AN4376 datasheet(35/37 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

Logo

35 / 37 page

DocID025380 Rev 1

35/37

AN4376

PFC waveforms

7.9

Conducted emission pre-compliance test

From Figure 48 to Figure 51 are the average measurements of the conducted noise with 23

LED load and nominal mains voltages. The limits shown on the diagrams are those of the

EN55022 Class-B, which is the most popular standard for domestic equipment. As visible in

the diagrams, good margins with respect to the limits are present in all test conditions.

Increasing the CX capacitor value of the EMI filter will improve the safe margin but affecting

the PF. A compromise has been fixed in this design.

Note that a CY capacitor between the negative output pin of the converter and ground has

been placed to filter common mode noise flowing into the demonstration board.

Figure 48. 100 VAC and 23 LED load - phase

Figure 49. 100 VAC and 23 LED load - neutral

Figure 50. 230 VAC and 23 LED load - phase

Figure 51. 230 VAC and 23 LED load - neutral

AN4376 Datasheet(PDF) 35 Page - STMicroelectronics