ICP-S データシートの表示（PDF） - ROHM Semiconductor

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ICP-S

Overcurrent Protection Elements

ROHM Semiconductor 

Overcurrent Protection Elements

ICP-S Technical Manual

6. I2t Calculation of a Variety of Wave forms

If the steady-state current includes a pulse, surge, or inrush current, calculate the I2t of

the wave form of the current. The following graphs and formulas show how to calculate

a variety of wave forms.

1) Triangular

wave form

Im

0

t

I2t =

1

3

Im2t

2) Rectangular

wave form

0

3) Irregular

wave form

0

Im

t

I2t = Im2t

I1

I2

t

I2t = I1I2t +

1

3

(I1 − I2)2t

4) Charged or

discharged

wave form

• The charged wave form is segmented as shown below. The Joule heat

generated during each segmented period is plotted onto a Joule integral

sheet.

Segments 1 through 4 are treated as

irregular wave forms and calculated,

while segment 5 is treated as a

triangular wave form and calculated.

12

3

4

5

Rev.A

6/13

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