UC1637_17 [TI]
Switched Mode Controller for DC Motor Drive;
| 型号： | UC1637_17 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Switched Mode Controller for DC Motor Drive |
| 文件： | 总9页 (文件大小：357K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UC1637
UC2637
UC3637
Switched Mode Controller for DC Motor Drive
FEATURES
DESCRIPTION
•
•
•
Single or Dual Supply
Operation
The UC1637 is a pulse width modulator circuit intended to be used for a variety of
PWM motor drive and amplifier applications requiring either uni-directional or bi-
directional drive circuits. When used to replace conventional drivers, this circuit
can increase efficiency and reduce component costs for many applications. All
necessary circuitry is included to generate an analog error signal and modulate
two bi-directional pulse train outputs in proportion to the error signal magnitude
and polarity.
±
±
2.5V to 20V Input Supply
Range
±
5% Initial Oscillator
±
Accuracy; 10% Over
Temperature
This monolithic device contains a sawtooth oscillator, error amplifier, and two
•
Pulse-by-Pulse Current
Limiting
±
PWM comparators with 100mA output stages as standard features. Protection
circuitry includes under-voltage lockout, pulse-by-pulse current limiting, and a
shutdown port with a 2.5V temperature compensated threshold.
•
•
Under-Voltage Lockout
The UC1637 is characterized for operation over the full military temperature range
of -55°C to +125°C, while the UC2637 and UC3637 are characterized for -25°C to
+85°C and 0°C to +70°C, respectively.
Shutdown Input with
Temperature Compensated
2.5V Threshold
•
•
Uncommitted PWM
Comparators for Design
Flexibility
ABSOLUTE MAXIMUM RATINGS (Note 1)
±
±
Supply Voltage ( Vs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Output Current, Source/Sink (Pins 4, 7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA
±
Analog Inputs (Pins 1, 2, 3, 8, 9, 10, 11 12, 13, 14, 15, 16) . . . . . . . . . . . . . . . . . . . . . . . Vs
Error Amplifier Output Current (Pin 17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Dual 100mA, Source/Sink
Output Drivers
±
Oscillator Charging Current (Pin 18). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2mA
Power Dissipation at TA = 25°C (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW
Power Dissipation at TC = 25°C (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000mW
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C
Note 1: Currents are positive into, negative out of the specified terminal.
Note 2: Consult Packaging Section of Databook for thermal limitations and considerations
of package.
BLOCK DIAGRAM
6/97
UC1637
UC2637
UC3637
CONNECTION DIAGRAM
PLCC-20, LCC-20
(TOP VIEW)
Q, L Packages
DIL-18 (TOP VIEW)
J or N Package
PACKAGE PIN
FUNCTION
FUNCTION
PIN
1
2
+VTH
CT
-VTH
AOUT
-VS
3
4
5
N/C
6
+VS
BOUT
+BIN
-BIN
-AIN
+AIN
+C/L
-C/L
7
8
9
10
11
12
13
14
SOIC-20 (TOP VIEW)
DW Package
SHUTDOWN 15
N/C
+E/A
-E/A
16
17
18
E/A OUTPUT 19
20
ISET
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = -55°C to +125°C for the
UC1637; -25°C to +85°C for the UC2637; and 0°C to +70°C for the UC3637; +VS =
+15V, -VS = - 15V, +VTH = 5V, -VTH = -5V, RT = 16.7kΩ, CT = 1500pF, TA=TJ.
PARAMETER
Oscillator
TEST CONDITIONS
UC1637/UC2637
UC3637
TYP
UNITS
MIN
TYP
MAX
MIN
MAX
Initial Accuracy
Voltage Stability
TJ = 25°C (Note 6)
9.4
10
5
10.6
7
9
10
5
11
7
kHz
%
±
±
VS = 5V to 20V, VPIN 1 = 3V,
VPIN 3 = -3V
Temperature Stability
+VTH Input Bias Current
-VTH Input Bias Current
+VTH, -VTH Input Range
Error Amplifier
Over Operating Range (Note 3)
VPIN 2 = 6V
0.5
0.1
2
0.5
0.1
2
%
µA
µA
V
-10
-10
10
-10
-10
10
VPIN 2 = 0V
-0.5
-0.5
+VS-2
-VS+2 +VS-2
-VS+2
Input Offset Voltage
Input Bias Current
Input Offset Current
Common Mode Range
Open Loop Voltage Gain
Slew Rate
VCM = 0V
VCM = 0V
VCM = 0V
1.5
0.5
0.1
5
1.5
0.5
0.1
10
5
mV
µA
5
1
1
µA
±
VS = 2.5 to 20V
-VS+2
75
+VS -VS+2
80
+VS
V
RL = 10k
100
15
100
15
dB
V/µS
MHz
dB
Unity Gain Bandwidth
CMRR
2
2
Over Common Mode Range
75
75
100
110
75
75
100
110
±
±
PSRR
VS = 2.5 to 20V
dB
2
UC1637
UC2637
UC3637
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications apply for TA = -55°C to +125°C for the
UC1637; -25°C to +85°C for the UC2637; and 0°C to +70°C for the UC3637: VS =
+15V, -VS = - 15V, +VTH = 5V, -VTH = -5V, RT = 16.7kΩ, CT = 1500pF, TA=TJ.
PARAMETERS
TEST CONDITIONS
UC1637/UC2637
UC3637
TYP
UNITS
MIN
TYP
MAX
MIN
MAX
Error Amplifier (Continued)
Output Sink Current
Output Source Current
High Level Output Voltage
Low Level Output Voltage
PWM Comparators
Input Offset Voltage
Input Bias Current
Input Hysteresis
VPIN 17 = 0V
VPIN 17 = 0V
-50
11
-20
-13
10
-50
11
-20
mA
mA
V
5
5
13
13.6
-14.8
13
13.6
-14.8
-13
V
VCM = 0V
VCM = 0V
VCM = 0V
20
2
20
2
mV
µA
mV
V
10
+VS-2
220
10
10
±
±
Common Mode range
Current Limit
VS = 5V to 20V
-VS+1
190
+VS-2 -VS+1
Input Offset Voltage
Input Offset Voltage T.C.
Input Bias Current
Common Mode Range
Shutdown
VCM = 0V, TJ = 25°C
200
-0.2
-1.5
210
180
200
-0.2
-1.5
mV
mV/°C
µA
-10
-VS
-10
-VS
VS = ±2.5V to ±20V
(Note 4)
+VS-3
-2.7
+VS-3
-2.7
V
Shutdown Threshold
Hysteresis
-2.3
-10
-2.5
40
-2.3
-10
-2.5
40
V
mV
µA
Input Bias Current
Under-Voltage Lockout
Start Threshold
VPIN 14 = +VS to -VS
(Note 5)
-0.5
-0.5
4.15
0.25
5.0
15
4.15
0.25
5.0
15
V
Hysteresis
mV
Total Standby Current
Supply Current
8.5
8.5
mA
V
Output Section
Output Low Level
ISINK = 20mA
-14.9
-14.5
13.5
13.5
100
-13
-13
-14.9
-14.5
13.5
13.5
100
-13
-13
ISINK = 100mA
Output High Level
ISOURCE = 20mA
13
12
13
12
V
ISOURCE = 100mA
(Note 3) CL = Inf, TJ = 25°C
(Note 3) CL = Inf, TJ = 25°C
Rise Time
Fall Time
600
300
600
300
ns
ns
100
100
Note 3: These parameters, although guaranteed over the recommended operating conditions, are not 100% tested in production.
Note 4: Parameter measured with respect to +VS (Pin 6).
Note 5: Parameter measured at +VS (Pin 6) with respect to -VS (Pin 5).
Note 6: RT and CT referenced to Ground.
FUNCTIONAL DESCRIPTION
Following is a description of each of the functional blocks minal voltage is buffered internally and also applied to the
shown in the Block Diagram.
lSET terminal to develop the capacitor charging current
through RT. If RT is referenced to -VS as shown in Figure
1, both the threshold voltage and charging current will
vary proportionally to the supply differential, and the oscil-
lator frequency will remain constant. The triangle wave-
form oscillators frequency and voltage amplitude is
determined by the external components using the formulas
given in Figure 1.
Oscillator
The oscillator consists of two comparators, a charging
and discharging current source, a current source set ter-
minal, lSET and a flip-flop. The upper and lower threshold
of the oscillator waveform is set externally by applying a
voltage at pins +VTH and -VTH respectively. The +VTH ter-
3
UC1637
UC2637
UC3637
Figure 1. Oscillator Setup
PWM Comparators
Two comparators are provided to perform pulse width
modulation for each of the output drivers. Inputs are un-
committed to allow maximum flexibility. The pulse width of
the outputs A and B is a function of the sign and ampli-
tude of the error signal. A negative signal at Pin 10 and 8
will lengthen the high state of output A and shorten the
high state of output B. Likewise, a positive error signal re-
verses the procedure. Typically, the oscillator waveform is
compared against the summation of the error signal and
the level set on Pin 9 and 11.
Figure 2. Comparator Biasing
MODULATION SCHEMES
Case A Zero Deadtime (Equal voltage on Pin 9 and Pin 11)
In this configuration, maximum holding torque or stiffness
and position accuracy is achieved. However, the power in-
put into the motor is increased. Figure 3A shows this con-
figuration.
Output Drivers
Each output driver is capable of both sourcing and sinking
100mA steady state and up to 500mA on a pulsed basis
for rapid switching of either POWERFET or bipolar tran-
sistors. Output levels are typically -VS + 0.2V @50mA low
level and +VS - 2.0V @50mA high level.
Case B Small Deadtime (Voltage on Pin 9 > Pin 11)
A small differential voltage between Pin 9 and 11 provides
the necessary time delay to reduce the chances of mo-
mentary short circuit in the output stage during transi-
tions, especially where power-amplifiers are used. Refer to
Figure 3B.
Error Amplifier
The error amplifier consists of a high slew rate (15V/µs)
op-amp with a typical 1MHz bandwidth and low output im-
pedance. Depending on the VS supply voltage, the com-
mon mode input range and the voltage output swing is
within 2V of the VS supply.
±
Case C Increased Deadtime and Deadband Mode
(Voltage on Pin 9 > Pin 11)
Under-Voltage Lockout
With the reduction of stiffness and position accuracy, the
power input into the motor around the null point of the
servo loop can be reduced or eliminated by widening the
window of the comparator circuit to a degree of accep-
tance. Where position accuracy and mechanical stiffness
is unimportant, deadband operation can be used. This is
shown in Figure 3C.
An under-voltage lockout circuit holds the outputs in the
low state until a minimum of 4V is reached. At this point,
all internal circuitry is functional and the output drivers are
enabled. If external circuitry requires a higher starting volt-
age, an over-riding voltage can be programmed through
the shutdown terminal as shown in Figure 4.
4
UC1637
UC2637
UC3637
Figure 3. Modulation Schemes Showing (A) Zero Deadtime (B) Deadtime and (C) Deadband Configurations
Shutdown Comparator
The shutdown terminal may be used for implementing
various shutdown and protection schemes. By pulling the
terminal more than 2.5V below VIN, the output drivers will
be enabled. This can be realized using an open collector
gate or NPN transistor biased to either ground or the
negative supply. Since the threshold is temperature stabi-
lized, the comparator can be used as an accurate low
voltage lockout (Figure 4) and/or delayed start as in Fig-
ure 5. In the shutdown mode the outputs are held in the
low state.
Figure 5. Delayed Start-Up
-VS to within 3V of the +VS supply while providing excel-
lent noise rejection. Figure 6 shows a typical current
sense circuit.
Figure 4. External Under-Voltage Lockout
Current Limit
A latched current limit amplifier with an internal 200mV
offset is provided to allow pulse-by-pulse current limiting.
Differential inputs will accept common mode signals from
Figure 6. Current Limit Sensing
5
UC1637
UC2637
UC3637
Figure 7. Bi-Directional Motor Drive with Speed Control Power-Amplifier
Figure 8. Single Supply Position Servo Motor Drive
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
6
PACKAGE OPTION ADDENDUM
www.ti.com
17-Nov-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
LCCC
CDIP
CDIP
CDIP
LCCC
LCCC
SOIC
Drawing
5962-89957012A
5962-8995701VA
UC1637J
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
FK
J
20
18
18
18
20
20
20
1
1
1
1
1
1
TBD
TBD
TBD
TBD
TBD
TBD
POST-PLATE Level-NC-NC-NC
A42 SNPB
A42 SNPB
A42 SNPB
Level-NC-NC-NC
Level-NC-NC-NC
Level-NC-NC-NC
J
UC1637J883B
UC1637L
J
FK
FK
DW
POST-PLATE Level-NC-NC-NC
POST-PLATE Level-NC-NC-NC
UC1637L883B
UC2637DW
25 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
UC2637DWG4
UC2637DWTR
ACTIVE
ACTIVE
SOIC
SOIC
DW
DW
20
20
25 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
UC2637J
UC2637N
ACTIVE
ACTIVE
CDIP
PDIP
J
18
18
1
TBD
A42 SNPB
Level-NC-NC-NC
N
20 Green (RoHS & CU NIPDAU Level-NC-NC-NC
no Sb/Br)
UC2637NG4
UC2637Q
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
PDIP
PLCC
PLCC
SOIC
SOIC
SOIC
N
18
20
20
20
20
20
20 Green (RoHS & CU NIPDAU Level-NC-NC-NC
no Sb/Br)
FN
46 Green (RoHS &
no Sb/Br)
CU SN
Level-2-260C-1 YEAR
UC2637QTR
UC3637DW
FN
1000 Green (RoHS &
no Sb/Br)
CU SN
Level-2-260C-1 YEAR
DW
DW
DW
25 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
UC3637DWTR
UC3637DWTRG4
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2000 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
UC3637J
UC3637N
ACTIVE
ACTIVE
CDIP
PDIP
J
18
18
1
TBD
A42 SNPB
Level-NC-NC-NC
N
20 Green (RoHS & CU NIPDAU Level-NC-NC-NC
no Sb/Br)
UC3637NG4
UC3637Q
ACTIVE
ACTIVE
PDIP
N
18
20
20 Green (RoHS & CU NIPDAU Level-NC-NC-NC
no Sb/Br)
PLCC
FN
46 Green (RoHS &
no Sb/Br)
CU SN
Level-2-260C-1 YEAR
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan
-
The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS
&
no Sb/Br)
-
please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
17-Nov-2005
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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Addendum-Page 2
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