555 positive voltage converting to 5v power supply circuit

Published:2011/7/24 4:06:00 Author:Lucas | Keyword: 555 positive voltage , 5v power supply | From:SeekIC

The 555 and R1, C1, VT1 and other components in Figure 9-2 form a multivibrator with the oscillation frequency being determined by R1, C1, R3 . C1 charges through R1, when the the potential of pin 6 charges to above 2/3 VDD of the threshold level, the 555 resets, pin 3 is at low level. DW is a Zener diode, when the negative output voltage is prompted to turn on D5, VT1 remains cut-off state. When the load current makes C1 discharge to a certain extent, D5 is deadline, and VT1 is turned on, then C1 begins to charge. The oscillation frequency of 555 changes with a certain load. Power load adjusted rate is about 1.5%.



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