LM5009 datasheet in PDF format, roughly 1.56 MB. The LM5009 is a Texas Instruments (originally National Semiconductor) step-down switching regulator for high input voltage applications, and the document covers its pinout, operating principle, component selection and layout guidance. Technicians use it to check the feedback and enable pins, calculate expected output voltage from the divider, and judge whether a failed regulator or its surrounding parts caused the fault. Verify the package marking before replacing, as packages differ in footprint.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @ic_mosfet_pdf_datasheets. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.