Document 132 Current Sensing Transformers These low cost Coilcraft current sensing transformers are designed for use up to 100 kHz. They incorporate the current and sense windings in one small, encapsulated package requiring minimum board space. Varying the terminating resistance allows sensitivities of 1 to 100 Volts output per Ampere input. Coilcraft current sensing transformers are designed to provide 6 mm creepage/clearance between primary and secondary windings Applications include feedback control, overload sensing, detecting load drop or shutdown, and proportional output. Coilcraft Designer’s Kit P403 contains the three standard current sensing transformers, sensor-only versions of each, plus two 50/60Hz current sensors. To order, contact Coilcraft or visit http://order.coilcraft.com. Part number Turns (N) pri : sec Inductance1 min (mH) Frequency range2 (kHz) Sensed current range Iin Terminating resistance RT3 range (Ohms) RT for 1 Vout from 1 A Iin CS4050V-01L CS4100V-01L CS4200V-01L 1 : 50 1 : 100 1 : 200 5 20 80 5 – 25 5 – 50 1 – 100 2 mA – 10 A 5 mA – 24 A 5 mA – 35 A 50 – 5000 100 – 10,000 200 – 20,000 50 Ohms 100 Ohms 200 Ohms 1. 2. 3. 4. 5. Inductance is for the secondary, measured at 15.75 kHz, 1 Vrms. Square wave response deteriorates above and below this frequency. Varying terminating resistance increases or decreases output Voltage/Ampere according to the following equation: RT = Vout × Nsec / Iin Operating temperature range –40°C to +85°C. Electrical specifications at 25°C. COILCRAFT CS-4xxxV 906 xxx 0.75 Typical Circuit 2 I in Pri 3 19,05 1 0.105/0.150 2,67/3,81 RT Sec Vout CURRENT 4 2 1 0.069 1,76 0.20 ±0.005 5,08 ±0,125 CL 0.088 2,23 3 CL SENSE 0.03 0,76 0.77 max 19,56 0.30 ±0.005 7,62 ±0,125 4 Recommended PC Board Layout 3 0.40 ±0.01 10,16 ±0,25 0.57 max 14,48 4 0.041 1,041 0.052 1,321 1 2 0.060 × 0.460 1,52 × 11,68 Specifications subject to change without notice. Please check our website for latest information. © Coilcraft, Inc. 2008 max Weight: 8.8 – 9.3 g Terminations: Tin-silver over copper Packaging: 28 per tube Document 132 Revised 03/20/07