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Home › Magazines › 2008 › January › Ballast for Energy-saving Lamps

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Ballast for Energy-saving Lamps

CFL preheats, ignites and lights on single-chip driver

Published in issue 373, January 2008

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.

Components

Relevant websites

Relevant products

Resistors
R1 = 470kΩ
R2 = 82kΩ
Capacitors
C1 = 100nF 25V
C2 = 470pF 1000V
C3 = 33nF 630V
C4 = 10µF 400V
C5 = 10µF 50V
C6 = 2nF7 1000V
Inductor
L1 = 2.5mH; 280 turns 0.2mm ECW on E19 bobbin (EPCOS)
Semiconductors
D1,D2,D7 = UF4007
D3-D6 = 1N4007
IC1 = FAN7710N (Fairchild)
Miscellaneous
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

Click below to download a PDF copy of this article from Elektor magazine.

 

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Magazine January 2008
EN373 (US $ 6.30)
 

Order from Elektor 
PCB, FAN7710N and 2.5mH coil
070638-71 (US $ 25.50)
 

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PCB, bare
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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