ZXCT1010 데이터 시트보기 (PDF) - Zetex => Diodes

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ZXCT1010

Enhanced high-side current monitor

Zetex => Diodes 

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

ZXCT1010

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 ROUT(1)

For example:

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⍀.

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⍀

Schematic diagram

SENSE+

SENSE-

100⍀

+-

GND

OUT

Issue 9 - July 2006

5

© Zetex Semiconductors plc 2006

www.zetex.com

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