STEVAL-ILL013V1 Datasheet, PDF (23/43 Pages) STMicroelectronics – 80 W offline LED driver with PFC

Measurement
UM0670
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 V_IN from 85 V to 160 VAC
1200
EN61000-3-2 analysis for LED current 350 mA at 12 LEDs VIN from 85 V to 160 V AC
1000
800
Current
[mA] ⁶⁰⁰
400
200
0
13579
1 3 57 9
13579
13579
1 35 7 9
13579
85 V
100 V
110 V
120 V
140 V
160 V
Real
Limits
AM00406
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Doc ID 15327 Rev 2