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ZXCT1107 Datasheet(PDF) 11 Page - Diodes Incorporated

Part No. ZXCT1107
Description  LOW POWER HIGH-SIDE CURRENT MONITORS
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Maker  DIODES [Diodes Incorporated]
Homepage  http://www.diodes.com
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ZXCT1107 Datasheet(HTML) 11 Page - Diodes Incorporated

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ZXCT1107/1109/1110
LOW POWER HIGH-SIDE CURRENT MONITORS
ZXCT1107/1109/1110
Document number: DS35033 Rev. 1 - 2
11 of 17
www.diodes.com
MARCH 2011
© Diodes Incorporated
A Product Line of
Diodes Incorporated
Application Information (cont.)
The ZXCT1110 is highly linear and has a transconductance of 4mA/V ±1.8% and an output of 40µA ±4µA at VSENSE=10mV.
The output current can therefore be calculated (Standard International Units) as:
IOUT = (40 +/-4)*10
-6 + (V
SENSE-0.01)*(0.004 +/- 0.000072) Amp
The worst-case current error is then
IOUTERROR = IOUT – IOUTIDEAL = +/- { 4*10
-6 + (V
SENSE-0.01) * 0.000072 }
Amp
or
IOUTERROR = +/- { 3.28*10
-6 + V
SENSE * 0.000072 } A
The percentage error is
%
100
*
004
.
0
*
V
I
%
100
*
I
I
SENSE
OUTERROR
OUTIDEAL
OUTERROR
=
=
ε
Then
004
.
0
*
V
0072
.
0
*
V
10
*
28
.
3
SENSE
SENSE
4
+
±
=
ε
%
or
%
8
.
1
V
082
.
0
SENSE
±
±
=
ε
Equation 2
This shows that the error is reduced with increasing VSENSE. Then the minimum VSENSE required to give the error ±ε % is
8
.
1
082
.
0
V
SENSE
ε
=
V
[only for ZXCT1110]
Equation 3
In the application, the effect of the external resistor tolerances must also be taken into account.
Table 1: ZXCT1107/ZXCT1109 Error
VSENSE
Mean IOUT
Error Band
Percent Error
10mV
45.5 µA
±8.5µA
±18.7%
30mV
124.5 µA
±7.6µA
±7.6%
100mV
408 µA
±3.4µA
±3.4%
200mV
809.8 µA
±22.5µA
±2.8%
Table 2: ZXCT1110 Error
VSENSE
Mean IOUT
Error Band
Percent Error
10mV
40µA
±4µA
±10%
30mV
120µA
±5.44µA
±4.53%
100mV
400µA
±10.48µA
±2.62%
200mV
800µA
±17.68µA
±2.21%


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