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UM0670 Datasheet(PDF) 20 Page - STMicroelectronics

Part # UM0670
Description  80 W offline LED driver with PFC
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0670 Datasheet(HTML) 20 Page - STMicroelectronics

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UM0670
Measurement
Doc ID 15327 Rev 2
20/43
Figure 14.
Output LED current for different LED voltages (ILED = 350 mA)
Figure 15 shows the output LED current waveform for the LED current of 700 mA. The
current ripple is, in this case, 333 mA and the switching frequency for the modified buck
converter is 69 kHz. The input voltage was 230 AC and 6 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 16.
Figure 15.
Output LED current waveforms (ILED = 700 mA)
VLED v s. ILED for nominal LED current 350 mA
0
50
100
150
200
250
300
350
400
450
174
193
211
230
250
LED voltage [V]
LED
current
[mA]
350 mA
AM00399



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