ZXCT1011 datasheet(7/8 Pages) ZETEX

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ZXCT1011

Issue 1- July 2005

www.zetex.com

Application information (cont.)

Minimum operating voltage

The minimum operating voltage of the ZXCT1011 is 2.5V and is defined as the difference between

Vsense+ and the Iout pin. It must be ensured that sufficient headroom is given for the operation of

the device when considering Rout.

Figure 2

Considerations for supply rail

Voltage across device 2.5V

Vin - Vout 2.5V

Where Vout = Iout x Rout

At low supply voltages and high Vsense measurements, special care must be taken to ensure the

correct operation.

The circuit in figure 2.0 shows a ZXCT1011 operating from 10V supply rail.

The minimum

operating voltage of the ZXCT1011 is 2.5V. This allows a maximum output voltage of 7.5V to be

set at Vout. A 3k resistor on the output would draw a maximum 2.5mA from Iout. - See minimum

usable supply voltage graph on page 4.

Vsense+

ZXCT

1011

sense-

Vin

R sense

load

I out

3.3K

Vout

Rshunt

120R

= 10V

ZXCT1011 Datasheet(PDF) 7 Page - Zetex Semiconductors