SMT current sense transformers
EE 5.0 core
Series/Type:
B82801B
Date:
August 2015
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EPCOS AG 2015. 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
B82801B
EE 5.0 core
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
■ 16 mm blister tape, 330 mm reel
■ Carton packaging
■ Packing units: 900 pcs./reel;
7200 pcs./carton
Please read Cautions and warnings and
Important notes at the end of this document.
2
08/15
SMT current sense transformers
B82801B
EE 5.0
Dimensional drawing
Dimensions in mm
Application circuit and pinning
Please read Cautions and warnings and
Important notes at the end of this document.
3
08/15
SMT current sense transformers
B82801B
EE 5.0
Technical data and measuring conditions
Frequency range
50 kHz ... 1 MHz
Hi-pot
1000 V AC, 50 Hz, 2 s (winding to winding)
Inductance L (1-3)
100 kHz, 100 mV, @ +25 °C
DC resistance Rmax
Measured at +25 °C
Sensed current
The max. primary current of 20 A causes approx. +40 °C
temperature rise
Solderability
99.9 Sn, lead-free. Or
Sn96.5Ag3.0Cu0.5: +(245 5°C, (3 03) s
Wetting of soldering area 95%
(to IEC 60068-2-58)
Resistance to soldering heat
+(260 5) °C, (10 1) s to IEC 60068-2-58
Storage conditions
–20 °C … +40 °C, 75% RH (packaged)
Operating temperature range
40 °C … +125 °C
Weight
Approx. 0.4 g
Please read Cautions and warnings and
Important notes at the end of this document.
4
08/15
SMT current sense transformers
B82801B
EE 5.0
V sense max max
B max = ----------------------------------------n s A e f osc
With:
Maximum magnetic flux density in the ferrite core of the current sense transformer
Bmax
Vsense,max Maximum output voltage of the measurement signal
max
Maximum duty cycle
ns
Number of turns of the secondary winding of the current sense transformer
Ae
Effective magnetic area of the ferrite core
fosc
Operating frequency of the switching operator IC
Typical value for Ae: 2.5 x 10-6 m2
Typical Bmax: 200 mT
V sense max n s
R T = ----------------------------------I prim max
With:
RT
Vsense,max
ns
Iprim,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
Lmin
H
Turns ratio DC resistance
Rmax (m)
Recomm. Ordering code
Voltagetime product RT
primary
1 : 20
0.6
180
1 : 30
0.6
870
15.0
30
B82801B0184A030
320
1 : 40
0.6
1140
20.0
40
B82801B0324A040
500
1 : 50
0.6
1500
25.0
50
B82801B0504A050
720
1 : 60
0.6
1980
30.0
60
B82801B0724A060
secondary
400
V µs
Np : Ns
80
10.0
20
B82801B0803A020
980
1 : 70
0.6
3000
35.0
70
B82801B0984A070
2000
1 : 100
0.6
5500
50.0
100
B82801B0205A100
3000
1 : 125
0.6
6500
62.5
125
B82801B0305A125
8000
1 : 200
0.6
33240
100.0
200
B82801B0925A200
Please read Cautions and warnings and
Important notes at the end of this document.
5
08/15
SMT current sense transformers
B82801B
EE 5.0
Taping and packing
Blister tape
Dimensions in mm
Reel
Dimensions in mm
Please read Cautions and warnings and
Important notes at the end of this document.
6
08/15
SMT current sense transformers
B82801B
EE 5.0
Recommended reflow soldering curve
Pb-free solder material (based on JEDEC J-STD 020D)
T2
T3
T4
T1
°C
°C
°C
°C
sec
sec
sec
150
200
217
245
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