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DRV8871EVM 产品设计参考手册 - TI（德州仪器）
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TI（德州仪器）
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开发套件
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TEXAS INSTRUMENTS DRV8871EVM 评估电路板, 无刷直流电机驱动器
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DRV8871EVM数据手册
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Introduction
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Figure 9. IN2 Connected to PWM Output Figure 10. IN2 Floating, can be Controlled Externally
1.4 Duty Cycle Potentiometer (R3)
The duty cycle potentiometer “PWM DUTY CYCLE” is found in Figure 11. The potentiometer adjusts the
duty cycle of the PWM signal which will adjust the speed of the motor. To lower the duty cycle, turn the
potentiometer counter-clockwise. To increase the duty cycle, turn the potentiometer clockwise.
Figure 11. PWM Duty Cycle
The onboard PWM signal for the DRV8871 is generated by a circuit based upon the Texas Instruments'
TLC555 low-power timer. It is capable of an approximately 25-kHz output that can be adjusted from 5% to
95% duty cycle. This square output signal will switch from 0 V to V5P0.
4
DRV8871 Evaluation Module SLVUAJ4–August 2015
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