UM0670 datasheet(23/43 Pages) STMICROELECTRONICS

部件名	UM0670

功能描述	80 W offline LED driver with PFC

PDF	43 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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23 / 43 page

Measurement

UM0670

23/43

Doc ID 15327 Rev 2

output current ripple is reduced to 92 mA (see Figure 13). However, there are some

limitations for the capacitors used in dimmable applications, as capacitors that are too large

cause a decrease in dimming resolution (minimum duty cycle is limited). The 470 nF

capacitor used on the STEVAL-ILL013V1 is a good compromise between lower output

current ripple and good dimming resolution, as illustrated in Figure 12.

Figure 20.

LED current ripple for the 100 nF output capacitor

9.4

Standard EN61000-3-2 measurement

Figure 21.

EN61000-3-2 analysis for LED current of 350 mA and VIN from 85 V to 160 VAC

EN61000-3-2 analysis for LED current 350 mA at 12 LEDs VIN from 85 V to 160 V AC

200

400

600

800

1000

1200

13579

135 79

13579

13 579

1 3579

85 V

100 V

110 V

120 V

140 V

160 V

Current

[mA]

Real

Limits

AM00406

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