ZXCT1008(2004) 查看數據表（PDF） - Zetex => Diodes

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ZXCT1008
(Rev.:2004)

AUTOMOTIVE HIGH-SIDE CURRENT MONITOR

Zetex => Diodes 

ZXCT1008

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:

Pmax = (Tjmax – Tamb) / θja

The device power dissipation, PD is given by the

expression:

PD=Iout.(Vin-Vout) Watts

APPLICATIONS INFORMATION

The following lines describe how to scale a load

current to an output voltage.

Vsense = Vin - Vload

Vout = 0.01 x Vsense x Rout1

E.g.

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 => 0.1 Ω

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) = 100 Ω

ISSUE 2 - JULY 2004

5

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