STEVAL-ILL013V1 Datasheet, PDF (21/43 Pages) STMicroelectronics – 80 W offline LED driver with PFC

Measurement
UM0670
Figure 16. Output LED current for different LED voltage (I_LED = 700 mA)
VLED v s. ILED for nominal LED current 700 mA
800
700
600
LED ₅₀₀
current
[mA] ⁴⁰⁰
300
200
100
0
82
700 mA
101
121
139
LED voltage [V]
AM00404
Figure 17 shows the output LED current waveform for the output LED current of 1000 mA.
The current ripple is 433 mA and the switching frequency for the modified buck converter is
55 kHz. The input voltage was 230 VAC and 4 LEDs were used as the load (OSTAR LED LE
UW E3B see Section 11: References and related materials: 6). The output LED current
accuracy for the different LED voltages is shown in Figure 18.
Figure 17. Output LED current waveform (I_LED = 1000 mA)
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Doc ID 15327 Rev 2