72 Series - Switch Mode Power Supply

The 72-000, 72-100, 72-200, 72-300, 72-400 and 72-500 series current sense transformer are mainly used in 20 Khz - 200 Khz and above range, like in a switch mode power supply. The secondary inductance shown in our specification data is measured at the given voltage level ( the test voltage freq. is set at 15.75 Khz) shown at the right of the inductance value.

The terminating resistor is also called the "burden resistor", and it is the resistor across the secondary terminals. The voltage across the terminating resistor is equal to Terminating Resistor divided by Number of secondary turns. This is the voltage that is being measured by the engineer for current monitoring purposes.

The primary Unipolar rating refers to single ended wave forms ( swing from zero to positive) such as in forward topology, etc. Primary bipolar primary waveform refers to double ended topology ( swing from positive to negative). These ratings are in Amperes-microseconds, and it is the maximum at which the transformer core will not saturate. Amp-microsec is the current flowing through the primary multiply by the ON time. The peak primary current these transformer can handle is up to 35 Amps.

72-00X (Encapsulated)
Customer install Primary, Through Hole, Turn Ratio of 1: 50 to 1: 300


72-10X (Encapsulated)
Built in Single Turn Primary, Through Hole, Turn Ratio of 1: 50 to 1: 300


72-20X (Epoxy Coated)
Customer install Primary, Through Hole, Turn Ratio of 1: 50 to 1: 300


72-30X (6 Amps Surface Mount)
Built in Single Turn Primary, Turn Ratio of 1: 70 to 1: 125


72-40X (35 Amps Surface Mount)
Built in Single Turn Primary, Turn Ratio of 1: 30 to 1: 300


72-50X (Non Encapsulated)
Built in Single Turn Primary, Through Hole, Turn Ratio of 1:1: 50 to 1:1: 300

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 to www.P65Warnings.ca.gov.

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Updated July, 2013
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