AUIPS7141R

Current sensing accuracy

Ifb

Iout

Ifb leakage

Ifb2

Ifb1

Iout2

Iout1

I offset

)/( Ifb2 – Ifb1)

Iout1

the system will depends on the variation of

the I offset and the ratio over the temperature range. The

Ratio_TC specified in page 4.

on the Rdson :

set@25°C / 1.9

Maximum Vcc voltage with short circuit protection

rt circuit is the maximum voltage for which the part is able to protect itself under test

of short circuits are considered : terminal and load short circuit.

L SC

R SC

The current sensing is specified by measuring 3 points :

- Ifb1 for Iout1

- Ifb2 for Iout2

- Ifb leakage for Iout=0

The parameters in the datasheet are computed with the following formula :

Ratio = ( Iout2 – Iout1

I offset = Ifb1 x Ratio –

This allows the designer to evaluate the Ifb for any Iout value using :

Ifb = ( Iout + I offset ) / Ratio if Ifb > Ifb leakage

For some applications, a calibration is required. In that case, the accuracy of

ratio variation is given by

The Ioffset variation depends directly

I offset@-40°C= I offset@25°C / 0.8

I offset@150°C= I off

The maximum Vcc voltage with sho

conditions representative of the application. 2 kind

Terminal SC

0.1 µH

10 mohm

Load SC

10 µH

100 mohm

Out

IPS

Vcc

L SC

L s

5µ

upply

H

R supply

10mohm

R SC

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