:38 PM

Nice link, Christer. Yes, that will do it too.

poobah · 7th July 2006, 11:59 PM

Yeah... I just looked at the Hammonds... I was surprised to 10 & 11 volts!

Let's see what jarthel can get his hands on...

Looks like it pretty much needs somewhere around 25,000 to 40,000 uF just to meet Ripple current specs (~4 A).

Shredly · 8th July 2006, 12:26 AM

Don't forget that it's iterative- changing the capacitance changes the ripple makes you choose another capacitor, changing the capacitance again which changes the ripple again which makes you...

Gah.

Shredly · 8th July 2006, 01:01 AM

Ha! Got it in one.

Use the 167P10 transformer, and the 103M063A052 cap, Mouser part number 5985-63V10000 on page 540 of the current catalog. You'll need two of them, but the major advantage is they're only $8 a pop, so you get out of it for $16. BTW, the ESR on those is 0.027, so two in parallel is 0.0135Ohm. Current ripple handling is 8.8Arms, and according to the sim, you get only about 6A, so that's fine.

Use GBU402, Mouser p/n 821-GBU402, rectifier- 150A surge, 100PIV, 4A, $0.69 a pop- or get a little more ambitious and spend a whole simolean on theg 200/200/6 one.

Get the transformer from digikey, unless you can get Mouser to let you special order it and they don't charge you more than $25 or so for it.

Let us know if you need help with the decoupling and massaging and bypass caps for the LM1085. The data sheet doesn't tell you everything you need to know, though it comes close. I know a coupla tricks.

ETA: Sorry about that folks, I shoulda mentioned the caps are 10mF 63V.

EATA: ...and it looks like you're gettin out the door for under 50 simoleans... not bad.

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7th July 2006, 11:23 PM	#31
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	Perhaps chapter 8 of this document might also be of some use http://www.onsemi.com/pub/Collateral/HB206-D.PDF

7th July 2006, 11:38 PM	#32
Shredly diyAudio Member Join Date: May 2006	Nice link, Christer. Yes, that will do it too.

7th July 2006, 11:59 PM	#33
poobah diyAudio Member Join Date: Nov 2005	Yeah... I just looked at the Hammonds... I was surprised to 10 & 11 volts! Let's see what jarthel can get his hands on... Looks like it pretty much needs somewhere around 25,000 to 40,000 uF just to meet Ripple current specs (~4 A).

8th July 2006, 12:26 AM	#34
Shredly diyAudio Member Join Date: May 2006	Don't forget that it's iterative- changing the capacitance changes the ripple makes you choose another capacitor, changing the capacitance again which changes the ripple again which makes you... Gah.

8th July 2006, 01:01 AM	#35
Shredly diyAudio Member Join Date: May 2006	Ha! Got it in one. Use the 167P10 transformer, and the 103M063A052 cap, Mouser part number 5985-63V10000 on page 540 of the current catalog. You'll need two of them, but the major advantage is they're only $8 a pop, so you get out of it for $16. BTW, the ESR on those is 0.027, so two in parallel is 0.0135Ohm. Current ripple handling is 8.8Arms, and according to the sim, you get only about 6A, so that's fine. Use GBU402, Mouser p/n 821-GBU402, rectifier- 150A surge, 100PIV, 4A, $0.69 a pop- or get a little more ambitious and spend a whole simolean on theg 200/200/6 one. Get the transformer from digikey, unless you can get Mouser to let you special order it and they don't charge you more than $25 or so for it. Let us know if you need help with the decoupling and massaging and bypass caps for the LM1085. The data sheet doesn't tell you everything you need to know, though it comes close. I know a coupla tricks. ETA: Sorry about that folks, I shoulda mentioned the caps are 10mF 63V. EATA: ...and it looks like you're gettin out the door for under 50 simoleans... not bad.

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