ZXCT1009F-7 Ver la hoja de datos (PDF) - Diodes Incorporated.

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ZXCT1009F-7

HIGH-SIDE CURRENT MONITOR

Diodes Incorporated. 

Typical Characteristics (cont.)

ZXCT1009

HIGH-SIDE CURRENT MONITOR

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 (θJA), maximum junction temperature

(TJMAX), and ambient temperature (TAMB), according to the

expression:

Application Information

The following text describes how to scale a load current

to an output voltage.

VSENSE = VIN - VLOAD

VOUT = 0.01 x VSENSE x ROUT1

PMAX = (TJMAX – TAMB) / θJA

E.g.

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

PD = IOUT(VIN -VOUT) W

A 1A current is to be represented by a 100mV output

voltage:

1) Choose the value of RSENSE to give 50mV >

VSENSE > 500mV at full load.

For example VSENSE = 100mV at 1.0A.

RSENSE = 0.1/1.0 => 0.1Ω.

2) Choose ROUT to give VOUT = 100mV, when

VSENSE = 100mV.

Rearranging 1 for Rout gives:

ROUT = VOUT /(VSENSE x 0.01)

ROUT = 0.1 / (0.1 x 0.01) = 100Ω

ZXCT1009

Document number: DS33441 Rev. 12 - 2

4 of 8

www.diodes.com

April 2011

© Diodes Incorporated

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