ZXCT1008_07 datasheet(6/8 Pages) ZETEX

Part #	ZXCT1008

Description	AUTOMOTIVE HIGH-SIDE CURRENT MONITOR

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Manufacturer	ZETEX [Zetex Semiconductors]

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

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6 / 8 page

ZXCT1008

ISSUE 3 - FEBRUARY 2007

6

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.

An additional resistor, Rlim can be added in series

with Rout (figure 1.0), to limit the current from Iout.

Any circuit connected to Vout will be protected from

input voltage transients. This can be of particular

use in automotive applications where load dump

and o ther common t ransients n eed to be

considered. The zener Z1 provides additional

protection for local dump, reverse battery and high

voltage transient incidents.

Assuming the worst case condition of Vout = 0V;

providing a low impedance to a transient, the

minimum value of Rlim is given by:-

R(min)

VV

I

lim

pk

max

pk

=

−

Vpk = Peak transient voltage to be withstood

Vmax = Maximum working Voltage = 20V

Ipk = Peak output current = 40mA

The maximum value of Rlim is set by Vin(min),

Vout(max) and the dropout voltage (see transfer

characteristic on page 3) of the ZXCT1009 :-

R

[V

V

(max)

V

lim

out

in

dp

out

(max)

(min)

(

)]

(max)

=

−+

Vin(min) = Minimum Supply Operating Voltage

Vdp = Dropout Voltage

Vout (max) = Maximum Operating Output Voltage

Figure 1.0

ZXCT1009 with additional current limiting Resistor Rlim

and zener Z1

TYPICAL AUTOMOTIVE CIRCUIT APPLICATION

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ZXCT1008 Datasheet(PDF) 6 Page - Zetex Semiconductors

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