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AP1512A-12K5 Datasheet(PDF) 9 Page - Anachip Corp |
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AP1512A-12K5 Datasheet(HTML) 9 Page - Anachip Corp |
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9 / 12 page  AP1512/A 50KHz, 2A/3A PWM Buck DC/DC Converter Anachip Corp. www.anachip.com.tw Rev.1.1 Oct. 14, 2005 9/12 Function Description (Continued) The AP1512/A (TO-263 package) junction temperature rise above ambient temperature with a 2A load for various input and output voltages. This data was taken with the circuit operating as a buck switching regulator with all components mounted on a PC board to simulate the junction temperature under actual operating conditions. This curve can be used for a quick check for the approximate junction temperature for various conditions, but be aware that there are many factors that can affect the junction temperature. When load currents higher than 2A are used, double sided or multilayer PC boards with large copper areas and/or airflow might be needed, especially for high ambient temperatures and high output voltages. For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (Once exception to this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. Package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these numbers. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multilayer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board. Marking Information (1) TO263-5L 1512X-XX Blank: ADJ Logo ID code Year: ( Top View ) "02" = 2002 "01" = 2001 YY WW X Xth week: 01~52 Part Number: -Output Type: -33: 3.3V -50: 5.0V -12: 1.2V Blank: AP1512 A: AP1512A (2) TO220-5L 1512X-XX ID code Year: ( Top View ) "02" = 2002 "01" = 2001 YY WW X Xth week: 01~52 Blank: ADJ Logo Part Number: -Output Type: -33: 3.3V -50: 5.0V -12: 1.2V Blank: AP1512 A: AP1512A |
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