ZXCT1010E5 データシートの表示（PDF） - Zetex => Diodes

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ZXCT1010E5

ENHANCED HIGH-SIDE CURRENT MONITOR

Zetex => Diodes 

ZXCT1010

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 ohms.

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

TYPICAL CIRCUIT APPLICATION

Vin Rsense

V in

Load

ZXCT1010

GND

I out

Vout

Rout

Rload

Where Rload represents any load including DC motors,

a charging battery or further circuitry that requires

monitoring, Rsense can be selected on specific

requirements of accuracy, size and power rating.

ISSUE 6 - AUGUST 2003

5

SEMICONDUCTORS

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