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AN4460 Datasheet(PDF) 5 Page - STMicroelectronics

Part # AN4460
Description  The STEVAL-ILL057V1 demonstration board is a complete
PDF  54 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4460 Datasheet(HTML) 5 Page - STMicroelectronics

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DocID026129 Rev 1
5/54
AN4460
List of figures
54
List of figures
Figure 1.
Demonstration board diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2.
Power supply connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 3.
LED string connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4.
Schematic - LED channel 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 5.
SMED state evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 6.
SMED state evolution. Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 7.
Dimming channel relation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 8.
FW timeline evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 9.
Console screen during startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 10.
“?” command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 11.
“st” command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 12.
“pw” command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 13.
Console screen for “ti” command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 14.
Current regulation - 4 channels at 245 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 15.
Current regulation - the same channels, different current setup. . . . . . . . . . . . . . . . . . . . . 37
Figure 16.
Current regulation - the same channels, different dimming . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 17.
String efficiency based on different current levels - 3 LEDs for each string . . . . . . . . . . . . 38
Figure 18.
String efficiency based on different current levels - 6 LEDs for each string . . . . . . . . . . . . 39
Figure 19.
String efficiency based on different current levels - 10 LEDs each string. . . . . . . . . . . . . . 39
Figure 20.
Current regulation vs. VPW_LED: 3 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 21.
Current regulation vs. VPW_LED: 6 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 22.
Current regulation vs. VPW_LED: 10 LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 23.
MOSFET gate during short-circuit - 245 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 24.
MOSFET gate during short-circuit - 738 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 25.
MOSFET gate during short-circuit - 1.065 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 26.
Schematic - STLUX385A - top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 27.
Schematic - 4 channel LED driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 28.
Schematic power section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48



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