ZXCT1008(2004) 데이터 시트보기 (PDF) - Zetex => Diodes

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ZXCT1008
(Rev.:2004)

AUTOMOTIVE HIGH-SIDE CURRENT MONITOR

Zetex => Diodes 

APPLICATIONS INFORMATION

PCB trace shunt resistor for low

cost solution.

The figure below shows output characteristics of the

device when using a PCB resistive trace for a low

cost solution in replacement for a conventional

shunt resistor. The graph shows the linear rise in

voltage across the resistor due to the PTC of the

material and demonstrates how this rise in

resistance value over temperature compensates for

the NTC of the device.

The figure opposite shows a PCB layout suggestion.

The resistor section is 25mm x 0.25mm giving

approximately 150mΩ using 1oz copper. The data

for the normalised graph was obtained using a 1A

load current and a 100Ω output resistor. An

electronic version of the PCB layout is available at

www.zetex.com/isense

ZXCT1009

Vout

Vin

GND

Load

Actual Size

ZXCT1008

ZXCT1009

Vout

Vin

GND

Load

1.4

1.2

1.0

Voltage across

Copper Sense

Resistor

VOUT with Copper

Sense Resistor

0.8

VOUT with Ideal

Sense Resistor

-40 -20 0 20 40 60 80 100 120 140

Temperature (°C)

Effect of Sense Resistor Material

on Temperature Performance

Layout shows area of shunt

resistor compared to SOT23

package. Not actual size

ISSUE 2 - JULY 2004

7

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