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Negative power supply circuit using TLC555

2015-03-23 19:32  
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Negative power supply circuit using TLC555
1B32 miniaturized package and high reliability index make it ideal for portable pressure detection system. Since 1B32 needs a negative supply, the Fig shows a practical circuit which can produce a negative voltage. It uses +12 V battery's positive pole to drive a CMOS TLC555 timer, and its typical supply current is 360μA. The timer outputs square wave to get 9V power after being rectified and filtered. 1B32 excitation voltage should be equal to or less than +9 V in order to stay out of regulating margin.