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Ballast for Energy-saving Lamps

CFL preheats, ignites and lights on single-chip driver

Ballast for Energy-saving Lamps
As opposed to the good old light bulb, a CFL needs an amount of electronics to start and light properly. Here we show a suitable circuit. This compact ballast is intended for driving a 20-watt ‘bare’ CFL tube or bulb, that is, one without a driver circuit built into its socket that makes it ready to screw into an existing lamp socket.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1 = 470kΩ
R2 = 82kΩ
C1 = 100nF 25V
C2 = 470pF 1000V
C3 = 33nF 630V
C4 = 10µF 400V
C5 = 10µF 50V
C6 = 2nF7 1000V
L1 = 2.5mH; 280 turns 0.2mm ECW on E19 bobbin (EPCOS)
D1,D2,D7 = UF4007
D3-D6 = 1N4007
IC1 = FAN7710N (Fairchild)
K1,K2,K3 = PCB terminal block, 7.5mm lead pitch
F1 = fuse, 100mAT (slow)
PCB, FAN7710N IC and 2.5 mH coil; order code 070638-71
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