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AN2811 Datasheet(PDF) 4 Page - STMicroelectronics

Part # AN2811
Description  High brightness LEDs are becoming a prominent source of lighting
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2811 Datasheet(HTML) 4 Page - STMicroelectronics

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List of figures
AN2811
4/25
Doc ID 14904 Rev 1
List of figures
Figure 1.
STEVAL-ILL017V1 demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2.
Conventional buck converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3.
Modified buck converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 4.
Flyback converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 5.
Schematic diagram of demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6.
Top view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7.
Bottom view with SMD parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 8.
Winding structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 9.
Bobbin outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 10.
Efficiency versus input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 11.
Standby power versus input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 12.
Vin and Iin at 176 VAC, one LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 13.
Vin and Iin at 176 VAC, two LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 14.
Vin and Iin at 264 VAC, one LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 15.
Vin and Iin at 264 VAC, two LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 16.
Inrush current at LINE IN, one LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 17.
Inrush current at LINE IN, two LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 18.
Vds and Id at 176 VAC, one LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 19.
Vds and Id at 176 VAC, two LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 20.
Vds and Id at 264 VAC, one LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 21.
Vds and Id at 264 VAC, two LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 22.
Vo and Io at 176 VAC, one LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 23.
Vo and Io at 176 VAC, two LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 24.
Vo and Io at 264 VAC, one LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 25.
Vo and Io at 264 VAC, two LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 26.
Startup of Vo and Io at 176 VAC, one LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 27.
Startup of Vo and Io at 176 VAC, two LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 28.
Startup of Vo and Io at 264 VAC, one LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 29.
Startup of Vo and Io at 264 VAC, two LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 30.
Vdd and Vds at 264 VAC, output in short-circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 31.
Io at 264 VAC, output in short-circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 32.
Vdd and Vds at 264 VAC, output in open-circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 33.
Startup of Vdd and Vds at 264 VAC, output in open-circuit . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 34.
Completed demonstration board connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 35.
Connection of AC line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 36.
Connection of LED lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21


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