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LSF0204: circuit analysis

Part Number: LSF0204

Hi team,

As shown in the schematic diagram, after LSF0204 is welded on, connect 5V power supply and VREF_ The 1.8V at a is raised to 2.7V by lsf0204 chip, which affects the working voltage of other circuits.

Please help to analyze it.

thanks,

Best regards,