Picking an inductor

[George Herold]

Hi all, silly question. (And I'll most likely just pick something before
I get an answer.)

So just a simple LP filter for a power supply rail. (SMPS, at ~100-200 kHz.)
manufacturer recommends ~10-47 uH (I picked 22 uH) and 22 uF.)
max current is 500 mA.. typical current is ~100 mA.
On to digikey. After putting in the inductance,
current ratings (saturation) for 500mA to 2 A, and shielded, I'm left with
173 options.

My usual approach then is to sort them by amount of stock, and pick something
in the top ten.

Which got me to this puppy,
http://www.digikey.com/product-detail/en/taiyo-yuden/NR6028T220M/587-2103-1-ND/1866243

Does that seem reasonable?

 

[George Herold]

On Thursday, May 26, 2016 at 11:58:12 AM UTC-4, Phil Hobbs wrote:

On 05/26/2016 11:21 AM, George Herold wrote:
Hi all, silly question. (And I'll most likely just pick something before
I get an answer.)

So just a simple LP filter for a power supply rail. (SMPS, at ~100-200 kHz.)
manufacturer recommends ~10-47 uH (I picked 22 uH) and 22 uF.)
max current is 500 mA.. typical current is ~100 mA.
On to digikey. After putting in the inductance,
current ratings (saturation) for 500mA to 2 A, and shielded, I'm left with
173 options.

My usual approach then is to sort them by amount of stock, and pick something
in the top ten.

Which got me to this puppy,
http://www.digikey.com/product-detail/en/taiyo-yuden/NR6028T220M/587-2103-1-ND/1866243

Does that seem reasonable?





Depends on what B fields are flying around--it's unshielded, and so can
transmit and receive.

It's listed as "shielded". Which I guess means it's not as bad as
an open ended coil. There is ~50-100 mV of ripple, so a little
local pickup should be fine.

George H.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net

 

[Phil Hobbs]

On 05/26/2016 11:21 AM, George Herold wrote:

Hi all, silly question. (And I'll most likely just pick something before
I get an answer.)

So just a simple LP filter for a power supply rail. (SMPS, at ~100-200 kHz.)
manufacturer recommends ~10-47 uH (I picked 22 uH) and 22 uF.)
max current is 500 mA.. typical current is ~100 mA.
On to digikey. After putting in the inductance,
current ratings (saturation) for 500mA to 2 A, and shielded, I'm left with
173 options.

My usual approach then is to sort them by amount of stock, and pick something
in the top ten.

Which got me to this puppy,
http://www.digikey.com/product-detail/en/taiyo-yuden/NR6028T220M/587-2103-1-ND/1866243

Does that seem reasonable?

Depends on what B fields are flying around--it's unshielded, and so can
transmit and receive.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510

hobbs at electrooptical dot net
http://electrooptical.net