SG1731 [MICROSEMI]
DC MOTOR PULSE WIDTH MODULATOR; 直流电机脉宽调制器
| 型号： | SG1731 |
| 厂家： | 
Microsemi |
| 描述： | DC MOTOR PULSE WIDTH MODULATOR |
| 文件： | 总5页 (文件大小：143K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SG1731/SG2731/SG3731
DC MOTOR PULSE WIDTH MODULATOR
FEATURES
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.
• ±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
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
HIGH RELIABILITY FEATURES
- SG1731
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.
♦ Available to MIL-STD-883
♦ LMI level “S” processing available
BLOCK DIAGRAM
4/90 Rev 1.3 9/99
LINFINITY
Microelectronics
Inc.
Copyright 1999
11861 Western Avenue
∞
Garden Grove, CA 92841
FAX: (714) 893-2570
1
(714) 898-8121
∞
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) .................... 200mA
Source/Sink Output Current (peak, 500ns) .................. 400mA
Output Driver Diode Current (continuous) .................... 200mA
Output Driver Diode Current (peak, 500ns) .................. 400mA
Operating Junction Temperature
Hermetic (J - Package) ............................................... 150°C
Plastic (N - Package) .................................................. 150°C
Storage Temperature Range............................ -65°C to 150°C
Lead Temperature (Soldering, 10 Seconds) .................. 300°C
Note 1. Values beyond which damage may occur.
THERMAL DATA
J Package:
Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers forθJC aremaximumsforthelimitingthermal
resistance of the package in a standard mounting configuration.
The θJA numbers are meant to be guidelines for the thermal
performance of the device/pc-board system. All of the above
assume no ambient airflow.
Thermal Resistance-Junction to Case, θJC .............. 30°C/W
Thermal Resistance-Junction to Ambient, θJA .......... 80°C/W
N Package:
Thermal Resistance-Junction to Case, θJC .............. 40°C/W
Thermal Resistance-Junction to Ambient, θJA ......... 65°C/W
RECOMMENDED OPERATING CONDITIONS (Note 2)
Supply Voltage Range (±VS)............................... ±3.5V to ±15V
Error Amp Common-Mode Range ............... -VS + 3V to VS - 3V
Output Driver Supply Voltage Range.................. ±2.5V to ±22V
Source/Sink Output Current (continuous) .................... 100mA
Source/Sink Output Current (peak, 500ns) .................. 200mA
Output Driver Diode Current (continuous) .................... 100mA
Output Driver Diode Current (peak, 500ns) .................. 200mA
Oscillator Frequency Range ........................... 10Hz to 350KHz
Oscillator Voltage (Peak-to-Peak) .............................1V to 10V
Oscillator Timing Capacitor (CT) ....................... 200pF to 2.5µF
Operating Ambient Temperature Range
SG1731 ........................................................ -55°C to 125°C
SG2731 ........................................................... -25°C to 85°C
SG3731 .............................................................. 0°C to 70°C
Note 2. Range over which the device is functional and parameter limits are guaranteed.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specfiications apply over the operating ambient temperatures for SG1731 with -55°C ≤ TA ≤ 125°C, SG2731 with
-25°C ≤ TA ≤ 85°C, SG3731 with 0°C ≤ TA ≤ 70°C, VS =±15V, and VO = ±22V. Low duty cycle pulse testing techniques are used which maintains junction
and case temperatures equal to the ambient temperature.)
SG1731/2731/3731
Min. Typ. Max.
Parameter
Test Conditions
Units
Oscillator Section
CT Charging Current
TA = 25°C
TA = TMIN to TMAX
VCM = ±5V
450 500 550
µA
µA
µA
400
600
-20
2V∆± Input Bias Current
CT = 1000pF, 2V∆± = ±5V,TA = 25°C
CT = 1000pF, 2V∆± = ±5V
22.5 25.0 27.5
10
KHz
%
Initial Oscillator Frequency
Temperature Stability (Note 3)
Error Amplifier Section (Note 5)
Input Offset Voltage
Input Bias Current
10
3
mV
µA
Input Offset Current
600
nA
Open Loop Voltage Gain
Output Voltage Swing
Common-Mode Rejection Ratio
Slew Rate (Notes 3 and 4)
Unity Gain Bandwidth (Notes 3 and 4)
RL = 2KΩ
RL = 2KΩ
70
±10
70
5
0.7
dB
V
dB
V/µs
MHz
TA = 25°C
TA = 25°C
10
1
PWM Comparators
Input Bias Current
±VT = ±3V
6
µA
4/90 Rev 1.3 9/99
LINFINITY
Microelectronics
Inc.
Copyright 1999
11861 Western Avenue
∞
Garden Grove, CA 92841
FAX: (714) 893-2570
2
(714) 898-8121
∞
SG1731/SG2731/SG3731
ELECTRICAL CHARACTERISTICS (continued)
SG1731/2731/3731
Units
Parameter
Test Conditions
Min. Typ. Max.
SHUTDOWN Section
Logic Threshold
-VS = -3.5V to -15V
VSHUTDOWN = -VS+2.4V
VSHUTDOWN = -VS
VS+0.8
VS+2.0
400
-1.0
V
µA
mA
SHUTDOWN HIGH Current
SHUTDOWN LOW Current
Output Drivers (Each Output)
HIGH Output Voltage
ISOURCE = 20mA
ISOURCE = 100mA
ISINK = 20mA
19.2
19.0
V
V
V
V
ns
ns
LOW Output Voltage
-19.2
-19.0
300
ISINK = 100mA
Driver Risetime
Driver Falltime
CL = 1000pF
CL = 1000pF
300
Total Supply Current
VS Supply Current
VO Supply Current
14
6
mA
mA
VSHUTDOWN = -VS + 0.8V
VSHUTDOWN = -VS + 0.8V
Note 5. VCM = ±12V.
Note 3. These parameters, although guaranteed, are not tested in production.
Note 4. Unity Gain Inverting 10KΩ Feedback Resistance.
APPLICATION INFORMATION
SUPPLY VOLTAGE
TheSG1731requiresasupplyvoltageforthecontrolcircuitry(VS)
and for the power output drivers (VO). Each supply may be either
balanced positive and negative with respect to ground, or single-
ended. The only restrictions are:
As a design aid, the solutions to Equation 1 over the
recommended range of TOSCand VOSCare given in graphic form in
Figure 1. The lower limit on TOSC is 1.85µs, corresponding to a
maximum frequency of 350 KHz. The maximum value of VOSC
,
(2V∆+) - (2V∆-), is 10V peak-to-peak for linear waveforms.
1. The voltage between +VS and -VS must be at least 7.0V; but
no more than 44V.
2. The voltage between +VO and -VO must be at least 5.0V; but
no more than 44V.
3. +VO must be at least 5V more positive than -VS. This
eliminates the combination of a single-ended positive control
supply with a single-ended negative driver supply.
SUBSTRATE CONNECTION
The substrate connection (Pin 10) must always be connected to
either -VS or -VO, whichever is more negative. The substrate must
also be well bypassed to ground with a high quality capacitor.
FIGURE 1 - SG1731 OSCILLATOR PERIOD VS. VOSC AND CT
OSCILLATOR
ERROR AMPLIFIER
The triangle oscillator consists of two voltage comparators, a set/
reset flip-flop, a bi-directional 500µA current source, and an
external timing capacitor CT. A positive reference voltage (2V∆+)
applied to Pin 2 determines the positive peak value of the triangle,
and a negative reference voltage (2V∆-) at Pin 7 sets the negative
peak value of the triangle waveform.
Since the value of the internal current source is fixed at a nominal
±500µA, the oscillator period is a function of the selected peak-
to-peak voltage excursion and the value of CT. The theoretical
expression for the oscillator period is:
The error amplifier of the SG1731 is a conventional internally-
compensated operational amplifier with low output impedance.
All of the usual feedback and frequency compensation
techniques may be use to control the closed-loop gain
characteristics. The control supply voltage ±VS will determine the
input common mode range and output voltage swing; both will
extend to within 3V of the VS supply.
PULSE WIDTH MODULATION
2CT dV
5 x 10-4
TOSC
=
(Eq.1)
Pulse width modulation occurs by comparing the triangle
waveform to a fixed upper (+VT) and lower (-VT) threshold
voltage. A crossing above the upper threshold causes
Output A to switch to the HIGH state, and a crossing below
where CT is the timing capacitor in Farads and dV is VOSC in Volts
peak-to-peak.
4/90 Rev 1.3 9/99
LINFINITY
Microelectronics
Inc.
Copyright 1999
11861 Western Avenue
∞
Garden Grove, CA 92841
FAX: (714) 893-2570
3
(714) 898-8121
∞
SG1731/SG2731/SG3731
APPLICATION INFORMATION (continued)
the lower threshold causes Output B to switch to the HIGH state.
If±VS is less than±8Vthen±VT canbeobtainedwithresistorsfrom
±VS. If ±VS is greater than ±8V use zeners.
Threshold crossings are generated by shifting the triangle
waveform up and down with the error voltage (Pin 5). A positive
error voltage will result in a pulse width modulated output at
Driver A (Pin 13). Similarly, a negative error voltage produces a
pulse train at Driver B (Pin 12). Figure 2 illustrates this process
for the case where V∆+ is greater than VT.
It is important to note that the triangle shifting circuit also
attenuates the waveform seen at CT by a factor of 2. This results
in a waveform at the PWM comparators with a positive peak of
V∆+ and a negative peak of V∆-, and must be taken into account
when selecting the values for +VT and -VT.
FIGURE 2 - PULSE WIDTH MODULATION WITH NO DEADBAND
APPLICATION CIRCUITS
FIGURE 3
FIGURE 4
In this simple battery-powered position servo, the control supply
and driver supply are both single-ended positive with respect to
ground.
A high torque position servo is obtained by buffering the output
drivers to obtain higher output current.
4/90 Rev 1.3 9/99
LINFINITY
Microelectronics
Inc.
Copyright 1999
11861 Western Avenue
∞
Garden Grove, CA 92841
FAX: (714) 893-2570
4
(714) 898-8121
∞
SG1731/SG2731/SG3731
APPLICATION CIRCUITS
FIGURE 5
FIGURE 6
Bi-directional speed control results when the feedback voltage
transducer is a tachometer.
The two-quadrant transfer function of the SG1731 is ideal for
pulse width modulated audio power amplifiers.
CONNECTION DIAGRAMS & ORDERING INFORMATION (See Note Below)
Ambient
Temperature Range
Package
Part No.
Connection Diagram
16-PIN CERAMIC DIP
J - PACKAGE
SG1731J/883B
SG1731J
SG2731J
-55°C to 125°C
-55°C to 125°C
-25°C to 85°C
0°C to 65°C
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
+VT
2V∆+
+VS
SHUTDOWN
+VO
N. I. INPUT
INV. INPUT
ERROR
CT
OUTPUT A
OUTPUT B
-VO
SG3731J
16-PIN PLASTIC DIP
N - PACKAGE
SG2731N
SG3731N
-25°C to 85°C
0°C to 65°C
SUBSTRATE
-VS
2V∆-
-VT
Note 1. All packages are viewed from the top.
Note 2. Contact factory for flatpack and leadless chip carrier availability.
4/90 Rev 1.3 9/99
LINFINITY
Microelectronics
Inc.
Copyright 1999
11861 Western Avenue
∞
Garden Grove, CA 92841
FAX: (714) 893-2570
5
(714) 898-8121
∞
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