SMT current sense transformers
EE 12.6
Series/Type:
Date:
B82801C
March 2017
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EPCOS AG 2017. 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
B82801C
EE12.6
Application
■
■
■
■
Switching power supplies
Feedback control
Overload sensing
Load drop/shut down detection
Features
■
■
■
■
■
Very low DC resistance
Different turns ratios
Small package
Other pinning on request
RoHS compatible
Marking
Middle block of ordering code
Delivery mode and packing units
■
32 mm blister tape, 330 mm
■
Carton packaging
■
Packing units: 200 pcs./reel;
reel
800 pcs./carton
Please read
Cautions and warnings
and
Important notes
at the end of this document.
2
03/17
SMT current sense transformers
B82801C
EE12.6
Dimensional drawing
Dimensions in mm
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
03/17
SMT current sense transformers
B82801C
EE12.6
Application circuit and pinning
Technical data and measuring conditions
Frequency range
Hi-pot
Inductance L (2-4)
DC resistance R
max
Sensed current
Solderability
50 ... 500 kHz
1500 V AC, 50 Hz, 2 s (winding to winding)
100 kHz, 100 mV, @ +25 °C
Measured at +25 °C (specified per winding)
The max. primary current of 40 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. 4.8 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
03/17
SMT current sense transformers
B82801C
EE12.6
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
: 12.4 x 10
-6
m
2
Typical B
max
: 200 mT
V
sense max
n
s
-
R
T
=
----------------------------------
I
prim max
With:
R
T
n
s
I
prim,max
Resistance of burden resistor
Number of turns on the secondary side of the CT
Maximum primary current (peak current)
V
sense,max
Maximum output voltage of the measurement signal
Characteristics and ordering codes
L
min
mH
1.4
5.6
12.6
22.4
Turns ratio DC resistance
R
max
(m )
N
p
: N
s
1 : 50
1 : 100
1 : 150
1 : 200
primary
0.28
0.28
0.28
0.28
400
1000
2200
2900
Recomm. Ordering code
Voltage-
time product R
T
124
248
372
496
50
100
150
200
B82801C0145A050
B82801C0565A100
B82801C1265A150
B82801C2245A200
secondary V µs
Please read
Cautions and warnings
and
Important notes
at the end of this document.
5
03/17
