SG2731 Microsemi Corporation, SG2731 Datasheet

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SG2731

Manufacturer Part Number
SG2731
Description
Dc Motor Pulse Width Modulator
Manufacturer
Microsemi Corporation
Datasheet

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Part Number:
SG2731N
Manufacturer:
LT
Quantity:
5 510
Part Number:
SG2731N
Quantity:
5 510
4/90 Rev 1.3 9/99
Copyright
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,
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.
BLOCK DIAGRAM
22V
1999
totem pole drivers with commutation diodes for full bridge output.
DC MOTOR PULSE WIDTH MODULATOR
1
A
SG1731/SG2731/SG3731
FEATURES
HIGH RELIABILITY FEATURES
Dual 100mA source/sink output
drivers
5KHz to 350KHz oscillator range
High slew rate error amplifier
Adjustable deadband operation
Digital SHUTDOWN input
Available to MIL-STD-883
LMI level “S” processing available
3.5V to 15V control supply
2.5V to 22V driver supply
- SG1731
11861
Western
L
(714) 898-8121
INFINITY
Avenue
Garden
Microelectronics
FAX: (714) 893-2570
Grove,
CA
92841
Inc.

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SG2731 Summary of contents

Page 1

... BLOCK DIAGRAM 4/90 Rev 1.3 9/99 Copyright 1999 DC MOTOR PULSE WIDTH MODULATOR A 1 SG1731/SG2731/SG3731 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 ...

Page 2

... Oscillator Voltage (Peak-to-Peak) ............................. 1V to 10V S S Oscillator Timing Capacitor (C Operating Ambient Temperature Range SG1731 ........................................................ - 125 C SG2731 ........................................................... - SG3731 .............................................................. 15V, and V = 22V. Low duty cycle pulse testing techniques are used which maintains junction S O Test Conditions ...

Page 3

... V . The theoretical T PULSE WIDTH MODULATION (Eq.1) Pulse width modulation occurs by comparing the triangle waveform to a fixed upper (+V in Volts voltage. OSC Output A to switch to the HIGH state, and a crossing below 3 SG1731/SG2731/SG3731 SG1731/2731/3731 Min. Typ. Max. V +0.8 S 19.2 19.0 Note 12V. CM and V ...

Page 4

... Rev 1.3 9/99 Copyright 1999 (continued factor of 2. This results . T A high torque position servo is obtained by buffering the output drivers to obtain higher output current. 4 SG1731/SG2731/SG3731 FIGURE 2 - PULSE WIDTH MODULATION WITH NO DEADBAND FIGURE 4 L INFINITY 11861 Western Avenue (714) 898-8121 Microelectronics Inc. Garden ...

Page 5

... The two-quadrant transfer function of the SG1731 is ideal for pulse width modulated audio power amplifiers. (See Note Below) Ambient Connection Diagram Temperature Range - 125 C - 125 SG1731/SG2731/SG3731 FIGURE SHUTDOWN + N ...

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