ICP-S ROHM Electronics, ICP-S Datasheet - Page 9

• Manufacturer Part Number: ICP-S
• Description: Overcurrent Protection Elements
• Manufacturer: ROHM Electronics

Overcurrent Protection Elements
Joule Integral Calculation of Irregularly Increasing or Decreasing Current
Current mode: Irregular triangular wave form
Model: ICP-S1.0
Wave form:
Wave form approximation: The above wave form is approximated by electrically calculating the Joule
Test: Obtain the approximated value by substituting the values into the formula
Plotting test:
Test results: The steady-state current does not exceed line C. Therefore, it is considered that the ICP-S
(triangular wave form I
I
2
t = 1/3 × 3
will not deteriorate or break the current.
Actual wave form
2
A × 1ms = 3 (A
C: Effective pulse recommended
10000
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.
1000
0.01
2
100
critical line (with margin)
0.1
0.001
10
t = 1/3
1
B: Effective pulse critical line
A :Effective pulse breaking
Ta=25°C
Graph 2
line (with no margin)
2
(with no margin)
•
0.01
ms)
•
Im
I
2
t-t
2
1ms
0.1
Characteristic Curve (ICP-S1.0)
•
t).
1
Time (msec)
3 (A
2
10
ms) at 1ms
100
3A
1000
Approximation curve for
Joule integral calculation
10000
ICP-S Technical Manual
100000
Rev.A
9/13