SG3731N MICROSEMI, SG3731N Datasheet

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SG3731N

Manufacturer Part Number
SG3731N
Description
Manufacturer
MICROSEMI
Datasheet

Specifications of SG3731N

Lead Free Status / Rohs Status
Compliant
Rev 1.3a 3.19.2005
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
(714) 898-8121
Avenue
Garden
Microsemi Inc.
FAX: (714) 893-2570
Grove,
CA
92841

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SG3731N Summary of contents

Page 1

... 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 Microsemi Inc. 11861 Western Avenue Garden Grove, CA (714) 898-8121 FAX: (714) 893-2570 92841 ...

Page 2

ABSOLUTE MAXIMUM RATINGS Supply Voltage (±V ) ........................................................ 18V S Analog Inputs ....................................................................... V Digital Inputs (SHUTDOWN) .................... -V Output Driver Supply Voltage ( V O Source/Sink Output Current (continuous) .................... 200mA Source/Sink Output Current (peak, 500ns) .................. 400mA Note ...

Page 3

ELECTRICAL CHARACTERISTICS Parameter SHUTDOWN Section Logic Threshold SHUTDOWN HIGH Current SHUTDOWN LOW Current Output Drivers (Each Output) HIGH Output Voltage LOW Output Voltage Driver Risetime Driver Falltime Total Supply Current V Supply Current S V Supply Current O Note 3. ...

Page 4

APPLICATION INFORMATION the lower threshold causes Output B to switch to the HIGH state less than 8V then V can be obtained with resistors from greater than 8V use zeners. ...

Page 5

... J - PACKAGE SG1731J SG2731J SG3731J 16-PIN PLASTIC DIP SG2731N N - PACKAGE SG3731N N Package: RoHS / Pb-free 100% Matte Tin Lead Finish Note 1. All packages are viewed from the top. Note 2. Contact factory for flatpack and leadless chip carrier availability. Rev 1.3a Copyright 1999 The two-quadrant transfer function of the SG1731 is ideal for pulse width modulated audio power amplifiers ...

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