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This is a practical value of the NC DC regulated power supply. Key circuit has three: one is the output circuit, how to achieve the 0-9.9V stepping 0.1V, how to ensure that the output current should reach 500mA Q-wave is less than 10mV, and voltage regulator to fine features, the output voltage of the error should be as small as possible. Second, NC circuit, he should be a bit dynamic and automatic scanning of two-9.9V stepping 0.1V output current I0 ≥ 500mA, ripple voltage <10mV, and has a regulator function.
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