AN_UBA2024T_15 Datasheet, PDF (16/18 Pages) NXP Semiconductors – CFL applications

Philips Semiconductors
CFL applications with the UBA2024T
APPLICATION NOTE
7 QUICK MEASUREMENTS
Table 4: Measured values compared with calculated values
Lamp Input voltage Input
preheat
power /frequency⁴ configuration
f out set
fout
Ilamp calculated
measured⁵ using f out measured
3W 115V/50Hz standard
Yes
28.8kHz 29.1kHz
95mA
3W 230V/50Hz standard
Yes
28.8kHz 29.0kHz
96mA
8W 115V/60Hz doubler
No
45.9kHz 48.7kHz
145mA
8W 230V/50Hz standard
No
45.9kHz 48.6kHz
147mA
11W 115/60Hz doubler
No
42.5kHz 45.1kHz
148mA
11W 230V/50Hz standard
No
42.5kHz 44.7kHz
150mA
13W 115/60Hz doubler maximum 42.5kHz 44.0kHz
120mA
13W 230V/50Hz standard maximum 42.5kHz 44.0kHz
120mA
14W 115V/60Hz doubler
No
42.5kHz 45.2kHz
139mA
14W 230V/50Hz standard
No
42.5kHz 44.8kHz
140mA
15W 230V/50Hz standard
No
39.7kHz 41.4kHz
161mA
Ilamp
measured
97mA
94mA
138mA
144mA
142mA
148mA
115mA
127mA
129mA
141mA
171mA
Figure 5: Cold starting lamp waveforms.
(CSW=10nF)
4 _{Measurement for 115V/60Hz were done at 115V/50Hz with 15% extra capacitance added to CBUF1 and CBUF2.}
5 _{A 5% resistor was used for Rosc, and a 10% capacitor was used for Cosc. Tolerances of Rosc and Cosc both add to frequancy tolerance of IC.}
Use Rosc and Cosc with less tolerance if better match between calculated and measured frequency is needed.
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