SMT Current Sense Transformers
EP 7 Core
Series/Type:
Ordering code:
Date:
Version:
B78417
2017-02-02
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Identification/Classification 1
SMT Current Sense Transformers
(header 1 + top left bar):
Identification/Classification 2
EP 7 Core
(header 2 + bottom left header bar):
Ordering code: (top right header bar)
Series/Type: (bottom right header bar)
B78417
Preliminary data (optional):
Department:
MAG TF T
Date:
2017-02-02
Version:
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
EP 7 Core
Construction
•
Ferrite core
•
Primary winding: frame molded in
•
Secondary winding: copper wire
•
Creepage distance Np/(Ns, core) 5 mm
•
Clearance distance Np/Ns (CuL) 3.2 mm
•
Clearance distance Np/core 3.5 mm
•
Plastic bobbin (UL94-V0, CTI
≥
175)
Features
•
Very low DC resistance
•
Different turns ratios
•
Small SMD package
•
RoHS compatible
•
Qualified to AEC-Q200
•
Insulation distances in compliance with IEC 60664
(Basic insulation, working voltage rms 500 V)
•
UL 1446 Class 155 (F) electrical insulation system
Applications
•
Switch-mode power supplies
•
Feedback control
•
Overload sensing
•
Load drop/shut-down detection
Terminals
•
L-Pins
B78417
Marking
•
Product brand, middle block of ordering code, date code, pin 1 marker, production place
identification code
Delivery mode and packing units
•
Blister tape
•
Packing unit 320 pcs
2017-02-02
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 8
SMT Current Sense Transformers
EP 7 Core
Dimensional drawing
B78417
2017-02-02
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 8
SMT Current Sense Transformers
EP 7 Core
Application circuit and pinning
B78417
Technical data and measuring conditions
Typical frequency range
High voltage test
Inductance L (5-4)
DC resistance R
max
(1-2)
DC resistance R
max
(5-4)
Sensed current: I
prim, RMS
Couple capacitance C
p
(1-5)
Resistance to reflow soldering
heat
Operating temperature range
Pollution degree
Insulation thermal class
Weight
Approvals
50 … 250 kHz
2400 V AC, 50 Hz, 1 s (winding to winding)
Type test 60 s
Measured at 20 kHz, 10 mV, +25 °C
Measured at +25 °C
Measured at +25 °C
The max. primary current of 20 A causes approx.
+40 °C temperature rise
Measured at 10 kHz, 1 V, +25 °C
In accordance with JEDEC J-STD-020D
+245 °C for 20 seconds
−40
°C … +150 °C (component)
P2 (to IEC 60664)
155°C (F) (to IEC 60085)
Approx. 2.5 g
UL 1446 class 155 (F) (E320370)
2017-02-02
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 8
SMT Current Sense Transformers
EP 7 Core
B78417
=
,
×
×
×
With:
,
Maximum magnetic flux density in the ferrite core of the current sense transformer
Maximum output voltage of the measurement signal
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
Typical value for : 10.6 x 10-6 m
2
: < 220 mT
Typical
=
,
,
×
With:
,
Resistance of burden resistor
Maximum output voltage of the measurement signal
,
Number of turns on the secondary side of the CST
Maximum primary current (peak current)
Characteristics and ordering codes
L
min
(5-4)
mH
1.7
3.0
7.0
11.0
Turns
ratio
Np : Ns
1:50
1:70
1:100
1:125
Voltage-
C
p
time product
+120 °C
V · µs
pF
116
163
233
291
4
4
4
4
R
max
(1-2)
mΩ
1.9
1.9
1.9
1.9
R
max
(4-5)
Ω
2.1
2.9
5.0
5.3
Recommended.
R
T
Ω
50
70
100
125
Ordering Code
B78417A2285A003
B78417A2286A003
B78417A2185A003
B78417A2287A003
2017-02-02
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 8
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