ZXCT1081E5TA Diodes Zetex, ZXCT1081E5TA Datasheet - Page 9

• 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

Capacitor CD provides high frequency transient decoupling when used with R
For best performance R
resistance with R
When choosing appropriate values for R
potential power dissipation effects) and small signal accuracy.
Higher values for R
best operation the ZXCT1081 has been designed to operate with V
Current monitors' basic configuration is that of a unipolar voltage to current to voltage converter powered from a single
supply rail. The internal amplifier at the heart of the current monitor may well have a bipolar offset voltage but the output
cannot go negative; this results in current monitors saturating at very low sense voltages.
As a result of this phenomenon the ZXCT1081 has been specified to operate in a linear manner over a V
10mV to 150mV range, however it will still be monotonic down to V
It is for this very reason that Zetex has specified an input offset voltage (V
voltage from 10mV to 150mV can be calculated as follows:
V
Alternatively the load current can be expressed as:
ZXCT1081
Document number: DS32102 Rev. 1 - 2
I
OUT
L
=
= (V
SENSE
V
OUT
GxR
) xG + V
SENSE
– V
SENSE
SENSE
O(10)
.
O(10)
SENS
gives better accuracy at low load currents by reducing the inaccuracies due to internal offsets. For
E should be connected as close to the SENSE+ (and SENSE ) pins; minimizing any series
Figure 2 Protection/Error Sources for ZXCT1081
SENSE
SENSE +
a compromise must be reached between in-line signal loss (including
ZXCT1081
www.diodes.com
R
SENSE
9 of 11
C
D
SENSE
SENSE
SENSE -
of 0V.
of the order of 50mV to 150mV.
O(10)
LIM
) at 10mV. The output voltage for any V
R
; typical values are of the order 10pF.
LIM
Diodes Incorporated
A Product Line of
SENSE
© Diodes Incorporated
ZXCT1081
March 2010
range of
SENSE