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AN2590 Scheda tecnica(PDF) 3 Page - STMicroelectronics

Il numero della parte AN2590
Spiegazioni elettronici  20 W dimmable CFL ballast solution
PDF  17 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2590 Scheda tecnica(HTML) 3 Page - STMicroelectronics

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Figure 1.
Typical dimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2.
Dimming CFL ballast solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 3.
Typical dimming system consisting of incandescent lamp and triac dimmer . . . . . . . . . . . . 4
Figure 4.
Block diagram of formal CFL ballast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 5.
The half AC line cycle of sinuous wave and firing angle. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 6.
Schematic of the reference design board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 7.
Main circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 8.
L1 current per switching period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 9.
L1 current shape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 10.
PCB top-side view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 11.
PCB bottom-side view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 12.
Full load efficiency vs. AC line input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 13.
Triac turn-on time vs. power dissipation to the lamp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 14.
AC input voltage and current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 15.
L1 voltage and current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 16.
Power factor in operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 17.
Lamp voltage and current at Ton=9 ms, Vlamp=100 V/div, Ilamp= 200 mA/div. . . . . . . . . 13
Figure 18.
Lamp voltage and current at Ton=5 ms, Vlamp=100 V/div, Ilamp= 200 mA/div. . . . . . . . . 13
Figure 19.
Lamp voltage and current at Ton=3 ms, Vlamp=100 V/div, Ilamp= 200 mA/div. . . . . . . . . 13



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