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Summary
Switching Step Down Regulator
An Astable clock triggers a Monoshot. The pulse width of oneshot is modulated by a feedback of the filtered supply at pin 5. PWM of oneshot is filtered for output.
Time Delay Power off
This circuit uses the two internal 1/3 and 2/3 comparators to create a Time delay switch.


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Switching Step Down Regulator and Time Delay Power off - NE555 Page 27

Switching Step Down Regulator and Time Delay Power off - Signetics NE555 Page 27


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