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AMS2596 Datasheet(PDF) 11 Page - Advanced Monolithic Systems |
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AMS2596 Datasheet(HTML) 11 Page - Advanced Monolithic Systems |
11 / 15 page AMS2596 3A 30V Step-Down Converter 3/4/2010 www.advanced-monolithic.com Phone (925) 443-0722 11 Fax (925) 443-0723 Output Power and Thermal Limits The AMS2596 junction temperature, Step-Down converter and LDO current capability depends on the internal dissipation and the junction to case thermal resistance of the SO8 exposed paddle package. This gives the junction temperature rise above the device paddle and PCB temperature. The temperature of the paddle and PCB will be elevated above the ambient temperature due to the total losses of the step down converter and losses of other circuits and or converters mounted to the PCB. Tjmax=Pd·θjc+Tpcb+Tamb The losses associated with the AMS2596 overall efficiency are; 1. Output Diode Conduction Losses 2. Inductor DCR Losses 3. AMS2596 Internal losses a. Power Switch Forward Conduction and Switching Losses b. Quiescent Current Losses The internal losses contribute to the junction temperature rise above the case and PCB temperature. The junction temperature depends on many factors and should always be verified in the final application at the maximum ambient temperature. This will assure that the device does not enter over-temperature shutdown when fully loaded at the maximum ambient temperature. Figure 2. AMS2596 SO-8 Evaluation Board Top Figure 3. AMS2596 SO-8 Evaluation Board Bottom |
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