LRC12JTRWAR010 datasheet, PDF - EEWORLD Datasheet

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LRC12JTRWAR010: DescriptionChip Current Sense / Open-Air Current Shunts / Axial Current Sense Resistors; File Size1MB，58 Pages; ManufacturerToken Electronics Industry Co., Ltd.; Websitehttp://www.token.com.tw/

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LRC12JTRWAR010 Overview

Chip Current Sense / Open-Air Current Shunts / Axial Current Sense Resistors

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TOKEN

Current

Sensing

Resistors

Chip Current Sense / Open-Air Current Shunts /

Axial Current Sense Resistors

Token Electronics Industry Co., Ltd

Taiwan:

No. 137, Sec. 1, Chung Shin Rd., Wu Ku Hsiang, Taipei Hsien, Taiwan, R.O.C

TEL: 886-2-2981 0109; FAX: 886-2-2988 7487

China:

12F, Zhongxing Industry Bld., Chuangye Rd., Nanshan District, Shenzhen, Guangdong

TEL: 86-755-2605 5363, 2605 5364; FAX: 86-755-2605 5365

http://www.token.com.tw

rfq token.com.tw

TOKEN

Information of Current Sensing Resistors

Information of

Current Sensing

Resistors

You Current Options - Token Current Sense

As the world becomes more and more technology-driven, the uses for current sensing resistors will

continue to increase. The need for even lower resistance value ranges is already becoming evident,

as is the need for these resistors to handle more power. The industry-wide trend is the emergence of

smaller and smaller products.

Token Electronics offers a wide variety of current sensing products from the industry to military

standards, such as current sense in Thin-Film / Thick-Film Technology, Bare Element Resistors,

and Open Air Shunts. This enables Token to present an astounding number of possible solutions

for any circuit design needs.

Applications of Current Detecting Resistors

Token’s TCS and CS Series unique form factor provides automotive designers with several

advantages. Both TCS and CS Series are ideal for applications involving window lift motors,

fuel pump systems, seat belt pretensioners, and pulsewidth modulator feedback.

The wider resistive element and lower resistance enables higher current to pass through the device.

Token’s LRC ultra low ohmic metal strip chip series provides the inherent ability to flex slightly and

offers stress relief during extreme temperature cycling on typical or metal substrates. This LRC series

is suitable for switch power supply applications (DC-DC Converter, Charger, Adaptor) and power

management of monitor.

The open air design of bare element resistor LRA and LRB Series provide a far cooler operation by

allowing more air flow under the resistive element to keep excess heat from being transmitted to the

PC board. They are suitable for high power AC/DC detection of power supply circuit.

Token axial moulded BWL series provides power rating up to 10 watts and lower resistance 0.005Ω,

is ideal for all types of current sensing applications including switching and linear power supplies,

instruments and power amplifiers.

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TOKEN

Design & Select Current Sense Resistors

Design & Select

Current Sense

Resistors

Point 1 - Power Rating

Calculate the power dissipation under operating conditions

Equation: Pavg = IRMS2 × R; where Power (P), Current (I), Root Mean Square (RMS),

Resistance (R).Allowing

for transient or fault conditions and high ambient temperature if applicable,

select the required power rating.For many current sense products, only the maximum temperature of

the solder joints limits the power rating.Power rating is thus a function of the PCB layout design as

well as of component selection (see point 4.).

Point 2 - Resistance Value

Determine the minimum suitable resistance value. This is the lowest value of peak sense voltage

consistent with an acceptable signal to noise ratio, divided by the peak current to be measured.

Point 3 - Temperature Coefficient of Resistance (TCR)

Establish the accuracy needed in terms of a tolerance on the value and of sensitivity to temperature.

The latter factor is quoted as Temperature Coefficient of Resistance (TCR), defined as the value

change in parts per million for a 1°C temperature rise. It is generally higher for low value resistors

because the metallic leads or terminations, which have a very high TCR, make up a significant part of

the total resistance value.

To achieve acceptable accuracy it is normally necessary to make four-terminal (Kelvin) connections

to the resistor. This means connecting the current carrying tracks and the voltage sense tracks directly

to the component pads. Even when this is done, there is still some pad area and solder in series with

the resistor, which may compromise the actual tolerance and TCR of the soldered part. For very high

accuracy or very low values, a four-terminal resistor type is the best choice.

Point 4 - PCB Layout

Care must be taken when laying out a PCB if the stated performance of a sense resistor is to be

achieved. The current carrying tracks should be as wide as possible, using multiple layers connected

by many vias near the component pad. This also improves the heatsinking of the joints.

The best way to make four-terminal connections to a two-terminal through-hole resistor is to use

different sides of the PCB for the current and voltage connections. Failing this, current and voltage

tracks should connect to opposite sides of the component pad.

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