AN4376 datasheet(27/37 Pages) STMICROELECTRONICS

Part #	AN4376

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

PDF	37 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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27 / 37 page

DocID025380 Rev 1

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AN4376

PFC waveforms

7.5

OVP protection and no load behavior

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 (100 V) (see the HVLED815PF datasheet [1. in Section 8:

Supporting material on page 36]).

As shown in Figure 35 and Figure 37 the converter works in a burst mode during no load

condition. No current is flowing into the LED load.

Figure 34. Load disconnection

at 100 VAC - 50 Hz

Figure 35. No load behavior

at 100 VAC - 50 Hz

CH1: DRAIN

CH2: IOUT

CH3: VOUT

CH4: DMG

CH1: DRAIN

CH2: IOUT

CH3: VOUT

CH4: DMG

Figure 36. Load disconnection

at 230 VAC - 50 Hz

Figure 37. No load behavior

at 230 VAC - 50 Hz

CH1: DRAIN

CH2: IOUT

CH3: VOUT

CH4: DMG

CH1: DRAIN

CH2: IOUT

CH3: VOUT

CH4: DMG

AN4376 Datasheet(PDF) 27 Page - STMicroelectronics