AN2811 datasheet(18/25 Pages) STMICROELECTRONICS

No de pièce	AN2811

Description	High brightness LEDs are becoming a prominent source of lighting

PDF	25 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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18 / 25 page

Test results and waveforms

AN2811

18/25

Doc ID 14904 Rev 1

During the startup phase the output voltage response is optimized. No output voltage

overshoot nor voltage spike has occurred thanks to the soft-start function and optimum

regulation performance provided by the VIPer17. In Figure 26 and Figure 27 the waveform

is captured at 176 VAC. In Figure 28 and Figure 29 the waveform is captured at 264 VAC.

Figure 26.

Startup of Vo and Io at 176 VAC, one

LED

Figure 27.

Startup of Vo and Io at 176 VAC, two

LEDs

Top trace: Io (200 mA/div)

Bottom trace: Vo (2 V/div)

Time: 10 ms/div

Top trace: Io (200 mA/div)

Bottom trace: Vo (2 V/div)

Time: 10 ms/div

Figure 28.

Startup of Vo and Io at 264 VAC, one

LED

Figure 29.

Startup of Vo and Io at 264 VAC, two

LEDs

Top trace: Io (200 mA/div)

Bottom trace: Vo (2 V/div)

Time: 10 ms/div

Top trace: Io (200 mA/div)

Bottom trace: Vo (2 V/div)

Time: 10 ms/div

AN2811 Fiches technique(PDF) 18 Page - STMicroelectronics