AN3032 Datasheet, PDF (20/26 Pages) STMicroelectronics – This application note describes a demonstration board able to drive

Adapting the design for a 2 x 36 W T8 electronic ballast
AN3032
5
Adapting the design for a 2 x 36 W T8 electronic
ballast
The design developed for 2 x 58 W T8 tubes can be adapted to fit 2 x 36 W T8 tubes. Using
the same resonant circuit, minor adjustments need to be made to the operating frequencies
of the lamp.
Equation 18
f_run = 49kHz f_preh = 65 kHz
By means of Equation 1, 2 and 3, the following components can be calculated.
Equation 19
R₁₄ = 27kΩ R₁₃ = 77kΩ C₆ = 267(220 + 47)nF
To improve the 2 x 36 W board performance, we suggest inserting a capacitor C₄ set at
220 nF and a resistor R₂₁ set at 68 Ω.
20/26
Doc ID 16165 Rev 2