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ST72734 数据表(PDF) 117 Page - STMicroelectronics |
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ST72734 数据表(HTML) 117 Page - STMicroelectronics |
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117 / 144 page  ST72774/ST727754/ST72734 117/144 PWM/BRM Outputs (Cont’d) PWM/BRM Outputs The PWM/BRM outputs are assigned to dedicated pins. The RC filter time must be higher than TCPUx64. Figure 70. Typical PWM Output Filter Table 27. 6-Bit PWM Ripple After Filtering With RC filter (R=1K Ω), fCPU = 8 MHz VDD = 5V PWM Duty Cycle 50% R=Rext. Figure 71. PWM Simplified Voltage Output After Filtering Cext OUTPUT VOLTAGE STAGE OUTPUT Rext Cext (µF) V RIPPLE (mV) 0.128 78 1.28 7.8 12.8 0.78 V DD 0V 0V DD V Vripple (mV) V OUTAVG "CHARGE" "DISCHARGE" "CHARGE" "DISCHARGE" 0V V V 0V OUTAVG V (mV) ripple V VR01956 "CHARGE" "DISCHARGE" "CHARGE" "DISCHARGE" PWMOUT DD DD PWMOUT OUTPUT VOLTAGE OUTPUT VOLTAGE |
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