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555 high/low voltage monitor circuit 1

2015-01-28 16:03  
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555 high/low voltage monitor circuit 1
555 high/low voltage monitor circuit 1
As shown in the figure 9-17, the input voltage VDD is stabilized voltage supply, it requires hypotension outputs steady voltage, the load current reaches dozens of mA. The actable multivibrator is made of IC1 and R1, R2, C1, the oscillation frequency is f=1.44/ (R1+2R2)C1, generally speaking, the oscillation frequency should be about 10KHz. The pulse width modulator is composed of IC2 and R3, R4, C2, the filter smoothing circuit consists of L, C3, it makes the hgih duty ratio square wave smooth which is exported by IC2, the output voltage Vo is fed back and added to the control terminal of IC2, the width is modulated constantly.