SMT current sense transformers
EE 4.2 core
Series/Type:
Date:
B82801A
May 2016
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EPCOS AG 2016. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS’ prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
SMT current sense transformers
SMT current sensor transformers
Applications
■
■
■
■
B82801A
EE 4.2
Switching power supplies
Feedback control
Overload sensing
Load drop/shut down detection
Features
■
■
■
■
Very low DC resistance
Different turns ratios
Very small package
RoHS compatible
Marking
No marking on component
Delivery mode and packing units
■
12 mm blister tape, 178 mm
■
Carton packaging
■
Packing units: 600 pcs./reel;
reel
3000 pcs./carton
Please read
Cautions and warnings
and
Important notes
at the end of this document.
2
05/16
SMT current sense transformers
SMT current sensor transformers
Dimensional drawing
B82801A
EE 4.2
Dimensions in mm
Application circuit and pinning
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
05/16
SMT current sense transformers
B82801A
EE 4.2
Technical data and measuring conditions
Frequency range
Hi-pot
Inductance L (1-2)
DC resistance R
max
Sensed current
Solderability
50 kHz ... 1 MHz
500 V AC, 50 Hz, 2 s (winding to winding)
100 kHz, 100 mV, @ +25 °C
Measured at +25 °C
The max. primary current of 7 A causes approx. +40 °C
temperature rise
99.9 Sn, lead-free. Or
Sn96.5Ag3.0Cu0.5: +(245 5 °C, (3 0 3) s
Wetting of soldering area 95%
(to IEC 60068-2-58)
+(260
5) °C, (10
1) s to IEC 60068-2-58
75% RH
–20 °C … +40 °C,
40 °C … +125 °C
Approx. 0.15 g
Resistance to soldering heat
Storage conditions
Operating temperature range
Weight
Please read
Cautions and warnings
and
Important notes
at the end of this document.
4
05/16
SMT current sense transformers
B82801A
EE 4.2
B
max
With:
B
max
max
V
sense max max
=
-----------------------------------------
n
s
A
e
f
osc
Maximum magnetic flux density in the ferrite core of the current sense transformer
Maximum duty cycle
Number of turns of the secondary winding of the current sense transformer
Effective magnetic area of the ferrite core
Operating frequency of the switching operator IC
V
sense,max
Maximum output voltage of the measurement signal
n
s
A
e
f
osc
Typical value for A
e
: 1.44 x 10
-6
m
2
Typical B
max
: 200 mT
V
sense max
n
s
-
R
T
=
----------------------------------
I
prim max
With:
R
T
V
sense,max
n
s
I
prim,max
Resistance of burden resistor
Maximum output voltage of the measurement signal
Number of turns on the secondary side of the CT
Maximum primary current (peak current)
Characteristics and ordering codes
L
min
H
33
74
132
205
295
400
820
1280
1840
Turns ratio DC resistance
R
max
(m )
N
p
: N
s
1 : 20
1 : 30
1 : 40
1 : 50
1 : 60
1 : 70
1 : 100
1 : 125
1 : 150
primary
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
secondary
320
800
1300
2200
3600
4600
8700
13000
21000
Voltage-
Recomm. Ordering code
time product R
T
V
µs
5.76
8.6
11.5
14.4
17.3
20.0
28.8
36.0
43.2
20
30
40
50
60
70
100
125
150
B82801A0333A020
B82801A0743A030
B82801A0134A040
B82801A0214A050
B82801A0304A060
B82801A0404A070
B82801A0824A100
B82801A0135A125
B82801A0185A150
Please read
Cautions and warnings
and
Important notes
at the end of this document.
5
05/16
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