ZXCT1081E5TA Diodes Zetex, ZXCT1081E5TA Datasheet - Page 8

• Manufacturer Part Number: ZXCT1081E5TA
• Description: IC CURRENT MONITOR 3% SOT23-5
• Manufacturer: Diodes Zetex

Specifications of ZXCT1081E5TA

• Function: Current Monitor
• Sensing Method: High-Side
• Accuracy: ±3%
• Voltage - Input: 3 ~ 40 V
• Current - Output: 1mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Operating Temperature (max): 125C
• Operating Temperature (min): -40C
• Pin Count: 5
• Mounting: Surface Mount
• Package Type: SOT-23
• Case Length: 3.1(Max)mm
• Screening Level: Automotive
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ZXCT1081E5TR

A Product Line of
Diodes Incorporated
ZXCT1081
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.
Input
Load
R
SENSE +
SENSE
SENSE -
ZXCT1081
R
SH
V
CC
A1
M1
OUT
A2
+1
R
G
GND
Figure 1 Typical Configuration of ZXCT1081
Load current from the input is drawn through R
developing a voltage V
across the inputs of the ZXCT1081.
SENSE
SENSE
The internal amplifier forces V
across internal resistance R
causing a current to flow through MOSFET M1. This
SENSE
SH
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
G
G
SH
then buffered by the unity gain buffer.
The gain equation of the ZXCT1081 is:
R
V
= I
R
G
x 1 = x R
x 10
OUT
L
SENSE
SENSE
R
SH
The maximum recommended differential input voltage, V
, is 150mV; it will however withstand voltages up to 800mΩ.
SENSE
This can be increased further by the inclusion of a resistor, R
, between SENSE- pin and the load; typical value is of the
LIM
order of 10k .
8 of 11
ZXCT1081
March 2010
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© Diodes Incorporated
Document number: DS32102 Rev. 1 - 2