zxct1107 Diodes, Inc., zxct1107 Datasheet - Page 11

• Manufacturer Part Number: zxct1107
• Description: Low Power High-side Current Monitors
• Manufacturer: Diodes, Inc.

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