As shown in FIG grounds ISO124 and MC78L05, an external regulator MC79L05 and DCP011515 constituted improve power supply rejection ratio (PSR) circuit. Input signal VIN (maximu
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m swing 10V) output by the isolation after ISO124. Isolated DC/DC DCP011515 change is responsible for providing isolated power supply, and in between DCP011515 and ISO124 added two three-terminal integrated power supply MC78L05 and MC79L05. MC78L05 and MC79L05 is Motorola products, MC78L05 output + 5V, 100mA, MC79L05 output -5V, 100mA. Use MC78L05 and MC79L05 as an auxiliary regulator adjusted so without reducing the 10V input range conditions can reduce power-supply rejection ratio error.
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