B78419 [TDK]
SMT Current Sense Transformers;
| 型号： | B78419 |
| 厂家： | 
TDK ELECTRONICS |
| 描述： | SMT Current Sense Transformers |
| 文件： | 总8页 (文件大小：215K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SMT Current Sense Transformers
EP 10 Core
Series/Type:
B78419
Ordering code:
Date:
2015-11-25
Version:
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Identification/Classification 1
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Identification/Classification 2
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Ordering code: (top right header bar)
Series/Type: (bottom right header bar)
Preliminary data (optional):
Department:
SMT Current Sense Transformers
EP 10 Core
B78419
MAG TF T PD
2015-11-25
Date:
Version:
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
EP 10 Core
B78419
Construction
• Ferrite core
• Primary winding: frame molded in
• Secondary winding: copper wire
• Creepage distance Np/(Ns, core) 6 mm
• Clearance distance Np/Ns (CuL) 3.5 mm
• Clearance distance Np/core 5.3 mm
• Plastic bobbin (UL94-V0, CTI ≥ 175)
Features
• Very low DC resistance
• Different turn ratios
• Small SMD package
• RoHS compatible
• Qualified to AEC-Q200
• Design complies with IEC 61558-2-16 (Basic insulation, working voltage rms 500 V)
• Insulation distances in compliance with IEC 60664
(Basic insulation, working voltage rms 500 V)
Applications
• Switch-mode power supplies
• Feedback control
• Overload sensing
• Load drop/shut down detection
Terminals
• L-Pins
Marking
• Product brand, middle block of ordering code, date code, pin 1 marker, production place
identification code
Delivery mode and packing unit
• Blister tape
• Packing unit 200 pcs
MAG TF T PD
2015-11-25
Please read Cautions and warnings and
Page 2 of 8
Important notes at the end of this document.
SMT Current Sense Transformers
EP 10 Core
B78419
Dimensional drawing
MAG TF T PD
2015-11-25
Please read Cautions and warnings and
Page 3 of 8
Important notes at the end of this document.
SMT Current Sense Transformers
EP 10 Core
B78419
Application circuit and pinning
Technical data and measuring conditions
Typical Frequency range
High Voltage
50 … 250 kHz
2400 V AC, 50 Hz, 1 s (winding to winding)
Type test 60 s
Inductance L (5-4)
Measured at 20 kHz, 10 mV, 25°C
Measured at 25°C
DC resistance Rmax (1-2)
DC resistance Rmax (5-4)
Sensed current: Iprim,RMS
Measured at 25°C
The max. primary current of 30 A causes approx.
+40 °C temperature rise
Couple capacitance Cp (1-5)
Measured at 10 kHz, 1 V, 25°C
Resistance to reflow soldering
heat
In accordance with JEDEC J-STD-020D
+245 °C for 20 seconds
Operating temperature range
Pollution degree
−40 °C … +150 °C (component)
P2 (to IEC 61558-1, 60664)
155°C (F) (to IEC 60085)
Approx. 5 g
Insulation thermal class
Weight
MAG TF T PD
2015-11-25
Please read Cautions and warnings and
Page 4 of 8
Important notes at the end of this document.
SMT Current Sense Transformers
EP 10 Core
B78419
ꢄ
ꢅꢆꢇ,ꢁꢂꢃ × ꢈꢁꢂꢃ
ꢀꢁꢂꢃ
=
ꢉꢊ × ꢋꢌ × ꢍꢅꢊꢎ
With:
ꢀꢁꢂꢃ
Maximum magnetic flux density in the ferrite core of the current sense transformer
Maximum output voltage of the measurement signal
ꢄꢅꢆꢇ,ꢁꢂꢃ
ꢈꢁꢂꢃ
ꢉꢊ
Maximum duty cycle
Number of turns of the secondary winding of the current sense transformer
Effective magnetic area of the ferrite core
ꢋꢌ
ꢍꢅꢊꢎ
Operating frequency of the switching operator IC
Typical value for ꢋꢌ: 10.7 x 10-6 m2
Typical ꢀꢁꢂꢃ: < 220 mT
ꢄ
ꢅꢆꢇ,ꢁꢂꢃ × ꢉꢊ
ꢏꢐ =
ꢑꢒꢓꢔꢁ,ꢁꢂꢃ
With:
ꢏꢐ
Resistance of burden resistor
ꢄꢅꢆꢇ,ꢁꢂꢃ
ꢉꢊ
Maximum output voltage of the measurement signal
Number of turns on the secondary side of the CST
Maximum primary current (peak current)
ꢑꢒꢓꢔꢁ,ꢁꢂꢃ
Characteristics and ordering codes
Lmin
Turns
Voltage-
Cp
Rmax
Rmax
Recommended Ordering Code
(5-4) Ratio
time product
(1-2) (4-5) RT
+120°C
mH
Np : Ns V · µs
pF
4
mΩ
0.5
0.5
0.5
0.5
0.5
Ω
Ω
1.7 1:50
117
164
235
294
423
1.5
2.1
3.1
4.0
7.4
50
B78419A2288A003
B78419A2289A003
B78419A2251A003
B78419A2290A003
B78419A2271A003
3.0 1:70
7.0 1:100
11.0 1:125
25.0 1:180
4
70
100
125
180
4
4
4
MAG TF T PD
2015-11-25
Please read Cautions and warnings and
Page 5 of 8
Important notes at the end of this document.
SMT Current Sense Transformers
EP 10 Core
B78419
Taping and packing
Blister tape
Reel
MAG TF T PD
2015-11-25
Please read Cautions and warnings and
Page 6 of 8
Important notes at the end of this document.
Cautions and warnings
■ Please note the recommendations in our Inductors data book (latest edition) and in the data
sheets.
– Particular attention should be paid to the derating curves given there.
– The soldering conditions should also be observed. Temperatures quoted in relation to wave
soldering refer to the pin, not the housing.
■ If the components are to be washed varnished it is necessary to check whether the washing
varnish agent that is used has a negative effect on the wire insulation, any plastics that are used,
or on glued joints. In particular, it is possible for washing varnish agent residues to have a
negative effect in the long-term on wire insulation Washing processes may damage the product due
to the possible static or cyclic mechanical loads (e.g. ultrasonic cleaning). They may cause cracks to
develop on the product and its parts,
which might lead to reduced reliability or lifetime.
■ The following points must be observed if the components are potted in customer applications:
– Many potting materials shrink as they harden. They therefore exert a pressure on the plastic
housing or core. This pressure can have a deleterious effect on electrical properties, and in
extreme cases can damage the core or plastic housing mechanically.
– It is necessary to check whether the potting material used attacks or destroys the wire
insulation, plastics or glue.
– The effect of the potting material can change the high-frequency behaviour of the
components.
■ Ferrites are sensitive to direct impact. This can cause the core material to flake, or lead to breakage
of the core.
■ Even for customer-specific products, conclusive validation of the component in the circuit can only
be carried out by the customer.
Display of ordering codes for EPCOS products
The ordering code for one and the same EPCOS product can be represented differently in data
sheets, data books, other publications, on the EPCOS website, or in order-related documents such as
shipping notes, order confirmations and product labels. The varying representations of the
ordering codes are due to different processes employed and do not affect the specifications of
the respective products. Detailed information can be found on the Internet under
www.epcos.com/orderingcodes
MAG TF T PD
2015-11-25
Please read Cautions and warnings and
Page 7 of 8
Important notes at the end of this document.
Important notes
The following applies to all products named in this publication:
1. Some parts of this publication contain statements about the suitability of our products for
certain areas of application. These statements are based on our knowledge of typical
requirements that are often placed on our products in the areas of application concerned. We
nevertheless expressly point out that such statements cannot be regarded as binding
statements about the suitability of our products for a particular customer application. As a
rule, EPCOS is either unfamiliar with individual customer applications or less familiar with them
than the customers themselves. For these reasons, it is always ultimately incumbent on the
customer to check and decide whether an EPCOS product with the properties described in the
product specification is suitable for use in a particular customer application.
2. We also point out that in individual cases, a malfunction of electronic components or failure
before the end of their usual service life cannot be completely ruled out in the current state
of the art, even if they are operated as specified. In customer applications requiring a very high
level of operational safety and especially in customer applications in which the malfunction or
failure of an electronic component could endanger human life or health (e.g. in accident
prevention or life-saving systems), it must therefore be ensured by means of suitable design of the
customer application or other action taken by the customer (e.g. installation of protective circuitry
or redundancy) that no injury or damage is sustained by third parties in the event of malfunction or
failure of an electronic component.
3. The warnings, cautions and product-specific notes must be observed.
4. In order to satisfy certain technical requirements, some of the products described in this
publication may contain substances subject to restrictions in certain jurisdictions (e.g.
because they are classed as hazardous). Useful information on this will be found in our Material
Data Sheets on the Internet (www.epcos.com/material). Should you have any more detailed
questions, please contact our sales offices.
5. We constantly strive to improve our products. Consequently, the products described in this
publication may change from time to time. The same is true of the corresponding product
specifications. Please check therefore to what extent product descriptions and specifications
contained in this publication are still applicable before or when you place an order.
We also reserve the right to discontinue production and delivery of products. Consequently,
we cannot guarantee that all products named in this publication will always be available.
The aforementioned does not apply in the case of individual agreements deviating from the
foregoing for customer-specific products.
6. Unless otherwise agreed in individual contracts, all orders are subject to the current version of
the “General Terms of Delivery for Products and Services in the Electrical Industry”
published by the German Electrical and Electronics Industry Association (ZVEI).
7. The trade names EPCOS, Alu-X, CeraDiode, CeraLink, CeraPad, CeraPlas, CSMP, CSSP,
CTVS, DeltaCap, DigiSiMic, DSSP, ExoCore, FilterCap, FormFit, LeaXield, MiniBlue, MiniCell,
MKD, MKK, MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, PhiCap, PQSine, SIFERRIT,
SIFI, SIKOREL, SilverCap, SIMDAD, SiMic, SIMID, SineFormer, SIOV, SIP5D, SIP5K, TFAP,
ThermoFuse, WindCap are trademarks registered or pending in Europe and in other countries.
Further information will be found on the Internet at www.epcos.com/trademarks.
Page 8 of 8
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