STEVAL-ILL027V2 demonstration board

AN3111

20/23

Doc ID 16815 Rev 2

Figure 17.

EMI measurement - detector quasi-peak

Figure 18

shows LED current for the input voltage between 180 and 260 V AC. Minimum

measured LED current is 318 mA for 180 V and maximum measured LED current is 358 mA

for 260 V. Figure 19 shows efficiency for different input voltages. The efficiency is 71% for

input voltage 230 V AC. Figure 20 demonstrates LED current for a different number of LEDs

connected as the load. If 15 LEDs are connected (LED forward voltage is 47 V), the LED

current is 358 mA. If 19 LEDs are connected (LED forward voltage is 59 V), the LED current

is 331 mA.

Figure 18.

LED current vs. input voltage