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ICP-S Technical Manual 

 

Overcurrent Protection Elements

  

Rev.A 

5/13 

 

5. Checks with I

2

t-tCharacteristic Graph

If the steady-state current includes a pulse, surge, or inrush-current, use the I

2

graph and check that the ICP will not deteriorate regardless of the mode of the 
current or the ICP will not break the steady-state current while the ICP is in operation.

• Even though the Joule integral value of the current wave form designed at your end is 
within the safety area, it is recommended that you confirm the steady-state current for 
the safety of the components

Refer to the next section, calculate the I

2

t value, and check the position of the I2t value 

in the graph. If the value is in the safety area, it is okay to use the selected ICP model. 
If the value is, however, beyond the safety area, use an ICP model with higher ratings.

• Note: The inspection and selection of the ICP according to the Joule integral value is 
absolutely based on the results of the approximation of the current wave form.
Be sure to inspect all the current wave forms of your application, or otherwise the safety 
of the application will not be fully ensured.
• Consider a safety margin with the dispersion of component characteristics taken into 
calculation when inspecting and selecting the ICP, if it is impossible to check the worst 
current wave form.

I

2

t-t Graph

Breaking current area: The ICP breaks the current in this area.

Deterioration area: Although the ICP does not break the current instantaneously, 
the ICP may break the current as a result of ICP deterioration.

Marginal area: The area where the risk of ICP deterioration is low. 
Basically avoid using this area.

Safety area: The ICP will not deteriorate or break the current.

Precautions

t  (s)

I

t (A

2

 - ms)

Breaking 

current area

Safety area

Deterioration 

area

Margin area

I

2

t-t Graph

 

Summary of Contents for ICP-S

Page 1: ...2 0 0 05 1 75 0 1 4 0 0 1 0 4 0 1 0 0 1 1 8 0 1 0 6 1 0 3 2 0 2 2 0 0 1 1 55 0 1 2 5 0 1 3 0 0 1 0 1 0 1 5 TN direction 3 Features 1 Instantly breaks currents with a low potential drop See 3 1 Potenti...

Page 2: ...ent Protection Elements Rev A 2 13 3 1 Potential Drop Comparison ICP S VS Fuse ICP S1 0 Rated Current 1 A 2 0A 1 8A 1 5A 1 0A DC 500mV div NORMAL 10mSEC div Fuse Rated Current 1 A 4 0A 3 0A 2 0A 1 0A...

Page 3: ...ata ICP S1 0 n 5pcs 5lot typ max min 50 0 0 7 0 8 0 9 1 0 1 1 1 2 Ambient temperature Ta C Breaking current ratio 25 0 25 50 75 100 125 Breaking Current vs Ambient Temperature Characteristics ICP S 0...

Page 4: ...rrent of the ICP Is the rated voltage i e the open circuit voltage when the ICP breaks the current 50 V or below Is the breaking current the maximum abnormal current within a range of 2x to 10x of the...

Page 5: ...del with higher ratings Note The inspection and selection of the ICP according to the Joule integral value is absolutely based on the results of the approximation of the current wave form Be sure to i...

Page 6: ...ariety of wave forms The charged wave form is segmented as shown below The Joule heat generated during each segmented period is plotted onto a Joule integral sheet 1 Triangular wave form 0 t Im I2 t I...

Page 7: ...t 2 A The ICP S will break the steady state current in the breaking current area in approximately 100 ms 5 A The ICP S will break the steady state current in the breaking current area in approximately...

Page 8: ...no margin C Effective pulse recommended critical line with margin 0 001 0 01 0 1 1 10 100 1000 10000 0 01 Time msec I 2 t A 2 ms 0 1 1 10 100 1000 10000 100000 I2 t t Characteristic Curve ICP S1 0 Gra...

Page 9: ...necting the peak of each current wave form Test Obtain the approximated value by substituting the values into the formula triangular wave form I2 t 1 3 Im2 t I2 t 1 3 32 A 1ms 3 A2 ms Plotting test Te...

Page 10: ...l wave form Approximation curve for Joule integral calculation 10A 8A 6A 2A 3 5A 0 1ms 0 35ms 0 25ms 0 55ms 0 06ms Item Peak current Im A t ms ms A2 ms Formula Coefficient Im2 t A2 ms No 1 10 0 06 0 0...

Page 11: ...0 seconds min 230 C 260 C 150 200 250 300 0 50 100 C Preheating speed A peak temperature of at least 230 C is recommended If the peak temperature is less than 230 C it is recommended to make some adju...

Page 12: ...ICP S Technical Manual Overcurrent Protection Elements Rev A 12 13 9 Application Circuit Examples 9 1 Power Supply Circuit 9 2 DC DC Converter 9 3 Motor Control ICP ICP ICP M ICP VCC...

Page 13: ...Effective pulse critical line with no margin C Effective pulse recommended critical line with margin 0 001 0 01 0 1 1 10 100 1000 10000 0 01 Time msec I 2 t A 2 ms 0 1 1 10 100 1000 10000 100000 I2 t...

Page 14: ...tion to the peripheral conditions when designing circuits and deciding upon circuit constants in the set Any data including but not limited to application circuit diagrams information described herein...

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