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AN2747 Datasheet(PDF) 40 Page - STMicroelectronics |
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AN2747 Datasheet(HTML) 40 Page - STMicroelectronics |
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40 / 44 page  Firmware flowchart AN2747 40/44 Below Figure 39 shows a diagram of total ballast efficiency versus input voltage. The system efficiency is obtained as a ratio of lamp power to input power. Figure 39. Ballast efficiency 13.6 Thermal measurement In the output stage a thermal measurement on the power device has been performed. On the devices a heat sink having thermal resistance Rth = 3.23 °C/W has been mounted. The temperature was measured on the top of the packages of the power devices by means of a thermocouple. A ∆T of 55 °C above ambient temperature has been measured. 14 Firmware flowchart A simplified firmware flowchart is given in Figure 40. Table 4. Power factor and input current THD measurements Vin (rms) V Power factor THD% 115 0.994 10 230 0.940 27 |
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