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BDXXFA1FP3 Datasheet(PDF) 8 Page - Rohm |
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BDXXFA1FP3 Datasheet(HTML) 8 Page - Rohm |
8 / 17 page 8/14 BDxxFA1FP3 Datasheet TSZ02201-0GAG0A600600-1-2 © 2015 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 08.Jun.2015 Rev.003 ● Power Dissipation ◎ SOT89-3K 0 0.5 1 1.5 2 0 255075 100 125 150 周囲温度: Ta [℃ ] 1.67W θj‐a = 74.8℃/W Ambient Tempearture : Ta [°C] Measurement condition: mounted on 4-layer JEDEC standard board Board size: 114.3mm × 76.2mm × 1.6mm When considering thermal design, operation should be maintained within the following conditions. (The temperature mentioned below is a guaranteed temperature, therefore, margins must be considered.) 1. Ambient temperature Ta is 85°C and below. 2. Junction temperature Tj is 150°C and below. The junction temperature Tj can be determined as follows: Calculation based on ambient temperature Ta Tj=Ta+θj-a×W <Reference Value> ・θ j-a: SOT89-3K 74.8°C/W JEDEC standard 4 layers PCB Board size: 114.3mm × 76.2mm × 1.6mm Most of the heat loss that occurs in BDxxFA1FP3 is generated from the output Pch FET. Power loss is determined by the product of voltage drop across Vcc-Vo and the output current. Check the conditions of output voltage and output current to be used between Vcc-Vo and compare with the power dissipation characteristics. In addition, power dissipation may change significantly due to board conditions because BDxxFA1FP3 uses power package. It is important to consider the board size to be used before proceeding with the design. Power consumption [W] = { Input voltage (Vcc) – Output voltage (Vo) } × Output current (Io: Ave) |
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