SG1731J/DESC [MICROSEMI]
Brush DC Motor Controller;
| 型号： | SG1731J/DESC |
| 厂家： | 
Microsemi |
| 描述： | Brush DC Motor Controller 电动机控制 驱动 CD |
| 文件： | 总8页 (文件大小：429K) |
| 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
Description
Features
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.
. ±3.5 V to ±15 V Control Supply
. ±2.5 V to ±22 V Driver Supply
.
Dual 100 mA Source/Sink Output Drivers
. 5 kHz to 350 kHz 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 ±100 mA, ±22 V
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.
High Reliability Features
. Available to MIL-STD-883
. Available to DSCC
– Standard Microcircuit Drawing (SMD)
. MSC-AMS level “S” Processing Available
Block Diagram
500
Figure 1 · Block Diagram
www.microsemi.com
May 2015 Rev. 1.4
1
© 2015 Microsemi Corporation
Absolute Maximum Ratings (Note 1)
Supply Voltage (±VS) ........................................................ ±18 V
Output Driver Diode Current (continuous) .................... 200 mA
Analog Inputs ......................................................................... ±VS Output Driver Diode Current (peak, 500 ns) ................. 400 mA
Digital Inputs (SHUTDOWN) ................... -VS-0.3 V to -VS+18 V
Output Driver Supply Voltage (±VO) ................................. ±25 V
Source/Sink Output Current (continuous) .................... 200 mA
Source/Sink Output Current (peak, 500 ns) ................. 400 mA
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
RoHS Peak Package Solder Reflow Temp.(40 sec. max. exp.)...... 260°C (+0, -5)
Values beyond which damage may occur. Extended operation
at the maximum levels may degrade performance and affect
reliability.
Note 1.
Thermal Data
J Package:
Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers for θJC are maximums for the limiting
thermal 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
L Package:
Thermal Resistance-Junction to Case, θJC ................. 35°C/W
Thermal Resistance-Junction to Ambient, θJA .......... 120°C/W
Recommended Operating Conditions (Note 2)
Supply Voltage Range (±VS)................................ ±3.5 V to ±15 V Oscillator Frequency Range .......................... 10 Hz to 350 kHz
Error Amp Common-Mode Range ................ -VS + 3 V to VS - 3 V Oscillator Voltage (Peak-to-Peak) ............................1 V to 10 V
Output Driver Supply Voltage Range................... ±2.5 V to ±22 V Oscillator Timing Capacitor (CT) ...................... 200 pF to 2.5 µF
Source/Sink Output Current (continuous) ...................... 100 mA Operating Ambient Temperature Range
Source/Sink Output Current (peak, 500 ns) ................... 200 mA
Output Driver Diode Current (continuous) ...................... 100 mA
Output Driver Diode Current (peak, 500 ns) ................... 200 mA
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 = ±15 V, and VO = ±22 V. 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
TA = 25°C
TA = TMIN to TMAX
VCM = ±5 V
CT = 1000 pF, 2V∆± = ±5 V,TA = 25°C
CT = 1000 pF, 2V∆± = ±5 V
CT Charging Current
450 500 550
µA
µA
µA
kHz
%
400
600
-20
2V∆± Input Bias Current
Initial Oscillator Frequency
Temperature Stability (Note 3)
22.5 25.0 27.5
10
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)
70
±10
70
5
0.7
dB
V
dB
V/µs
MHz
RL = 2 kΩ
RL = 2 kΩ
TA = 25°C
TA = 25°C
10
1
PWM Comparators
Input Bias Current
±VT= ±3 V
6
µA
2
Electrical Characteristics (Continued)
SG1731/2731/3731
Min. Typ. Max.
Units
Parameter
Test Conditions
SHUTDOWN Section
Logic Threshold
-VS = -3.5 V to -15 V
VSHUTDOWN = -VS+2.4 V
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 = 20 mA
ISOURCE = 100 mA
ISINK = 20 mA
ISINK = 100 mA
19.2
19.0
V
V
V
V
ns
ns
LOW Output Voltage
-19.2
-19.0
300
Driver Risetime
Driver Falltime
CL
CL
= 1000 pF
= 1000 pF
300
Total Supply Current
VS Supply Current
VO Supply Current
VSHUTDOWN = -VS + 0.8 V
VSHUTDOWN = -VS + 0.8 V
14
6
mA
mA
Note 5. VCM = ±12 V.
Note 3. These parameters, although guaranteed, are not tested in production.
Note 4. Unity Gain Inverting 10 kΩ Feedback Resistance.
Application Information
SUPPLY VOLTAGE
As
a design aid, the solutions to Equation 1 over
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:
the recommended range of TOSC and VOSC are given in graphic
form in Figure 1. The lower limit on TOSC is 1.85 µs,
corresponding to a maximum frequency of 350 kHz. The
maximum value of VOSC, (2V∆+) - (2V∆-), is 10 V peak-to-peak
for linear waveforms.
The voltage between +V and -V must be at least 7.0 V; but
1.
2.
3.
S
S
no more than 44 V.
The voltage between +V and -V must be at least 5.0 V; but
O
O
no more than 44 V.
+V must be at least 5 V more positive than -VS. This
O
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.
1 ms 2 ms
5 ms 10 ms 20 ms
OSCILLATOR
Figure 2 · SG1731 Oscillator Period VS. VOSC and CT
ERROR AMPLIFIER
The triangle oscillator consists of two voltage comparators, a
set/reset flip-flop, a bi-directional 500 µA 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 ±500 µA, 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 3 V of the VS supply.
PULSE WIDTH MODULATION
2CT dV
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
5 x 10-4
where CT is the timing capacitor in Farads and dV is VOSC in Volts
peak-to-peak.
3
Application Information (Continued)
the lower threshold causes Output B to switch to the HIGH state.
If ±VS is less than ±8 V then ±VT can be obtained with resistors
from ±VS. If ±VS is greater than ±8 V 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 3 - Pulse Width Modulation with No Deadband
Application Circuits
+15 V
+22 V
9 V
15 V
22 V
+10 V
10 V
Figure 4
Figure 5
A high torque position servo is obtained by buffering the output
drivers to obtain higher output current.
In this simple battery-powered position servo, the control supply
and driver supply are both single-ended positive with respect to
ground.
4
Application Circuits (Continued)
+10 V
+15 V
200 pF
+40 V
+22 V
10 V
15 V
22 V
22 V
Figure 6
Figure 7
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 Notes Below)
Ambient
Temperature Range
Part No.
Connection Diagram
Package
16-PIN CERAMIC DIP
J - PACKAGE
SG1731J- 883B
SG1731J-DESC
SG1731J
-55°C to 125°C
-55°C to 125°C
-55°C to 125°C
+VS
+VT
2V∆+
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SHUTDOWN
+VO
N. I. INPUT
INV. INPUT
ERROR
CT
OUTPUT A
OUTPUT B
-VO
SUBSTRATE
-VS
2V∆-
-VT
16-PIN PLASTIC DIP
N - PACKAGE
-25°C to 85°C
0°C to 70°C
SG2731N
SG3731N
N Package: RoHS Compliant / Pb-free Transition DC: 0503
N Package: RoHS / Pb-free 100% Matte Tin Lead Finish
20-PIN CERAMIC
LEADLESS CHIP CARRIER
L- PACKAGE
SG1731L
SG1731L- 883B
-55°C to 125°C
-55°C to 125°C
NC
-V
NC
+V
11
12
1
3
2
1
20 19
S
T
2
3
4
5
SUBSTRATE
-V
13
14
2V
Δ+
4
5
6
18
O
N. I. INPUT
INV. INPUT
17
16
OUTPUT B
NC
OUTPUT A
15
16
17
NC
ERROR
6
7
7
8
15
14
+V
O
18
19
C
T
8
9
SHUTDOWN
+V
2V
Δ-
S
20
9
10 11 12 13
-V
T
10
Note 1. All packages are viewed from the top.
Note 2. Contact factory for leadless chip carrier availability.
Note 3. Hermetic Packages J, L use Sn63/Pb37 hot solder lead finish, Contact factory for availability of RoHS versions.
5
Package Outline Dimensions
Controlling dimensions are in inches, metric equivalents are shown for general information.
MILLIMETERS
INCHES
MAX
DIM
MIN
-
MAX
5.08
0.51
1.65
0.38
19.94
7.11
MIN
-
A
b
0.200
0.020
0.065
0.015
0.785
0.280
0.38
1.04
0.20
19.30
5.59
0.015
0.045
0.008
0.760
0.220
D
b2
c
9
8
16
D
E
E
1
e
2.54 BSC
0.100 BSC
eA
b2
eA
H
L
7.37
0.63
3.18
-
7.87
1.78
5.08
15°
0.290
0.025
0.125
-
0.310
0.070
0.200
15°
A
Seating Plane
L
α
θ
H
b
Q
0.51
1.02
0.020
0.040
e
Note:
Dimensions do not include protrusions; these shall
not exceed 0.155mm (.006”) on any side. Lead
dimension shall not include solder coverage.
Figure 8 · J 16-Pin Ceramic Dual Inline Package Dimensions
MILLIMETERS
INCHES
MAX
DIM
MIN
-
MAX
5.33
-
MIN
-
A
A1
A2
b
0.210
-
D
0.38
0.015
3.30 Typ.
0.130 Typ.
E1
0.36
1.14
0.56
1.78
0.014
0.045
0.008
0.735
0.022
0.070
0.014
0.775
1
b1
c
b1
0.20
0.36
E
D
18.67
19.69
e
2.54 BSC
0.100 BSC
A2
A
E
7.62
6.10
2.92
-
8.26
7.11
0.381
15°
0.300
0.240
0.115
-
0.325
0.280
0.150
15°
c
A1
E1
L
L
e
S
EATING PLANE
θ
θ
b
Note:
Dimensions do not include protrusions; these shall
not exceed 0.155mm (.006”) on any side. Lead
dimension shall not include solder coverage.
Figure 9 · N 16-Pin Plastic Dual Inline Package Dimensions
6
Package Outline Dimensions (Continued)
E3
D
MILLIMETERS
INCHES
DIM
MIN
8.64
-
MAX
9.14
MIN
MAX
0.360
0.320
D/E
E3
e
0.340
-
8.128
E
1.270 BSC
0.635 TYP
0.050 BSC
0.025 TYP
B1
L
1.02
1.52
0.040
0.060
0.090
A
1.626
2.286
0.064
h
1.016 TYP
0.040 TYP
A
L2
L
8
A1
A1
A2
L2
B3
1.372
-
1.68
1.168
2.41
0.054
-
0.066
0.046
0.95
3
1
1.91
0.075
0.203R
0.008R
Note:
All exposed metalized area shall be gold plated
60 micro-inch minimum thickness over nickel
plated unless otherwise specified in purchase
order.
13
h
18
A2
B3
e
B1
Figure 10 · L 20-Pin Ceramic LCC Package Outline Dimensions
7
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and system solutions for communications, defense & security, aerospace and industrial
markets. Products include high-performance and radiation-hardened analog mixed-signal
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SG1731-1.4/05.15
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