SG1731J

直流电机脉宽调制器 DC MOTOR PULSE WIDTH MODULATOR

The SG1731 is a pulse width modulator circuit designed specifically for DC motor control. It provides a bi-directional pulse train output in response to the magnitude and polarity of an analog error signal input. The device is useful as the control element in motor-driven servo systems for precision positioning and speed control, as well as in audio modulators and amplifiers using carrier frequencies to 350 KHz. The circuit contains a triangle waveform oscillator, a wideband operational amplifier for error voltage generation, a summing/scaling network for level-shifting the triangle waveform, externally programmable PWM comparators and dual ±100mA, ±22V totem pole drivers with commutation diodes for full bridge output. A SHUTDOWN terminal forces the drivers into a floating high-impedance state when driven LOW. Supply voltage to the control circuitry and to the output drivers may be from either dual positive and negative supplies, or single-ended.

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*Features**

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±3.5V to ±15V control supply 

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±2.5V to ±22V driver supply 

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Dual 100mA source/sink output drivers 

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5KHz to 350KHz oscillator range 

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High slew rate error amplifier 

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Adjustable deadband operation 

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Digital SHUTDOWN input