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UM0670 データシート(PDF) 22 Page - STMicroelectronics

部品番号 UM0670
部品情報  80 W offline LED driver with PFC
PDF  43 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0670 データシート(HTML) 22 Page - STMicroelectronics

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UM0670
Measurement
Doc ID 15327 Rev 2
22/43
Figure 18.
Output LED current for different LED voltage (ILED = 1000 mA)
9.2
Power MOSFET turn ON and OFF time
The power MOSFET turn ON and OFF time is shown in Figure 19. Turn ON time is
approximately 50 ns and turn OFF time is approximately 120 ns (OFF time is used in
Equation 13 in the appendix).
Figure 19.
Power MOSFET turn ON and OFF measurement
9.3
LED current ripple reduction
The output LED current ripple can be reduced by increasing the output capacitor size. For
example, inductor current ripple is 400 mA for the 100 nF / 450 V output capacitor, as shown
in Figure 20. Thanks to the larger 470 nF capacitor used on the STEVAL-ILL013V1, the
VLED v s. ILED for nominal LED current 1 A
0
200
400
600
800
1000
1200
63
84
103
122
LED voltage [V]
LED
current
[mA]
1 A
AM00405



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