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AN2507 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN2507
Description  This application note explains the design of a FLASH LED driver using the STCF03 device
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2507 Datasheet(HTML) 9 Page - STMicroelectronics

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AN2507
Selection of external components
9/31
The procedure to activate the NTC-feature is described in Section 5.2.
b)
Versions with an internal reference voltage for the NTC. This version requires a
different connection between the RX and NTC resistors. See Figure 2 below or
Figure 1 version B.
Figure 2.
NTC connection for versions with internal voltage reference
Note:
Versions with internal reference voltage do not support the SHUTDOWN+NTC mode,
because the internal reference voltage is off in SHUTDOWN mode.
NTC
RX
To optional A/D converter
NTC thermistor
RX resistor
STCF03
Table 1.
Recommended components
Component
Manufacturer
Part number
Value
Size
CI
TDK
C1608X5R0J106M
10 µF
0603
CO
TDK
C1608X5R0J105M
1 µF
0603
L
TDK
VLF4012AT-4R7M1R1
4.7 µH
3.7 x 3.5 x 1.2 mm
NTC
Murata
NCP21WF104J03RA
100 k
Ω
0805
RFL
Tyco
RL73K1JR27JTD
0.27
Ω
0603
RTR
Rohm
MCR01MZPJ6R20
1.8
Ω
0402
RX
Rohm
MCR01MZPJ15K
15 k
Ω
0402
LED
Luxeon LED
LXCL-PW1



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