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RT2519W データシート(PDF) 10 Page - Richtek Technology Corporation |
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RT2519W データシート(HTML) 10 Page - Richtek Technology Corporation |
10 / 13 page RT2519W 10 DS2519W-00 May 2019 www.richtek.com © Copyright 2019 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. The RT2519W output voltage will be closed to zero when output short circuit occurs as shown in Figure 1. It can reduce the chip temperature and provides maximum safety to end users when output short circuit occurs. The junction temperature should never exceed the absolute maximum junction temperature TJ(MAX), listed under Absolute Maximum Ratings, to avoid permanent damage to the device. The maximum allowable power dissipation depends on the thermal resistance of the IC package, the PCB layout, the rate of surrounding airflow, and the difference between the junction and ambient temperatures. The maximum power dissipation can be calculated using the following formula : PD(MAX) = (TJ(MAX) − TA) / θJA where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. For continuous operation, the maximum operating junction temperature indicated under Recommended Operating Conditions is 125 °C. The junction-to-ambient thermal resistance, θJA, is highly package dependent. For a VDFN-8AL 3x3 package, the thermal resistance, θJA, is 30.2 °C/Won a standard JEDEC 51-7 high effective-thermal- conductivity four-layer test board. The maximum power dissipation at TA = 25 °C can be calculated as below : PD(MAX) = (125 °C − 25°C) / (30.2°C/W) = 3.31W for a VDFN-8AL 3x3 package. The maximum power dissipation depends on the operating ambient temperature for the fixed TJ(MAX) and the thermal resistance, θJA. The derating curves in Figure 2 allows Figure 1. Short-Circuit Protection when Output Short- Circuit Occurs VOUT Short to GND VOUT IOUT IC Temperature ILIM’ the designer to see the effect of rising ambient temperature on the maximum power dissipation. Figure 2. Derating Curve of Maximum Power Dissipation 0.0 0.8 1.6 2.4 3.2 4.0 0 25 50 75 100 125 Ambient Temperature (°C) Four-Layer PCB |
同様の部品番号 - RT2519W |
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同様の説明 - RT2519W |
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