English
Language : 

AN_UBA2024T_15 Datasheet, PDF (3/18 Pages) NXP Semiconductors – CFL applications
◁
Philips Semiconductors
CFL applications with the UBA2024T
APPLICATION NOTE
1 INTRODUCTION................................................................................................................................................................................4
2 FEATURES ............................................................................................................................................................................................4
3 Application photos ...............................................................................................................................................................................5
4 Circuit Diagram....................................................................................................................................................................................6
5 SELECTING COMPONENT VALUES........................................................................................................................................7
5.1 Selecting input configuration, buffer capacitor and fuse-resistor........................................................................................7
5.2 Choosing frequency, lamp inductor and lamp capacitor.......................................................................................................7
5.3 Ignition frequency and preheating.............................................................................................................................................9
5.4 Choosing the other components..................................................................................................................................................9
5.5 About component tolerances .......................................................................................................................................................9
6 EXAMPLES OF CALCULATING COMPONENT VALUES .............................................................................................11
6.1 EXAMPLE 1: a 3W lamp (2.5W/90mA burner) .....................................................................................................................11
Determining component values for 115V/60Hz mains.................................................................................................... 11
Determining component values for 230V/50Hz mains.................................................................................................... 11
6.2 EXAMPLE 2: a 14W lamp (12W/150mA burner, suited for cold ignition).......................................................................12
Determining component values for 115V/60Hz mains.................................................................................................... 12
Determining component values for 230V/50Hz mains.................................................................................................... 12
6.3 Some other examples ..................................................................................................................................................................13
8W lamp (7W/150mA burner, suited for cold ignition) (fout=46kHz) ........................................................................... 13
11W lamp (9.5W/150mA burner, suited for cold ignition) (fout=42.5kHz).................................................................. 13
13W lamp (11W/125mA burner, needing warm ignition) (fout=42.5kHz).................................................................... 14
15W lamp (12.5W/180mA burner, suited for cold ignition) (fout=40kHz).................................................................... 14
12W DEMO BOARD LAMP :............................................................................................................................................. 15
7 QUICK MEASUREMENTS ...........................................................................................................................................................16
APPENDIX 1 Application board layout exa mple ............................................................................................................. 18
3
 ▷