CURRENT SENSORS
Notices
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Important Notice
1. The content of this information is subject to change without
prior notice for the purpose of improvements, etc. Ensure that
you are in possession of the most up-to-date information when
using this product.
2. This product is intended to be used in general electronics
applications (electric home appliances, business equipment,
information equipment, communication terminal equipment,
measuring devices, industrial equipment, and so on). This
product is neither intended nor warranted for use in following
equipment or devices:
Special application (such as for medical devices,
transportation equipment, traffic signal control equipment,
fire and crime prevention equipment, aeronautics and
space devices, nuclear power control, fuel control, in-
vehicle equipment, safety devices, and so on) in which
extremely high quality and high reliability is required, or if
the malfunction or failures of product could be cause loss of
human life, bodily injury.
Tamura Corporation shall not be held responsible for any
damage incurred by customers or any third party when products
are used in special application, unless specifically permitted in
this document.
3. Tamura Corporation constantly strives to improve quality and
reliability, but malfunction or failures are bound to occur with
some probability in current sensor. To ensure that failures do
not cause accidents resulting in injury or death, fire accidents,
social damage, and so on, users are to thoroughly verify the
safety of their designs in devices and/or systems.
4. The operation examples and circuit examples shown in this
information are for reference purposes only, and Tamura
Corporation disclaims all responsibility for any violations of
industrial property rights, intellectual property rights and any
other rights owned by Tamura Corporation or third parties that
these may entail.
5. The circuit examples and part constants listed in these
specifications are provided as reference for the verification
of characteristics. The user is to perform design, verification,
and judgment under his or her own responsibility, taking into
account the various conditions.
6. The products are designed for use in environments where
consumer electronics are commonly used. It is not designed for
use in special environments such as listed below, and if such
use is considered, the user is to perform thorough safety and
reliability checks under his/her responsibility.
7. This product is not designed to resist radiation.
・Use in liquids such as water, oil, chemical solutions, or
organic solvents, and use in locations where the product will
be exposed to such liquids.
・Use that involves exposure to direct sunlight, outdoor
exposure, or dusty conditions.
・Use in locations where corrosive gases such as sea winds,
Cl2, H2S, NH3, SO2, or NO2, are present. (Some product
improves durability)
・Use in environments with strong static electricity or
electromagnetic radiation.
・Use that involves placing inflammable material next to the
product.
・Use of this product either sealed with a resin filling or coated
with resin.
・Use of water or a water soluble detergent for flux cleaning.
・Use in locations where condensation is liable to occur.
8. Do not use or otherwise make available the TAMUTA
products or the technology described in this document for any
military purposes, including without limitation, for the design,
development, use, stockpiling or manufacturing of mass
destruction weapons (e.g. nuclear, chemical, or biological
weapons or missile technology products). When exporting
and re-exporting the products or technology described in this
document, you should comply with the applicable export control
laws and regulations and follow the procedures required by
such laws and regulations including, without limitation, Japan
-Foreign Exchange and Foreign Trade Control Law and U.S.-
Export Administration Regulations. The TAMURA products
and related technology should not be used for or incorporated
into any products or systems whose manufacture, use, or sale
is prohibited under any applicable domestic or foreign laws or
regulations.
9. Please contact your TAMURA sales office for details as to
environmental matters such as the RoHS compatibility of
Product. Please use TAMURA products in compliance with all
applicable laws and regulations that regulate the inclusion or
use of controlled substances, including without limitation, the
EU RoHS Directive. TAMURA assumes no liability for damages
or losses occurring as a result of your noncompliance with
applicable laws and regulations.
10. TAMURA assumes no liability for damages or losses incurred by
you or third parties as a result of unauthorized use of TAMURA
products.
11. This document and any information herein may not be
reproduced in whole or in part without prior written permission
from TAMURA.
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CURRENT SENSORS
Appli note
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Application notes
<General Considerations>
1. The sensor uses polar electronic components. When the
polarity of the power supply is mistaken, the sensor is damaged.
2. Static electricity or excessive voltage can increase an offset
voltage in the Hall element, and cause offset voltage to change.
Please exercise care in handling and application.
3. In order to prevent the influence of noise, the use of twisted
cable or shielded cable for the output line is recommended
4. If using this device within a magnetic field generated by other
devices, the specified accuracy may not be obtainable.
5. Our products（several models are excluded ）are adjusted
with the trimming method by the measurement condition
（Load resistance, Power supply voltage）of specification
sheets. Therefore, characteristics（Offset, Output, etc.）and its
deviation may be changed in different circuit conditions from
the measurement condition. All change characteristic items are
not indicated on specification sheets.
6. The performance of current sensors with through-hole
（aperture）
is dependent on the position of the primary conductor. Tamura
specifications are based on a primary conductor completely
filling the through-hole（aperture）area.
7. The current sensor rated current in DC Amps.
8. Please use mating connector with equivalent terminal plating
material to insure proper operation and avoid possibility of
‘galvanic corrosion’
.
9. Please do not store in high-temperature and high-humidity
storage environment. Please use it after confirming soldering
when it is kept for six months or more.（product soldered with
substrate）
10. We recommend performing a zero offset adjustment by
measuring the offset voltage at startup. In continuously
operation for a few months, or at change of ambient
temperature or humidity is large, we recommend regularly
performing a zero offset adjustment at being idling（it is clear
that the current is not apply）.
<Open loop>
1. High frequency primary current may result in excessive heating
in iron magnetic core and cause damage to internal circuitry;
for high frequency applications select current sensor with ferrite
core material.
2. If the measured current exceeds the rated current, magnetic
core saturation will occur and the output voltage signal will not
be linearly proportional to the measured current.
<Closed Loop>
1. For closed loop current sensors please insure the power supply
voltage is balanced, symmetrical, and, applied simultaneously
to avoid potential increase in DC offset error.
2. Maximum rated current measurement duration is timedependent.
Maximum rated current applied in excess of the time limit can
result in damage to internal electronic circuitry; please consult
Tamura for assistance.
3. When using a measurement resistor to convert current output
to voltage output select a resistor with stable temperature
characteristic to insure accuracy of the output voltage.
4. Compensation current supplied to the secondary winding varies
in proportion to the measured current based on the conversion
ratio.（If/KN; KN ＝ secondary turns）Please insure the PSU
has required current capacity to supply compensation current
to the secondary winding.
<Flux-Gate>
1. Compensation current supplied to the secondary winding varies
in proportion to the measured current. Please insure the PSU
has required current capacity to supply compensation current
to the secondary winding.
2. There is 450kHz ripple voltage present on the output and
reference output voltage signals . An external capacitor maybe
added if necessary.
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DSP and ARM Processors
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