ZXCT1081E5TA【PDF 8/11 页】IC CURRENT MONITOR 3% SOT23-5

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ZXCT1081

Document number: DS32102 Rev. 1 - 2

8 of 11

www.diodes.com

March 2010

?Diodes Incorporated

Product Line of

Diodes Incorporated

Application Information

The ZXCT1081 has been designed to allow it to operate with 5V supply rails while sensing common mode signals up to

40V. This makes it well suited to a wide range of industrial and power supply monitoring applications that require the

interface to 5V systems while sensing much higher voltages.

To allow this its VCC pin can be used independently of SENSE+.

Figure 1 shows the basic configuration of the ZXCT1081.

ZXCT1081

OUT

GND

SENSE

Input

Load

SENSE

Figure 1 Typical Configuration of ZXCT1081

Load current from the input is drawn through R

SENSE

developing a voltage V

SENSE

across the inputs of the ZXCT1081.

The internal amplifier forces V

SENSE

across internal resistance R

causing a current to flow through MOSFET M1. This

current is then converted to a voltage by R

. A ratio of 10:1 between R

and R

creates the fixed gain of 10. The output is

then buffered by the unity gain buffer.

The gain equation of the ZXCT1081 is:

OUT

= I

SENSE

x 1 = x R

SENSE

x 10

The maximum recommended differential input voltage, V

SENSE

, is 150mV; it will however withstand voltages up to 800m&.

This can be increased further by the inclusion of a resistor, R

LIM

, between SENSE- pin and the load; typical value is of the

order of 10k .

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