CFL applications with the UBA2024T

APPLICATION NOTE

Philips Semiconductors

8

between 25kHz and 30kHz or between 40kHz and 50kHz. This is because below 25kHz there may be audible noise,

operation in the 30kHz to 40kHz band may result in interference with infra-red remote control and above 50kHz the

third harmonic is in the range where conducted noise requirements for most countries have to be met. Since

inductors and capacitors decrease in size and cost with increase in frequency, the 40 to 50kHz range is preferred.

Throughout this application note we will presume the lamp frequency will be in this range.

OSC

OSC

OSC

out

C

R

k

1

f

=

figure 4.