AUIPS7142G 데이터 시트보기 (PDF) - International Rectifier

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AUIPS7142G

DUAL CHANNELS CURRENT SENSE HIGH SIDE SWITCH

International Rectifier 

AUIPS7142G

Over-current protection

The threshold of the over-current protection is set in order to guaranteed that the device is able to turn on a load with an

inrush current lower than the minimum of Isd. Nevertheless for high current and high temperature the device may switch

off for a lower current due to the over-temperature protection. This behavior is shown in Figure 11.

Current sensing accuracy

Ifb

Ifb2

Ifb1

Ifb leakage

I offset

Iout1

Iout2

Iout

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 )/( Ifb2 – Ifb1)

I offset = Ifb1 x Ratio – Iout1

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 the system will depends on the variation of

the I offset and the ratio over the temperature range. The ratio variation is given by Ratio_TC specified in page 4.

The Ioffset variation depends directly on the Rdson :

I offset@-40°C= I offset@25°C / 0.8

I offset@150°C= I offset@25°C / 1.9

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