---- June 25th 2022 ----

CAGE Code: 5DME2
ITAR Registration Code: M28889
Call: 1 (800) 377-3244
Monday to Friday 8 A.M. - 5 P.M. (Pacific Time)
E-mail questions and requirements to: sales@coilws.com

Pricing is subject to change depending on product availability and backorders.
*Please Note: Items without price are listed for CWS' capability purposes.

Power Loss Calculations

Power Loss calculator

Based on the core details the calculator can provide Core Loss for DC and AC.

The calculator link is Power Loss Calculator.

Here is the guide for Calculator


Input details

Part # - this carryover from the website

                METHOD 1                                                          METHOD 2





1.       RMS CURRENT ( Irms ) A

2.       Iripple

3.       Freq

4.       Required Inductance




1.       RMS CURRENT ( Irms ) A

2.       Freq (kHz)

3.       Voltage input (Vin),

4.       Voltage output (Vo),

5.       Ripple voltage (Vripple) ,

6.       Voltage drop at switch (Vsw) (default 1.5V)

7.       Voltage drop Diode (forward voltage drop) Vd (default 0.5V)


·         Approximate Calculation for Buck converter.

·         For the loop stability reason – output capacitor should have resistance of > 100 mOhms.

·         No LC post filter

·         Ripple current is assumed as I peak = Irms + (Ripple A)/2 Amps


Table has the details – core part #, cc, Le, cross section.

Output Results

Winding Loss (W) =

Core loss Dc (W)=

Core Loss AC(W) =

Required Inductance (uH) =

I peak current (A) =



Core loss calculation referred from core manufacturer catalog.

Waveform calculation is based on the Texas Instrument Inductor design guide.



- Power Loss Simulation is an effective tool for evaluating product performance by simulation; however, it does not simulate product performance in all test environments and is not intended to be a replacement for testing of the actual device by means of a test board or otherwise.

- Simulation results are for reference purposes only; CUSTOMER shall perform thorough testing using the actual device.

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Disclaimer: Coil Winding Specialist, Inc., its affiliates, agents, and employees acting on behalf of Coil Winding Specialist, Inc. (collectively, CWS) disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. CWS reserves the right at any time and from time to time to make changes to design, technical specification, or construction of any product listed on this website without notice. CWS also reserves the right to discontinue or limit sale of any product or service available throughout this website on temporary or permanently basis without notice. CWS highly recommends customers not to use its products offered on this website for inappropriate use and applications. Products should be tested for its suitability by prospective customers in all possible applications and conditions. Customers using or selling CWS products for use in other than recommended applications do so entirely at their own risk and agree to fully indemnify CWS from any damages arising or resulting from such use or sale.

WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go towww.P65Warnings.ca.gov.

Any Comments, Suggestions or Questions? Contact us!
Email: sales@coilws.com
CWS 353 West Grove Ave. Orange, California 92865
Call us Toll Free: 1-800-679-3184 or 1 (800) 377-3244

Tel: (714) 279-9010, Fax: (714) 279-9482

Copyright 2008, Coil Winding Specialist, Inc
Updated July, 2013

CAGE Code: 5DME2(Registered with www.ccr.gov)