555 emergency DC fluorescent lamp circuit

Published:2011/5/22 20:40:00 Author:TaoXi | Keyword: emergency, DC, fluorescent lamp | From:SeekIC

As the figure 17-19 shows, the astable multivibrator is composed of the 555 and R1，R2，C2, the oscillation frequency f=1.44/(R1+2R2)C2. The parameters of the figure have the high frequency oscillation frequency of 70kHz. The high-frequency square wave signal from the pin-3 is limited, then it adds to the VT tube, after the process of boost, this signal drives the light to turn on. The transformer iron core uses the GU30X20 ferrite tank shape iron core.



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