SG2731N

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

The SG2731 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.

**Key Features**

• ±3.5V to ±15V control supply

• ±2.5V to ±22V driver supply

• Dual 100mA source/sink output drivers

• 5KHz to 350KHz oscillator range

• High slew rate error amplifier

• Adjustable deadband operation

• Digital SHUTDOWN input