A description is given of a self oscillating CFL circuit (demo board PR39922), which is able to drive a standard Osram Dulux T/E GX24q-3 lamp or similar lamp types with a nominal lamp power of 26W. However, the lamp power is fixed at about 22 W so that the total power drawn from the mains is about 25 W or less. The circuit is based on a Voltage Fed Half Bridge Inverter topology. It is designed for a nominal mains voltage of 230 Vrms where instant-start is applied for instant light output.
Self Oscillating 25w Cfl Lamp Circuit application circuits
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The Half Bridge switching devices are the bipolar power switching Transistors of type BUJ101AU. The BUJ101AU is driven and controlled by a driver transformer. The driver transformer saturates at a defined current level so that the lamp current is controlled in an indirect way. The key drivers for this design are very low cost and low component count.
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