Datasheet for the ROHM BD9285F, 1.08 MB PDF. The F suffix in ROHM naming denotes an SOP package. Datasheets like this provide the pin assignment, block diagram, operating conditions, protection functions and a reference application circuit. A technician uses it to check the voltage and signal expected on each pin, find feedback and overcurrent sense points, and work out why the IC goes into protection. Verify the full marking on the chip matches before substituting parts.
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