stange core size

FLH · 18th December 2011, 09:07 PM

I pulled apart a projection TV and got 2 ferrite with 1/16 ' gaps and cant find data sheet with same dimensions

49mm wide, 54mm high, window 37 x 10 mm, centre leg 17.16 x 18.5 high , outter legs 6mm x 27mm high.

I thought if I could find data sheet Id have core material etc . theres no continuity . It had litz wire so its for HF .

johansen · 19th December 2011, 01:28 AM

You can get nearly any core material in that format, and it is a common size.

If you can measure the saturation curve accurately that will narrow the material selection.

eem2am · 19th December 2011, 08:41 AM

you won't find datasheet if its form Far East.....it is very difficult to find datasheet for Far Eastern ferrite...i try many times.

Sch3mat1c · 21st December 2011, 12:56 AM

Close enough. http://www.ferroxcube.com/prod/assets/etd54.pdf I'd guess 3C90ish material. A 1/16" gap (surely you measured that in mm as well??) will give you about A_L = 0.21 uH/t^2 and NI_max = 250At or so. Good for maybe a few hundred watts flyback, or a high-ripple forward converter choke, or maybe a resonant type where low magnetizing inductance is required.

Measuring the saturation curve of the material alone will be difficult with the airgap. Few ferrites saturate or overheat at 0.3T or less, so you'd have a hard time screwing it up with conservative estimates regardless of the material.

Tim

LeoLiang · 21st December 2011, 01:22 AM

you can find form www.bobbin.com.tw

thanks.

Leo

21st December 2011, 12:56 AM	#4
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Close enough. http://www.ferroxcube.com/prod/assets/etd54.pdf I'd guess 3C90ish material. A 1/16" gap (surely you measured that in mm as well??) will give you about A_L = 0.21 uH/t^2 and NI_max = 250At or so. Good for maybe a few hundred watts flyback, or a high-ripple forward converter choke, or maybe a resonant type where low magnetizing inductance is required. Measuring the saturation curve of the material alone will be difficult with the airgap. Few ferrites saturate or overheat at 0.3T or less, so you'd have a hard time screwing it up with conservative estimates regardless of the material. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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19th December 2011, 01:28 AM	#2
johansen diyAudio Member Join Date: Apr 2010 Location: seattle, wa	You can get nearly any core material in that format, and it is a common size. If you can measure the saturation curve accurately that will narrow the material selection.

19th December 2011, 08:41 AM	#3
eem2am diyAudio Member Join Date: Jun 2011	you won't find datasheet if its form Far East.....it is very difficult to find datasheet for Far Eastern ferrite...i try many times.

21st December 2011, 01:22 AM	#5
LeoLiang diyAudio Member Join Date: Dec 2011	you can find form www.bobbin.com.tw thanks. Leo

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