*
*
Frequency Range from 10KHz to 200KHz
*
Fully Encapsulated Construction
PM-CSXX
RoHS
CURRENT SENSE
TRANSFORMERS
Designed for Switch Mode Power Supply Applications
*
Tapped and Untapped Versions
*
2500Vrms Minimum Isolation Voltage
*
Primary Lead Included
ELECTRICAL SPECIFICATIONS AT 25
O
C - OPERATING TEMPERATURE RANGE -40
O
C TO +80
O
C
CONTROL VALUES
PART
NUMBER
PM-CS01
PM-CS02
PM-CS03
PM-CS04
PM-CS05
PM-CS06
PM-CS07
PM-CS08
REFERENCE VALUES
CALC. VALUES
FLUX
FACTOR
K
B
LOSS
FACTOR
K
L
SCHEMATIC
DCR
TURNS INDUCTANCE
L
S
R
S
I
PK
R
T
K
V
DROOP
N
S
+ 1%
(mH Min.)
(Ohms Max.) (Amps) (Ohms)
(Volt/Amp)
(%)
50
100
200
300
50ct
100ct
200ct
300ct
5.0
20.0
80.0
180.0
5.0
20.0
80.0
180.0
0.70
1.40
4.50
11.00
0.50
1.00
2.00
3.00
35
50
50
75
35
50
50
75
15
50
200
300
15
50
200
300
0.30
0.50
1.00
1.00
0.30
0.50
1.00
1.00
2.4
2.0
2.0
1.4
2.4
2.0
2.0
1.4
273.97x10
3
68.49x10
3
17.12x10
3
7.61x10
3
273.97x10
3
68.49x10
3
17.12x10
3
7.61x10
3
3.31x10
- 9
3.33x10
- 9
3.35x10
- 9
3.37x10
- 9
3.31x10
- 9
3.33x10
- 9
3.35x10
- 9
3.37x10
- 9
A
A
A
A
B
B
B
B
REFER TO CALCULATION EXAMPLE FOR PM-CSXX SERIES ON PAGE 2 OF THIS DATA SHEET.
1) REFERENCE VALUES ARE FOR UNIPOLAR OPERATION @ 50KHz, 40% DUTY CYCLE (Dmax = .40).
2) THE MAXIMUM USABLE PEAK SENSE CURRENT (I
pk
) IS DEPENDENT ON CORE SATURATION FACTORS AND SHOULD BE
EVALUATED FOR THE ACTUAL OPERATING CONDITIONS. SEE APPLICATION DATA AND EXAMPLE ON PAGE 51.
3) THE MAXIMUM RECOMMENDED OPERATING FLUX DENSITY (B
OP
) @ AN OPERATING TEMPERATURE OF 105
O
C IS 2000 GAUSS.
4) THE TERM. RESISTOR (R
t
) CAN BE VARIED TO ADJUST THE OPERATING FLUX DENSITY (B
OP
), DROOP, AND SCALE FACTOR (K
V
).
5) THE SCALE FACTOR (K
V
) IS PROPORTIONAL TO THE TERMINATING RESISTOR (R
T
) AND IS EQUAL TO 1VOLT/AMP WHEN R = N
S
T
6) SECONDARY INDUCTANCE IS MEASURED AT 20KHz, 1.0VRMS.
SCHEMATIC
SCHEMATIC "A"
WHITE DOT
DENOTES PIN #1
MECHANICAL
PHYSICAL Dimensions in inches (mm)
1
1
1 TURN
PRIMARY
2
3
4
5
3
4
5
P
PM-CSXX
M
YYWW
2
.900
(22.86)
MAX.
.700
(17.78)
MAX.
UNUSED PINS MAY BE OMITTED
SCHEMATIC "B"
WHITE DOT
DENOTES PIN #1
.700
(17.78)
MAX.
1
1 TURN
PRIMARY
2
3
4
5
PINS 1 & 2
.052
∅
(1.3)
2
.700
(17.78)
TYP.
5
.250
(6.35)
TYP.
.250
(6.35)
TYP.
PINS 3 - 5
.032
∅
(0.8)
.150
(3.81)
MIN.
Specifications subject to change without notice.
20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630
•
TEL: (949) 452-0511
•
FAX: (949) 452-0512
•
http://www.premiermag.com
1
RoHS
*
High Current _ Primary Rated for 35 Amps RMS
*
Frequency Range from 50KHz to 500KHz
PM-CSXX
CURRENT SENSE
TRANSFORMERS
*
Designed for automatic pick and place
*
Maximum height = 10mm
ELECTRICAL SPECIFICATIONS AT 25
O
C - OPERATING TEMPERATURE RANGE -40
O
C TO +130
O
C
PART
NUMBER
PM-CS21
PM-CS22
PM-CS23
PM-CS24
PM-CS25
PM-CS26
TURNS
N
S
+ 1%
SEC INDUCTANCE
(mH Min.)
SEC DCR
(Ohms Max.)
PRI CURRENT
(Amps)
HIPOT
(Vrms)
1
1
1
1
1
1
: 30
: 50
: 70
: 100
: 200
: 300
0.50
1.40
2.70
5.60
22.0
50.0
0.34
0.57
0.80
1.50
5.00
12.0
35
35
35
35
35
35
500
500
500
500
500
500
SCHEMATIC
MECHANICAL
11
1 TURN
PRIMARY
12
2
SECONDARY
PHYSICAL Dimensions in inches (mm)
10
9
8
7
6
4
RECOMMEND LAYOUT
.090
(2.30)
.100
(2.54)
.050
(1.27)
P
PM-CSXX
M
YYWW
PIN#1 I.D.
WHITE DOT
1
2
3
4
5
.14
(3.5)
10
6
.27
(7.0)
9.65
(.38)
MAX
.028
(0.70)
.27
(7.0)
.61
(15.50)
.100
(2.54)
12.9
(.508)
12.9
(.508)
1
5
19.5
(4.95)
MAX
Specifications subject to change without notice.
20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630
•
TEL: (949) 452-0511
•
FAX: (949) 452-0512
•
http://www.premiermag.com
2
RoHS
APPLICATION EXAMPLE
APPLICATION EXAMPLE
GIVEN:
Part# = PM-CI02
Peak Current (I
PK
) = 30.0 Amps
Terminating Resistor (R
T
) = 100 Ohms
Operating Frequency (f) = 100KHz
Duty Cycle (Dmax) = .40 (40% on time)
CALCULATE OPERATING FLUX DENSISTY
From the Table the FLUX FACTOR is:
K
B
= 68.49 x 10
3
Flux Utilization Constant (K
F
) is:
1.0 For Unipolar Operation
2.0 For Bipolar Operation
THEN:
B
OP
= K
B
x I
PK
x R
T
x (Dmax / K
F
x f)
= 68.49x10
3
x 30 x 100 x (.4 / 1 x 100x10
3
)
= 822 gauss (OK less than 2000 gauss)
PM-CSXX
CURRENT SENSE
TRANSFORMERS
CALCULATE THE SCALE FACTOR
From the Table the Secondary Turns are:
N
S
= 100
THEN:
K
V
= R
T
/ N
S
= 100 / 100
= 1 volt/amp
ESTIMATE ERROR DUE TO LOSSES
From the Table the Secondary DCR is:
R
S
= 1.40 Ohms Maximum
From the Table the approximate Loss Factor is:
K
L
= 3.33 x 10
-9
Note: The loss factor (K
L
) is valid approximation
from10KHz to 200KHz
Secondary Copper Losses are:
P_loss
S
= (I
PK
/ N
S
)
2
x R
S
= (30/100)
2
x 1.40
CALCULATE PULSE DROOP
From the Table the Secondary Inductance is:
L
S
= 20mHy Minimum
Note: The actual droop is dependent on the actual L
S
in the circuits enviorment.
Droop Exponent (D) = R
T
x Dmax / (L
S
x f)
= 0.126 Watt
Core losses are:
P_loss
C
= K
L2
x f
1.621
x B
OP2.569
= (3.33x10
-9
)
2
x (100x10
3
)
1.621
x 822
2.569
= 0.0435 Watt
Output Power is:
= 100 x .4 / (20x10 x 100x10 )
P_out
S
= 0.020
= (30/100)
2
x 100
THEN:
%_Droop = (1-e
-D
) x 100
= 1.98 %
OK less than 10%
(Depending on the application
Droop to 20% may be acceptable)
Specifications subject to change without notice.
-3
3
= (I
PK
/ N
S
)
2
x R
T
= 9.00 Watt
THEN:
%_Error
= [(P_loss
S
+ P_loss
C
) / P_out] x 100
= [(.126 + .0435) / 9] x 100
= 1.88 %
20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630
•
TEL: (949) 452-0511
•
FAX: (949) 452-0512
•
http://www.premiermag.com
3
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