SMT current sense transformers
EE 12.6
Series/Type:
B82801C
Date:
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 reel
■ Carton packaging
■ Packing units: 200 pcs./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
50 ... 500 kHz
Hi-pot
1500 V AC, 50 Hz, 2 s (winding to winding)
Inductance L (2-4)
100 kHz, 100 mV, @ +25 °C
DC resistance Rmax
Measured at +25 °C (specified per winding)
Sensed current
The max. primary current of 40 A causes approx. +40 °C
temperature rise
Solderability
t99.9 Sn, lead-free. Or
Sn96.5Ag3.0Cu0.5: +(245 r5°C, (3 r03) s
Wetting of soldering area t 95%
(to IEC 60068-2-58)
Resistance to soldering heat
+(260 r 5) °C, (10 r1 s) to IEC 60068-2-58
Storage conditions
–20 °C … +40 °C, d75% RH
Operating temperature range
40 °C … +125 °C
Weight
Approx. 4.8 g
Please read Cautions and warnings and
Important notes at the end of this document.
4
03/17
SMT current sense transformers
B82801C
EE12.6
V sense max G max
B max = ----------------------------------------n s A e f osc
With:
Bmax
Maximum magnetic flux density in the ferrite core of the current sense transformer
Vsense,max Maximum output voltage of the measurement signal
Gmax
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: 12.4 x 10-6 m2
Typical Bmax: 200 mT
V sense max n s
R T = ----------------------------------I prim max
With:
RT
Resistance of burden resistor
Vsense,max Maximum output voltage of the measurement signal
ns
Number of turns on the secondary side of the CT
Iprim,max
Maximum primary current (peak current)
Characteristics and ordering codes
Lmin
Turns ratio DC resistance
Rmax (m:)
mH
Np : Ns
primary
1.4
1 : 50
0.28
400
124
50
B82801C0145A050
5.6
1 : 100
0.28
1000
248
100
B82801C0565A100
12.6
1 : 150
0.28
2200
372
150
B82801C1265A150
22.4
1 : 200
0.28
2900
496
200
B82801C2245A200
Recomm. Ordering code
Voltagetime product RT
secondary V µs
Please read Cautions and warnings and
Important notes at the end of this document.
5
:
03/17
SMT current sense transformers
B82801C
EE12.6
Taping and packing
Blister tape
Dimensions in mm
Dimensions in mm
Reel
Dimensions in mm
Please read Cautions and warnings and
Important notes at the end of this document.
6
03/17
SMT current sense transformers
B82801C
EE12.6
Recommended reflow soldering curve
Pb-free solder material (based on JEDEC J-STD 020D)
T1
T2
T3
T4
T1
T2
T3
°C
°C
°C
°C
sec
sec
sec
150
200
217
245
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