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BD42530EFJ-C Datasheet(PDF) 16 Page - Rohm |
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BD42530EFJ-C Datasheet(HTML) 16 Page - Rohm |
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16 / 29 page  Datasheet Datasheet 16/25 BD42530xxx-C Series © 2016 ROHM Co., Ltd. All rights reserved. TSZ22111 • 15 • 001 www.rohm.com TSZ02201-0G7G0AN00550-1-2 20.Apr.2016 Rev.001 Thermal Design Within this product, the power consumption is decided by the dropout voltage condition, the load current and the circuit current. Refer to Package Data illustrated in Figure 20, 21 when using the IC in an environment of Ta ≥ 25 °C. Even if the ambient temperature Ta is at 25 °C, depending on the input voltage and the load current, chip junction temperature can be very high. Consider the design to be Tj ≤ Tjmax = 150 °C in all possible operating temperature range. On the reverse side of the package (HTSOP-J8, TO263-5) there is exposed heat pad for improving the heat dissipation. Should by any condition the maximum junction temperature Tjmax = 150 °C rating be exceeded by the temperature increase of the chip, it may result in deterioration of the properties of the chip. The thermal impedance in this specification is based on recommended PCB and measurement condition by JEDEC standard. Verify the application and allow sufficient margins in the thermal design by the following method is used to calculate the junction temperature Tj. Tj can be calculated by either of the two following methods. 1. The following method is used to calculate the junction temperature Tj. TjTaPCθJA Where: Tj : Junction Temperature Ta : Ambient Temperature PC : Power Consumption θJA : Thermal Impedance (Junction to Ambient) 2. The following method is also used to calculate the junction temperature Tj. TjTTPCΨJT Where: Tj : Junction Temperature TT : Top Center of Case’s (mold) Temperature PC : Power consumption ΨJT : Thermal Impedance (Junction to Top Center of Case) The following method is used to calculate the power consumption Pc (W). PcVCC‐VO IOVCCICC Where: PC : Power Consumption VCC : Input Voltage VO : Output Voltage IO : Load Current ICC : Circuit Current |
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