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, 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.
Part
number
CS4050V-01L
CS4100V-01L
CS4200V-01L
1.
2.
3.
4.
5.
Turns (N)
pri : sec
1 : 50
1 : 100
1 : 200
Inductance
1
min (mH)
5
20
80
Frequency
range
2
(kHz)
5 – 25
5 – 50
1 – 100
Sensed
current
range
I
in
2 mA – 10 A
5 mA – 24 A
5 mA – 35 A
Terminating
resistance R
T
3
range (Ohms)
50 – 5000
100 – 10,000
200 – 20,000
R
T
for
1 V
out
from 1 A
I
in
50 Ohms
100 Ohms
200 Ohms
Typical Circuit
2
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: R
T
= V
out
× N
sec
/
I
in
Operating temperature range –40°C to +85°C.
Electrical specifications at 25°C.
COILCRAFT
CS-4xxxV
906 xxx
0.75
1
19,05
max
I
in
0.105/0.150
2,67/3,81
Pri
3
Sec
4
R
T
V
out
CURRENT
SENSE
0.30 ±0.005
7,62 ±0,125
2
1
0.77
max
19,56
0.40 ±0.01
10,16 ±0,25
0.03
0,76
0.57
max
14,48
0.069
1,76
0.20 ±0.005
5,08 ±0,125
0.052
1,321
3
4
C
L
0.041
1,041
0.088
2,23
3
C
L
4
2
1
Recommended
PC Board Layout
0.060 × 0.460
1,52 × 11,68
Weight:
8.8 – 9.3 g
Terminations:
Tin-silver over copper
Packaging:
28 per tube
Specifications subject to change without notice.
Please check our website for latest information.
Document 132
Revised 03/20/07
© Coilcraft, Inc. 2008
COILCRAFT [ Coilcraft lnc. ]
