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

Joule Integral Calculation of Irregularly Increasing or Decreasing Current

Current mode: Irregular triangular wave form

Model: ICP-S1.0

Wave form:

3A

Approximation curve for

Joule integral calculation

Actual wave form

1ms

Wave form approximation: The above wave form is approximated by electrically calculating the Joule

integral of each segment of the current wave form. In consideration of the heat

cycling and mechanical fatigue of the ICP-S, however, a practical Joule

integral value is calculated from an approximation curve obtained by

connecting the peak of each current wave form.

Test: Obtain the approximated value by substituting the values into the formula

(triangular wave form I2t = 1/3 • Im2 • t).

I2t = 1/3 × 32A × 1ms = 3 (A2 • ms)

Plotting test:

10000

1000

Graph 2

Ta=25°C

100

A :Effective pulse breaking

line (with no margin)

10

B: Effective pulse critical line

(with no margin)

C: Effective pulse recommended

critical line (with margin)

1

3 (A2 ms) at 1ms

0.1

0.01

0.001

0.01 0.1

1

10 100 1000 10000 100000

Time (msec)

I2 t-t Characteristic Curve (ICP-S1.0)

Test results: The steady-state current does not exceed line C. Therefore, it is considered that the ICP-S

will not deteriorate or break the current.

Rev.A

9/13

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