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AN2747 Fiches technique(PDF) 23 Page - STMicroelectronics

No de pièce AN2747
Description  250 W HID metal halide electronic ballast
PDF  44 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2747 Fiches technique(HTML) 23 Page - STMicroelectronics

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AN2747
ST7LITE39 microcontroller
23/44
●
Pin 3: reset pin
Figure 20.
Pin usage and reset circuit
●
Pin 4: ADC channel 0 analog input, to measure the main DC bus voltage (VBUS). A
resistor partition is used to obtain, starting from a +400 V of bus a maximum of 5 V,
compatible with the MCU voltage input, see Figure 23.
Figure 21.
Vbus measurement circuit
●
Pin 5: ADC analog input 1: not used
●
Pin 6: ADC analog input 2: This pin is used to measure the lamp voltage. In Figure 23
there are two nets. The first one is a partitioning circuit composed of resistors R118-
R114, the other one composed of R117-R116. The voltage across the capacitors C114
and C115 is used as input of U4a to obtain a signal compatible with the MCU input.



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