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| ICP-S Technical Manual Overcurrent Protection Elements ICP-S Technical Manual ICP-S 1. Overview The ICP-S is an IC protector of surface mounting type developed as an element for the protection of ICs from output short-circuiting damage. The internal resistance of this lightweight, compact overcurrent protection element is low, as long as the steady-state current of the element does not exceed the rated DC or AC current. The ICP-S, however, turns off ICs instantly if the steady-state current reaches or exceeds the breaking current of the ICP-S. 2. External Dimensions (Unit: mm) 3.00.1 1.5 +0.1 -0 4.00.1 4.00.1 2.00.05 3.50.05 1.750.1 0.40.1 3.20.2 2.00.1 1.550.1 3.50.2 5.30.2 1.150.1 2.50.1 0~0.5 8.00.2 0~0.1 0.6 1.0 1.80.1 TN direction 2.80.2 2.30.2 (Mark: TN) 3. Features 1) Instantly breaks currents with a low potential drop. (See 3-1 Potential Drop Comparison) 2) Compact surface-mounting model. (See 2. External Dimensions) 3) Unlike fuses, there is no steady-state current reduction with the rated current applied. No derating is necessary. 4) Minimal breaking point dispersion. (See the graph in 3-2 Breaking Current Dispersion Characteristics) 5) Excellent temperature characteristics (See the graphs in 3-3 Temperature Characteristics) * The fluctuation of the breaking current caused by temperature changes is minimal. * Wide operating temperature range: -55C to +125C 6) Excellent vibration resistance. 7) UL-approved product with certification No. 107856. 8) No deterioration or circuit breaking caused by static electricity. Rev.A 1/13 ICP-S Technical Manual Overcurrent Protection Elements 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 DC 500mV / div NORMAL 10mSEC / div Rev.A 2/13 ICP-S Technical Manual Overcurrent Protection Elements 3-2 Breaking Current Dispersion Characteristics 1000 100 Breaking time (mec)c 10 max typ 1 min n=5pcsx5lot 0.1 0.01 01234 5678 9 10 11 12 13 14 15 16 17 18 19 20 Breaking Current (A) Breaking Time (Reference) Effective Value and Dispersion Data (ICP-S1.0) 3-3 Temperature Characteristics 1.2 3.0 1.1 2.5 Breaking current ratio 1.0 Current applied (A) 2.0 0.9 1.5 1.2 1.0 0.7 S1.2 S1.0 S0.7 S0.5 0.8 0.7 0.5 0 -50 -25 0 25 50 75 100 125 0 0 25 50 75 100 125 150 175 Ambient temperature Ta (C) Breaking Current vs. Ambient Temperature Characteristics (ICP-S) Ambient temperature Ta (C) Rated Current Derating Curve (ICP-S) Rev.A 3/13 ICP-S Technical Manual Overcurrent Protection Elements 4. Selection Flowchart Type of steady-state current? DC Pulse Surge current Inrush current included included Check with the I2t characteristics graph. Does the steady-state current not exceed the rated current of the ICP? Yes No Change the ICP model to satisfy the condition. Is the rated voltage (i.e., the open-circuit voltage when the ICP breaks the current) 50 V or below? No Yes Lower the open-circuit voltage. Is the breaking current (the maximum abnormal current) within a range of 2x to 10x of the ICP's rated current? Yes Change the ICP model to satisfy the condition. No The selection is OK. List of ICP-S Models TYPE Rated current (A) 0.5 ICP-S0.5 0.7 ICP-S0.7 1.0 ICP-S1.0 1.2 ICP-S1.2 Breaking current (A) 1.0 to 5.0 1.4 to 7.0 2.0 to 10.0 2.4 to 12.0 The I2t-t characteristic graph (i.e., the Joule integral sheet) provides necessary data used to check how the life of the ICP-S is influenced by heat cycling or mechanical fatigue caused by repetitive current pulses. Rev.A 4/13 ICP-S Technical Manual Overcurrent Protection Elements 5. Checks with I2t-tCharacteristic Graph If the steady-state current includes a pulse, surge, or inrush-current, use the I2t 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. I2t-t Graph I2t-t Graph Breaking current area I2 t (A2 - ms) Deterioration area Safety area Margin area t (s) 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 * 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 I2t 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. Rev.A 5/13 ICP-S Technical Manual Overcurrent Protection Elements 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 Im2t 3 2) Rectangular wave form 0 t Im I2t = Im2t 3) Irregular wave form I2 0 t I1 I2t = I1I2t + 1 (I1 - I2)2t 3 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. 1 2 3 4 5 Rev.A 6/13 ICP-S Technical Manual Overcurrent Protection Elements 7. ICP-S Test Example 7-1 Example 1 Current mode: DC Model: ICP-S1.0 Wave form: DC 1A 2A 5A Test: The current values of all segmented periods are plotted respectively as shown in attached graph 1. 1 A: The steady-state current is in the safety area where the ICP-S will not deteriorate or break the current. 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 0.7 ms. 7-2 Example 2 Current mode: A single pulse Model: ICP-S1.0 Wave form: A current of 1.75 A flows for a period of 20 ms. 1.75A 20ms Results: The steady-state current is in the critical area. If the single pulse is repeated intermittently, the ICP-S will deteriorate or break the current in the end. Test: With pulse current: I2t = 1.752x20 = 61 (A2 * ms) at 20ms (See graph 2) Rev.A 7/13 ICP-S Technical Manual Overcurrent Protection Elements 10000 Graph 1 Ta=25C 1000 I2 t (A2 - ms) 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 5A DC DC 0.01 0.001 0.01 DC 1A 0.1 2A 0.1 1 10 100 1000 10000 100000 Time (msec) I2 t-t Characteristic Curve (ICP-S1.0) 10000 Graph 2 Ta=25C 1000 I2 t (A2 - ms) 100 61 (A2 ms) at 20ms 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 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) Rev.A 8/13 ICP-S Technical Manual Overcurrent Protection Elements 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 x 32A x 1ms = 3 (A2 * ms) Plotting test: 10000 Graph 2 Ta=25C 1000 I2 t (A2 - ms) 100 A :Effective pulse breaking line (with no margin) 10 B: Effective pulse critical line (with no margin) 3 (A2 ms) at 1ms C: Effective pulse recommended critical line (with margin) 1 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 ICP-S Technical Manual Overcurrent Protection Elements Joule Integral Calculation of Irregularly Increasing or Decreasing Current Current mode: Irregular wave form + triangular wave form Model: ICP-S1.2 10A Wave form: Actual wave form 8A 6A Approximation curve for Joule integral calculation 3.5A 2A Wave form approximation: The above wave form (electric charge wave form) is approximated as an irregular wave form to calculate the Joule integral of the wave form. Test: Accumu- Lapsed Peak Segmented Item current period Joule integral lation time Formula Im t No. Coefficient x Im2 x t A2 * ms) (A) (ms) (A2 * ms) (ms) 2x0.06= 1 10 0.06 10x8x0.06+1/3x(10-8) 4.88 0.06 4.88 0.1 8x6x0.1+1/3x(8-6)2x0.1= 4.93 0.16 9.81 8 2 8.07 0.51 17.88 6 3 0.35 6x3.5x0.35+1/3x(6-3.5)2x0.35= 1.93 0.76 19.81 3.5 4 0.25 3.5x2x0.25+1/3x(3.5-2)2x0.25= 0.73 1.31 20.54 2 5 0.55 1/3x(2)2x0.55= Plotting test: 100000 I2 t (A2 - ms) Test results: The steady-state current is between lines B and A. Therefore, it is considered that the ICP-S will deteriorate or break the current due to the repetitive pulses. 0.06ms 0.1ms 0.35ms 0.25ms 0.55ms Ta=25C 10000 A : Effective pulse breaking line (with no margin) 1000 4 3 5 100 2 1 B : Effective pulse critical line (with no margin) 10 1 C : Effective pulse recommended line (with margin) 0.1 0.001 0.01 0.1 1 10 100 1000 10000 100000 Time (msec) I2 t-t Characteristic Curve (ICP-S1.2) Rev.A 10/13 ICP-S Technical Manual Overcurrent Protection Elements 8. Application Circuit Example 8-1 Recommended Flow Soldering Conditions (C) 300 Preheating Soldering Natural cooling 260C 250 Solder temperature 230C 200 Manual soldering conditions 150 120C 100 100C Soldering iron temperature: 350C max. Soldering time: 3 seconds max. 50 25 2 minutes min. 5 minutes min. 10 seconds min. 1 minute min. 8-2 Recommended Reflow Soldering Conditions Peak temperature 230 to 260C, 10sec Max. (C) 250 Reflow heating temperature 200 1 to 5C / sec Temperature 150 100 Preheating 120 to 160C, 50 to 120 sec Preheating speed 1 to 5C / sec Number of reflow times: 2 TIMES Max. 50 Reflow soldering (High-temperature retention time) 200C, 30 to 60 sec Cooling 60sec Min. 0 A peak temperature of at least 230C is recommended. If the peak temperature is less than 230C, it is recommended to make some adjustments, such as the retention of the peak temperature and soldering time longer and an increase in the thickness of solder paste. 8-3 Recommended Copper Pattern on PCB 1.8 to 2.4 1.6 to 2.0 4.0 to 5.0 Rev.A 11/13 ICP-S Technical Manual Overcurrent Protection Elements 9. Application Circuit Examples 9-1 Power Supply Circuit ICP 9-2 DC-DC Converter ICP ICP 9-3 Motor Control VCC ICP M Rev.A 12/13 ICP-S Technical Manual Overcurrent Protection Elements 10. Precautions 1. Set the breaking current two to ten times as high as the rated current. Use the ICP-S so that the open-circuit voltage between the terminals after the ICP-S breaks the current will be a maximum of 50 V. Unless the ICP-S is used under these conditions, the mold may be damaged or internal resistance may remain after the ICP-S breaks the current. 2. Do not use the ICP-S for the primary side of commercial power supply, or otherwise the mold may be damaged by arcing after the ICP-S breaks the current. 10000 Ta=25C 10000 Ta=25C 1000 1000 I2 t (A2 - ms) 10 A :Effective pulse breaking line (with no margin) I2 t (A2 - ms) 100 100 10 A :Effective pulse breaking line (with no margin) B: Effective pulse critical line (with no margin) 1 B: Effective pulse critical line (with no margin) 1 C: Effective pulse recommended critical line (with margin) 0.1 C: Effective pulse recommended critical line (with margin) 0.1 0.01 0.001 0.01 0.1 1 10 100 1000 10000 100000 0.01 0.001 0.01 0.1 1 10 100 1000 10000 100000 Time (msec) I2 t-t Characteristic Curve (ICP-S0.5) Time (msec) I2 t-t Characteristic Curve (ICP-S0.7) 10000 Ta=25C 10000 Ta=25C 1000 1000 I2 t (A2 - ms) I2 t (A2 - ms) 100 100 A :Effective pulse breaking line (with no margin) A :Effective pulse breaking line (with no margin) 10 B: Effective pulse critical line (with no margin) 10 B: Effective pulse critical line (with no margin) 1 C: Effective pulse recommended critical line (with margin) 1 C: Effective pulse recommended critical line (with margin) 0.1 0.1 0.01 0.001 0.01 0.1 1 10 100 1000 10000 100000 0.01 0.001 0.01 0.1 1 10 100 1000 10000 100000 Time (msec) I2 t-t Characteristic Curve (ICP-S1.0) Time (msec) I2 t-t Characteristic Curve (ICP-S1.2) Rev.A 13/13 Appendix Notes No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention 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 are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document are no antiradiation design. The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of with would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. About Export Control Order in Japan Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control Order in Japan. In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause) on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction. Appendix1-Rev1.1 |
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