555 electronic ballast circuit

Published:2011/5/24 2:52:00 Author:TaoXi | Keyword: electronic, ballast | From:SeekIC

As the figure 17-20 shows, the electronic ballast is composed of the step-down rectifier circuit, the multivibrator source circuit, the Schmitt trigger and the promotion stage. The bridge rectifying voltage is 300V, and this voltage is used as the promotion stage's power supply voltage. IC(556)'s power supply voltage VDD=6V, the left part of IC and the R6，R1，C9 constitute the astable multivibrator, the oscillation frequency f=1.44/(R6+R1)C9, the parameters of the figure's oscillation frequency is about 45kHz, because R1=R6, so the duty cycle is about 50%, it is the symmetrical square wave. The right part of the IC constitutes the Schmitt trigger.



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