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Old 15th September 2013, 09:35 AM   #1
dazzz is offline dazzz  Israel
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Default Coil replacement TO COIL 330UH IN THE pathway regulator 7809 ?

I need help on the part chosen for the SMPS mode of Danon 2900
One of the components I replaced this coil L909
Its value 4.7UH
His model is LHL08TB4R7M

Inductance- 4.7UH

Current Rating-
3A

DC Resistance- 0.025

Frequency - Self Resonan- 30MHZ

Q @ Freq - 40 @ 7.96MHz


I bought this coil PANASONIC - ELC-10D Series 330UH


nductance-330UH

DC Resistance Max-0.32ohm

RMS Current (Irms) - 900mA

DC CURRENT RATING-0.9A

Test Frequency
-10KHZ


Can I use a coil that I bought
I worry only because the current value ?
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File Type: jpg l909.jpg (87.8 KB, 37 views)
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Old 15th September 2013, 10:17 AM   #2
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From the small bit of the circuit that you have shown, it appears to be too low a current. The voltage there is DC so the coil is only there to reduce HF noise. Be careful of its DC resistance though as there could be up to 3A flowing, 1A each through the 3 x regulators that can be seen.

Personally I would get a coil that can handle at least 3A, not 0.9A, as the regulators have heatsinks they might be passing more than 0.9A in total.

Last edited by KatieandDad; 15th September 2013 at 10:21 AM.
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Old 15th September 2013, 10:26 AM   #3
dazzz is offline dazzz  Israel
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Quote:
Originally Posted by KatieandDad View Post
From the small bit of the circuit that you have shown, it appears to be too low a current. The voltage there is DC so the coil is only there to reduce HF noise. Be careful of its DC resistance though as there could be up to 3A flowing, 1A each through the 3 x regulators that can be seen.

Personally I would get a coil that can handle at least 3A, not 0.9A, as the regulators have heatsinks they might be passing more than 0.9A in total.
Thanks
This is what I thought to
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Old 15th September 2013, 10:49 AM   #4
FoMoCo is offline FoMoCo  United States
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There could be up to 3A flowing, but most likely not. You can always measure the current flowing. If it's under, say, 500mA, go for it. Or you can play it safe and get an inductor with a higher current rating. (My personal choice.) The inductance value would not be critical.
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Old 15th September 2013, 11:17 AM   #5
dazzz is offline dazzz  Israel
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Quote:
Originally Posted by FoMoCo View Post
There could be up to 3A flowing, but most likely not. You can always measure the current flowing. If it's under, say, 500mA, go for it. Or you can play it safe and get an inductor with a higher current rating. (My personal choice.) The inductance value would not be critical.

My problem is to find coil 330UH
That the diameter is not too large
( In the Area I replaced the coil dnot have much room )
3 amps I've seen in FARRNEL
Starting diameter 25 mm
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File Type: jpg IMG_0022 1.jpg (804.8 KB, 30 views)

Last edited by dazzz; 15th September 2013 at 11:33 AM.
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Old 15th September 2013, 11:35 AM   #6
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It's probably not doing much anyway, try a shorting link in place of the inductor.
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Old 15th September 2013, 12:08 PM   #7
dazzz is offline dazzz  Israel
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Quote:
Originally Posted by KatieandDad View Post
It's probably not doing much anyway, try a shorting link in place of the inductor.
I have a reason I replaced the coil
I do a comprehensive project on power supply
The DENON DVD 2900
And increasing the value of this coil give me better nois filtering to reg 7809
7909
9 volt
If I replace the coil in this with shorting link I did not do anything

Last edited by dazzz; 15th September 2013 at 12:15 PM.
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Old 15th September 2013, 12:14 PM   #8
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True, but you can't find a coil to fit.

You could try an axial coil and mount it vertically.
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Old 15th September 2013, 12:20 PM   #9
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This one might fit.

Buy Leaded Inductors Inductor radial ELC09D 4.7uH Panasonic ELC09D4R7F online from RS for next day delivery.
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Old 15th September 2013, 12:24 PM   #10
dazzz is offline dazzz  Israel
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Quote:
Originally Posted by KatieandDad View Post
True, but you can't find a coil to fit.

You could try an axial coil and mount it vertically.

I might have a solution
Buy Coil 330UH 4.5A
FROM FARNELL

MURATA POWER SOLUTIONS
INDUCTOR, 330UH, 4.5A




And mount it in the bottom of the SMPS
What do you think ?
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