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UM0670 Fiches technique(PDF) 21 Page - STMicroelectronics

No de pièce UM0670
Description  80 W offline LED driver with PFC
PDF  43 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0670 Fiches technique(HTML) 21 Page - STMicroelectronics

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Measurement
UM0670
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Doc ID 15327 Rev 2
Figure 16.
Output LED current for different LED voltage (ILED = 700 mA)
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 (ILED = 1000 mA)
AM00404
VLED v s. ILED for nominal LED current 700 mA
0
100
200
300
400
500
600
700
800
82
101
121
139
LED voltage [V]
LED
current
[mA]
700 mA



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