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AN2747 bảng dữ liệu(PDF) 25 Page - STMicroelectronics

tên linh kiện AN2747
Giải thích chi tiết về linh kiện  250 W HID metal halide electronic ballast
PDF  44 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN2747 bảng dữ liệu(HTML) 25 Page - STMicroelectronics

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AN2747
ST7LITE39 microcontroller
25/44
Figure 24.
Constant current control
Figure 25.
Rsense circuit
●
Pin 15-16: PA3-PA2 output PWM1 and PWM0. These signals are connected to two flip-
flops realized using U1 and U2. These flip-flops are used to obtain the drive signal for
the high side switches, see Figure 25. The set signal is obtained by PWM rising edge,
directly from the signal PWM1 and PWM0. This signal is generated at 40 kHz fixed
frequency. The reset signal is obtained by the output comparator U3. In this way it is
possible to generate a PWM signal for drivers with fixed frequency and controlled duty
cycle. Since the system works in continuous conduction mode to avoid instability in the
current control circuit, the maximum duty cycle is limited at 50%.



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