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STCF07PNR データシート(PDF) 21 Page - STMicroelectronics

部品番号 STCF07PNR
部品情報  High power buck-boost white LED driver
PDF  26 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STCF07PNR データシート(HTML) 21 Page - STMicroelectronics

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STCF07
External component selection
Doc ID 16757 Rev 3
21/26
11.5
RLC selection
RLC resistor value can be calculated with the following equations:
RLC = (160 mV - ILC * RHC) / ILC and PRLC = RLC * ILC
2
where PRLC is the dissipated power on the RLC resistor. It is recommended to use a thin
metal film resistor with a 1% or 5% tolerance.
11.6
NTC and RX resistor selection
The NTC resistor for sensing LED temperature and the RX resistor create a voltage divider.
The output of this divider is compared with the 1.192 V internal voltage reference. When
voltage on the output of the voltage divider is increased over the reference, the logic
switches off the power circuit. Voltage divider is possible to supply from the NTC pin, where
is output of the 1.8 V internal reference.



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