200w fluorescent electronic ballast circuit

Crystal oscillator

Quartz Oscillator 3225 20M OSC

200w fluorescent electronic ballast
$/> Due to the unique bootstrap structure function inside the L6569, the bootstrap diode connected between pin 1 and pin 8 can be omitted (also set). R2 and C2 form a power-start circuit, and the power supply voltage Vcc is clamped at about 15V by an internal shunt regulator. R3 and C3 determine the frequency of the internal oscillator of the IC. The lower limit of the triangular wave voltage on C3 is 1/3VCC. The oscillator output controls the high-side output and low-side output of the IC. The dead-time between the two output square-wave drive pulses is typically 1.2uF. C4 is the bootstrap capacitor. VCC charges the internal charge pump between pin 1 and pin 8 to charge C4, so that the voltage on pin 8 is higher than the voltage on pin 6, which supplies power to the high-end output driver stage in the IC. The square wave pulse is output at the midpoint of Q1 and A2 (ie, the 6th pin of the IC) as a high-frequency power supply for the fluorescent lamp. The output stage circuit uses a conventional LC series resonant type. The PTC thermistor is used for cathode preheating and C6 is the lamp starting capacitor. Fluorescent electronic ballast. Due to the L6569 driver IC, the pulse transformer can be omitted. The working efficiency of the ballast is no longer affected by the output feedback circuit, which is easy to design and stable. The L6569 is not only suitable for CFL electronic ballasts, but also for low voltage halogen converters. </p> </div> </div> <div class="tech-detail-share">  <div class="bdsharebuttonbox"> <a href="#" class ="bds_qzone" data-cmd="qzone" title="Share to QQ space"></a> <a href="#" class="bds_tsina" data-cmd="tsina" title="Share to Sina Wei Bo"></a> <a href="#" class="bds_weixin" data-cmd="weixin" title="Share to WeChat"></a> <span>Share to:</span> </ Div> <script>window._bd_share_config = { "common": { "bdSnsKey": {}, "bdText": "", "bdMini": "1", "bdMiniList": false, "bdPic": "", "bdStyle": "2", "bdSize": "16" }, "share": {} }; with (document) 0[(getElementsByTagName($

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