SG1731 Datasheet | Microsemi

DESCRIPTION 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 parators and dual ±100m A, ±22V totem pole drivers with mutation 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. FEATURES - - - - - - - ±3.5V to ±15V control supply ±2.5V to ±22V driver supply Dual 100m A source/sink output drivers 5KHz to 350KHz oscillator range High slew rate error amplifier Adjustable deadband operation Digital SHUTDOWN input HIGH RELIABILITY FEATURES - SG1731 - Available to MIL-STD-883 - LMI level “S” processing available BLOCK DIAGRAM 4/90 Rev 1.3 9/99 Copyright  1999 Western L IN F IN ITY ∞ Garden Grove, CA 92841 Avenue ∞ (714) 898-8121 FAX: (714) 893-2570 Microelectronics Inc. SG1731/SG2731/SG3731 ABSOLUTE MAXIMUM RATINGS (Note1) Supply Voltage (±VS) ±18V Analog Inputs ±VS Digital Inputs (SHUTDOWN) -VS-0.3V to -VS+18V Output Driver Supply Voltage (±VO) ±25V Source/Sink Output Current (continuous) 200m A Source/Sink Output Current (peak, 500ns) 400m A Note 1. Values...