SG1731 Datasheet, PDF (1/5 Pages) Microsemi Corporation – DC MOTOR PULSE WIDTH MODULATOR

SG1731/SG2731/SG3731
DC MOTOR PULSE WIDTH MODULATOR
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 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.
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
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
LINFINITY Microelectronics Inc.
1
11861 Western Avenue ∞ Garden Grove, CA 92841
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