Diagram of Electronic Ballast Circuit composed of UBA2014

Published:2011/8/9 18:05:00 Author:Vicky | Keyword: Electronic Ballast | From:SeekIC

36W electronic ballast circuit diagram is shown in the above picture. When the power supply AC is on, it can charge capacitance C2 in the pin VDD of UBA2014 via the current of resistances R12 and R11. When the voltage of C2 rises to 13V, VCO inside the oscillator begins vibrating, and half-bridge power level composed by Q1 and Q2 generates output. When the oscillator begins working, the frequency is ｆｍａｘ＝１００ｋＨｚ, and then it soon goes down to preheat frequency ｆｐｎ. The preheat time is determined by R1 and R5. When R1 equals ３３ｋΩ, and C5 equals ３３０ｎＦ, the preheat time ｔｐｈ equals 1.8 seconds. Once the preheat is over, the output frequency of ballast goes down again. During this procession, series circuit LC composed by output ends L1 and C15 begins vibrating, and then a high-voltage pulse is generated in the ends of C15, which goes through the light tube and then ignites. The frequency of oscillator reduces to ｆｍｉｎ＝４０ｋＨｚ.



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