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STCF07 Fiches technique(PDF) 21 Page - STMicroelectronics |
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STCF07 Fiches technique(HTML) 21 Page - STMicroelectronics |
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21 / 26 page ![]() 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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