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