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53248 Datasheet(PDF) 5 Page - Micropac Industries |
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53248 Datasheet(HTML) 5 Page - Micropac Industries |
5 / 7 page Micropac Industries cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement. Micropac reserves the right to make changes at any time in order to improve design and to supply the best product possible. MICROPAC INDUSTRIES, INC. HYBRID MICROELECTRONICS PRODUCTS DIVISION • 905 E. Walnut St., Garland, TX 75040 • (972) 272-3571 • Fax (972) 494-2281 www.micropac.com E-MAIL: hybridsales@micropac.com 05/16/01 PRELIMINARY DATA SHEET 53248 28 VDC SOLID STATE HIGH SIDE SELF-PROTECTED POWER CONTROLLER APPLICATION INFORMATION The cable harness occupies an important position in the total network to be protected. The wide variety and in some cases considerable length and packing density used makes them particularly susceptible to persistent overloads and overheating. The maximum current carrying capacity of a cable depends on its resistance, type of insulation material and the ambient temperature. A cable, including insulation, generally consists of at least two materials with different thermal capacitance and thermal resistance. The maximum temperatures of most cables are at least +150°C (depending on the insulation properties) which is very close to the maximum junction temperature of the SSPC (Shutdown). Since under overcurrent or short circuit conditions, the unit resistance per unit length for the cable is much less than the RDS of the SSPC, the unit heating will also be much less. Under these conditions, it is apparent that the SSPC can adequately protect properly selected cabling. The following formulas provide methods for calculating the primary parameters. Trip Current Itrip = {(Tj max – Ta)/[R θja ][RON (Tj max)]} 1/2 Tj max = Maximum Trip Temperature R θja = Thermal Resistance, Junction to Ambient Ta = Ambient Temperature RON (Tj max) = On-state resistance at Trip Temperature On-state Resistance RON(T) = {(Y2 – Y1)T2 + (300)(Y2 – Y1)T + (67500)Y1 – (8125)Y2} / 59375 Y1 = RON at +25°C Y2 = RON at +150°C T = Tj at temperature of interest in °C With the above information, the temperature and current trip can be determined based upon the type of mounting chosen and the ambient temperatures of operation. Precaution When a short circuit causes turn-off of the SSPC, precautions must be taken to limit transient voltages generated by any inductance in the load. External protection is recommended, either across the switch or across the load, should the application result in energies beyond this level. |
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