AN4346 datasheet(29/33 Pages) STMICROELECTRONICS

Part #	AN4346

Description	10 W wide range - high power factor - isolated LED driver using HVLED815PF

PDF	33 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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29 / 33 page

DocID025107 Rev 1

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AN4346

Electrical waveform

3.6

OVP protection to a load disconnection

During a load disconnection the HVLED815PF device senses the output voltage through the

DMG pin and controls the voltage loop in order to regulate the output capacitor voltage to

a level below its maximum rating.

As shown in Figure and Figure 44 the converter works in burst mode during no load

condition.

Figure 41. Load disconnection at 100 Vac -

50 Hz

Figure 42. No load behavior at 100 Vac - 50 Hz

CH1: DRAIN pin

CH2: IOUT

CH3: VOUT

CH4: DMG pin

CH1: DRAIN pin

CH2: IOUT

CH3: VOUT

CH4: DMG pin

Figure 43. Load disconnection at 230 Vac

- 50 Hz

Figure 44. No load behavior at 230 Vac - 50 Hz

CH1: DRAIN pin

CH2: IOUT

CH3: VOUT

CH4: DMG pin

CH1: DRAIN pin

CH2: IOUT

CH3: VOUT

CH4: DMG pin

AN4346 Datasheet(PDF) 29 Page - STMicroelectronics