P
Premier
M
Magnetics Inc.
"INNOVATORS IN MAGNETICS TECHNOLOGY"
!
Designed for Switch Mode Power Supply Applications
"
Tapped and Untapped Versions
#
Frequency Range from 10KHz to 200KHz
$
2500Vrms Minimum Isolation Voltage
%
Fully Encapsulated Construction
&
Center Hole for Primary Lead
ELECTRICAL SPECIFICATIONS AT 25
O
C - OPERATING TEMPERATURE RANGE -40
O
C TO +80
O
C
CONTROL VALUES
PART
NUMBER
PM-CI01
PM-CI02
PM-CI03
PM-CI04
PM-CI05
PM-CI06
PM-CI07
PM-CI08
TURNS
N
S
+ 1%
PM-CIXX
CURRENT SENSE
INDUCTORS
REFERENCE VALUES
CALC. VALUES
FLUX
FACTOR
K
B
LOSS
FACTOR
K
L
SCHEMATIC
INDUCTANCE
DCR
R
T
K
V
L
S
R
S
DROOP
I
PK
(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
9.00
0.70
1.40
4.50
9.00
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-CIXX 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
T
= N
S
6) SECONDARY INDUCTANCE IS MEASURED AT 20KHz, 1.0VRMS.
SCHEMATIC
SCHEMATIC "A"
MECHANICAL
PHYSICAL Dimensions in inches (mm)
.410
(10.4)
MAX
.35
(8.8)
.838
(21.3)
MAX
.180 DIA.
(4.57) MIN
1
3
SCHEMATIC "B"
1
P
PM-CIXX
M
YYWW
2
3
∅
.030
(.762)
3
ARROW INDICATES
CURRENT FLOW
PIN#1 IN PHASE
1
2
3
Specifications subject to change without notice.
.040
(1.02)
LEAD 2 PRESENT
ON CENTER TAPPED
VERSION ONLY
.500
(12.70)
.250
(6.35)
.19
(4.8)
pmci 4/97
20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630
•
TEL: (949) 452-0511
•
FAX: (949) 452-0512
•
http://www.premiermag.com
1
P
Premier
M
Magnetics Inc.
"INNOVATORS IN MAGNETICS TECHNOLOGY"
PM-CIXX
CURRENT SENSE
INDUCTORS
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
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)
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 %
pmci 4/97
20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630
•
TEL: (949) 452-0511
•
FAX: (949) 452-0512
•
http://www.premiermag.com
2
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