The new CST7030 series of surface mount current sense transformers from Coilcraft measure just 5,2 x 7,0 mm (with a maximum height of 3,0 mm) and sense up to 20 A of current 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, making them ideal for conventional vehicle and xEV (EV, HEV, FCEV) applications such as current measurement in traction motors and battery management systems. They are also well suited for use in 48 V 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 ) and 500 Vrms, one minute isolation (hi-pot) between windings. Coilcraft also offers a high-isolation (1500 V d.c.) version in the form of the CU8965-AL series.
These current sense transformers feature RoHS compliant tin-silver, over tin, over nickel, over phosphor bronze terminations, and have a maximum reflow temperature of 260°C.
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