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78250MVC 参数 Datasheet PDF下载

78250MVC图片预览
型号: 78250MVC
PDF下载: 下载PDF文件 查看货源
内容描述: MAX250兼容的转换器变压器 [MAX250 Compatible Converter Transformers]
分类和应用: 变压器转换器分离技术隔离技术
文件页数/大小: 3 页 / 150 K
品牌: MURATA [ MURATA MANUFACTURING CO., LTD. ]
 浏览型号78250MVC的Datasheet PDF文件第2页浏览型号78250MVC的Datasheet PDF文件第3页  
78250 Series
MAX250 Compatible Converter Transformers
CHARACTERISTICS 78250C/78250MC
Parameter
Primary Inductance, L
P
Leakage Inductance, L
L
Interwinding Capacitance, C
WW
Primary D.C. Resistance, R
DC
Volt-time Product, Et
Conditions
10kHz, 100mV
100kHz, 100mV
100kHz, 100mV
<0.1VDC
Pins1/2 or 2/3
Min.
1.0
Typ.
2.0
2.0
69
1.0
Max.
2.5
3.0
90
2.0
Units
mH
μH
pF
Ω
Vμs
50
FEATURES
RoHS compliant
Maxim MAX250 compatible
Isolation to 4kVrms
Industry-standard pinout
Surface mount option
UL 94 V-0 package materials
Low profile
Toroidal construction
Fully encapsulated
Industrial temperature range
CHARACTERISTICS 78250VC/78250MVC
Parameter
Primary Inductance, L
P
Leakage Inductance, L
L
Interwinding Capacitance, C
WW
Primary D.C. Resistance, R
DC
Volt-time Product, Et
Conditions
10kHz, 100mV
100kHz, 100mV
100kHz, 100mV
<0.1VDC
Pins1/2 or 2/3
Min.
1.0
Typ.
2.0
35
9
1.4
Max.
2.5
40
12
1.8
Units
mH
μH
pF
Ω
Vμs
50
ORDER CODE DETAILS
Order Code
78250C / 78250VC
78250MC / 78250MVC
78250MC-R / 78250MVC-R
Package Type
6 Pin DIL
6 Pin SM
6 Pin SM
Packaging Type
Tube
Tube
Tape & Reel
Quantity
50
50
500
ABSOLUTE MAXIMUM RATINGS
Operating free air temperature range
Storage temperature range
Lead temperature 1.5mm from case for 10 seconds
Peak current, I
PK
Isolation voltage 78250(M)C (flash tested for 1 second)
Isolation voltage 78250V(M)C (flash tested for 1 second)
All specifications typical at T
A
=25°C
DESCRIPTION
The 78250 series of converter transformers
are specifically designed for use with Maxim
chipsets to provide isolated RS232 interfaces.
Carefully controlled turns ratios ensure consistent
performance whilst a toroidal construction
minimises EMI.
-40°C to 85°C
-50°C to 125°C
300°C
300mA
1.5kVrms
4.0kVrms
TECHNICAL NOTES
ISOLATION
VOLTAGE
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Volt-
age’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’
are all terms that relate to the same thing, a test voltage,
applied for a specified time, across a component designed
to provide electrical isolation, to verify the integrity of that
isolation.
All products in this series are 100% production tested at
their stated isolation voltage.
A question commonly asked is, “What is the continuous
voltage that can be applied across the part in normal opera-
tion?”
For a part holding no specific agency approvals both input
and output should normally be maintained within SELV limits
i.e. less than 42.4V peak, or 60VDC. The isolation test volt-
age represents a measure of immunity to transient voltages
and the part should never be used as an element of a safety
isolation system. The part could be expected to function cor-
rectly with several hundred volts offset applied continuously
across the isolation barrier; but then the circuitry on both
sides of the barrier must be regarded as operating at an
unsafe voltage and further isolation/insulation systems must
form a barrier between these circuits and any user-acces-
sible circuitry according to safety standard requirements.
REPEATED HIGH-VOLTAGE ISOLATION TESTING
It is well known that repeated high-voltage isolation
testing of a barrier component can actually degrade
isolation capability, to a lesser or greater degree
depending on materials, construction and environ-
ment. This series has toroidal isolation transformers,
with no additional insulation between primary and
secondary windings of enameled wire. While parts
can be expected to withstand several times the
stated test voltage, the isolation capability does de-
pend on the wire insulation. Any material, including
this enamel (typically polyurethane) is susceptible
to eventual chemical degradation when subject to
very high applied voltages thus implying that the
number of tests should be strictly limited. We there-
fore strongly advise against repeated high voltage
isolation testing, but if it is absolutely required, that
the voltage be reduced by 20% from specified test
voltage.
This consideration equally applies to agency recog-
nized parts rated for better than functional isolation
where the wire enamel insulation is always supple-
mented by a further insulation system of physical
spacing or barriers.
 
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries - email:
mk@murata-ps.com,
tel:
+44 (0)1908 615232
KMP_78250C_C02
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