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AN2640 Datasheet(PDF) 12 Page - STMicroelectronics

Part # AN2640
Description  Intelligent multipower digital ballast for fluorescent lamps
PDF  36 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2640 Datasheet(HTML) 12 Page - STMicroelectronics

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ST7LIT19BF1 - 8-bit MCU
AN2640
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Figure 10.
PFC overcurrent detection circuit
●
Pin 5: AIN1 - PFC Vout sense. This pin is used to perform the PFC Vout voltage
protection and regulation. Figure 11 shows the circuit for the PFC Vout sense.
Figure 11.
PFC Vout sense circuit
In this pin the MCU reads the voltage on the C6 capacitor and converts this value to a
digital one which is proportional to the DC bus voltage.
●
Pin 6: AIN2 - PFC Vin waveform. The circuitry shown in Figure 12 measures the input
voltage and the voltage across R5-C4 is used by the MCU to understand the
instantaneous main voltage.



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