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AN2747 Datasheet(PDF) 25 Page - STMicroelectronics |
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AN2747 Datasheet(HTML) 25 Page - STMicroelectronics |
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25 / 44 page  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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