Improve power supply rejection ratio PSR circuit diagram ISO124

Posted on Mar 28, 2007

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

Improve power supply rejection ratio PSR circuit diagram ISO124
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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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