ZXCT1009

HIGH-SIDE CURRENT MONITOR

ZXCT1009

Document number: DS33441 Rev. 12 - 2

6 of 8

www.diodes.com

April 2011

© Diodes Incorporated

Application Information (cont.)

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 NTCof the device.

The figure opposite shows a PCB layout suggestion. The

resistor section is 25mm x 0.25mm giving approximately 150m

Ω

using 1oz copper. The data for the normalised graph was

obtained using a 1A load current and a 100

Ω output resistor. An

electronic version of the PCB layout is available through Diodes

applications group.

Effect of Sense Resisitor Material

on Temperature Performance

Layout shows area of shunt resistor compared to SOT23

package. Not actual size.

Ordering Information

Device

AEC-Q100

level

Reel

Size

Tape Width

Quantity per Reel

Part Marking

Package

ZXCT1009FTA

Grade 3

7”

8mm

3000 Units

109

SOT23

ZXCT1009F-7

None

7”

8mm

3000 Units

109

SOT23

ZXCT1009T8TA

None

7”

12mm

1000 Units

ZXCT1009

SM8