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BA33JC5WT Folha de dados(PDF) 6 Page - Rohm |
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BA33JC5WT Folha de dados(HTML) 6 Page - Rohm |
6 / 11 page BA□□JC5 Series,BA00JC5WT Technical Note 6/10 www.rohm.com 2011.02 - Rev.B © 2011 ROHM Co., Ltd. All rights reserved. Thermal Derating Curve TO220FP-3/TO220FP-5/TO220FP-5 (V5) Fig.17 The characteristics of the IC are greatly influenced by the operating temperature. If the temperature exceeds the maximum junction temperature Tjmax, deterioration or damage may occur. Implement proper thermal designs to ensure that power dissipation is within the permissible range in order to prevent instantaneous damage resulting from heat and maintain the reliability of the IC for long-term operation. The following method is used to calculate the power consumption Pc (W): Pc = (Vcc – Vo) Io + Vcc Icca Power dissipation Pd ≥ Pc The load current Io is calculated: Calculation Example: Vcc = 6.0V and Vo = 5.0V at Ta = 85℃ Refer to the above and implement proper thermal designs so that the IC will not be used under excessive power dissipation conditions under the entire operating temperature range. The power consumption Pc of the IC in the event of shorting (i.e. the Vo and GND pins are shorted) can be obtained from the following equation: Pc = Vcc (Icca + Ishort) (Ishort: short current) 0 15 25 20 10 5 25 50 75 125 150 100 0 AMBIENT TEMPERATURE:Ta [°C] (1)20.0 (2)2.0 (2) During IC without heat sink operation. j-a = 62.5 (°C/W) (1) When using an infinite heat sink. j-c = 6.25 (°C/W) ja = 62.5°C/W −16.0mW/°C 25°C = 2000mW 85°C = 1040mW Vcc : Input voltage Vo : Output current IO : Load current Icca : Circuit current Io ≤ Pd − Vcc Icca Vcc − Vo 1.040 − 6.0 Icca 6.0 − 5.0 Io ≤ 860mA (Icca 30mA) |
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Descrição semelhante - BA33JC5WT |
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