ZXCT1109 datasheet(11/17 Pages) DIODES

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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

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

IOUTERROR = +/- { 3.28*10

-6 + V

SENSE * 0.000072 } A

The percentage error is

100

004

100

SENSE

OUTERROR

OUTIDEAL

OUTERROR

Then

004

0072

SENSE

−

082

SENSE

Equation 2

This shows that the error is reduced with increasing VSENSE. Then the minimum VSENSE required to give the error ±ε % is

082

SENSE

−

[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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