Mini current sense transformers sense up to 20A

January 14, 2016 // By Graham Prophet
Coilcraft’s CST7030 Series of surface mount current sense transformers measure 5.2 x 7.0 mm (with a max height of 3.0 mm) and sense up to 20A at frequencies between 10 kHz and 1 MHz. Typical applications include load current measurement and control in switching power supplies and overload/short-circuit protection.

The devices are also qualified to AEC-Q200 Grade 1 (-40°C to +125°C) standards, suiting them for conventional vehicle and xEV (EV, HEV, FCEV) applications such as current measurement in traction motors and battery management systems. They are also suited for use in 48V vehicle systems.

The CST7030 Series is available with five turns ratios (primary-to-secondary) ranging from 1:20 to 1:150. It offers very low primary DC resistance (0.0015 Ohms) and 500 Vrms, one minute isolation (hipot) between windings. Coilcraft also offers a high-isolation (1,500 Vdc) version with its CU8965-AL Series.