Compact SMT 30 A Current Sense Transformers – PH9494 Series

Pulse Electronics, a YAGEO Company has expanded its range of surface mount current sense transformers (CST). This 13 mm x 10 mm x 7.2 mm EE8 platform extends the current carrying capability of miniature CST product up to 30 A, implementing a very low DCR (0.35 mOhm max) single turn primary winding. The series includes multiple secondary winding configurations enabling primary to secondary turns ratios from 1:50 to 1:200.

Current sense transformers provide isolation between sensitive control circuits and the higher power rails being measured. They are a cost-effective and low-loss approach for measuring currents in high-frequency voltage regulators and switch mode power supplies. The current to be sensed is routed through the single turn low resistance primary winding, which creates a magnetic field within the component core. This magnetic field is then coupled to high turn count secondary, creating a lower current proportional to the turns ratio. As there is no electrical connection between primary and secondary safe isolation is achieved.