ZXCT1012ET5TA datasheet(7/10 Pages) ZETEX

Part #	ZXCT1012ET5TA

Description	Reduced height micro-power current monitor

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Manufacturer	ZETEX [Zetex Semiconductors]

Direct Link	http://www.diodes.com/

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7 / 10 page

ZXCT1012

Issue 1 - December 2006

7

www.zetex.com

Power dissipation

The maximum allowable power dissipation of the device for normal operation (PMAX), is a

function of the package junction to ambient thermal resistance ( JA), maximum junction

temperature (TJMAX), and ambient temperature (Tamb), according to the expression:

PMAX = (TJMAX – Tamb) / JA

The device power dissipation, PD is given by the expression:

PD=IOUT.(VIN-VOUT) watts

Care must be taken when using this device at large input voltages and large sense voltages to

prevent too much power dissipation.

VIN

= 20V

VSENSE = 2.5V

ROUT

= 100

IOUT

= 2.5 x 0.01

= 25mA

VOUT

= IOUT x ROUT

= 25mA x 100

= 2.5V

∴ P

D

= 25mA (20 - 2.5)V

= 438mW

Power Dissipation

0

100

200

300

400

500

600

0

255075

100

125

150

TA - Ambient temperature (°C)

TDFN3x3-5

TSOT23-5

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ZXCT1012ET5TA Datasheet(PDF) 7 Page - Zetex Semiconductors

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