Procedures To Design 120vac Cfl Solutions With The Ir2520d

 This application note (AN) is intended for helping the design of CFL ballasts, 120VAC input using
the IR2520D Ballast Control HVIC. The information enclosed will help in adapting the reference
design IRPLCFL5U to different lamp types. Please refer to the IRPLCFL5U reference design and
to the IR2520D datasheet for additional information on the design, including electrical
parameters, state diagram and complete functional description.    
Typical Circuit for 120VAC CFL Applications...............................................
CFL Ballast Design Requirements and Constraints.....................................
Evaluation Reference Design IRPLCFL5U ..................................................
Design Procedure to Adapt the IRPLCFL5U Design to a Different Lamp ....
Adapt the IRPLCFL5U to 18W Lamps .........................................................
Adapt the IRPLCFL5U to 32W Lamps .........................................................
Adapt the IRPLCFL5U to 42W Lamps .........................................................
 5. Design procedure to adapt the IRPLCFL5U design to a different lamp
The design with the IR2520D is very simple because it only has 2 control pins: VCO (0-5VDC
oscillator voltage input) and FMIN (minimum frequency setting). To modify the design for a higher
lamp power, you will need to modify RFMIN, CVCO, LRES and CRES. Make sure that FETs and
inductors are rated to the current you need with the new lamp and that VCC is stable. To modify the
design to a lower lamp power, you will need to decrease RFMIN and only in some case to modify
also CVCO, LRES and CRES. In most cases you CAN use FETs and inductors with lower current
ratings.
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IRPLCFL5U Circuit Diagram
IRPLCFL5U Circuit Diagram



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