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AN3372 Fiches technique(PDF) 23 Page - STMicroelectronics

No de pièce AN3372
Description  This note describes digital ballast for 70 W HID lamps
PDF  37 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3372 Fiches technique(HTML) 23 Page - STMicroelectronics

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AN3372
ST7 microcontroller application pin use
Doc ID 018625 Rev 1
23/37
In Figure 14 the circuit for Vlamp measurement is shown.
●
Pin 17: MCU analogue input PB3 (AIN3) used for lamp current measurement.
Figure 15.
Isense measurement circuit
The above circuit uses a current transformer to generate the feedback signal on the R32
resistor.
The turn ratio of the current transformer is designed to obtain a voltage signal compatible
with 5 V of MCU.
●
Pin 18: MCU analogue input PB4 (AIN4). This pin is used for Vin input mains
measurement.
●
Pin 19: not used
●
Pin 20: not used
●
Pin 21: not used
●
Pin 22: MCU PC0. Zero current detect for half bridge current.



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