TI UC2635

UC1635
UC2635
UC3635
Phase Locked Frequency Controller
FEATURES
DESCRIPTION
•
Precision Phase Locked Frequency
Control System
•
Crystal Oscillator
•
Programmable Reference Frequency
Dividers
•
The UC1635 family of integrated circuits was designed for use in precision speed control of DC motors. An extension to the UC1633 line of
phase locked controllers, these devices provide access to both of the
digital phase detector’s inputs, and include a reference frequency divider output pin. With this added flexibility, this family of controllers can
be used to obtain phase synchronization of multiple motors.
Phase Detector with Absolute Frequency
A reference frequency can be generated using the device’s crystal oscilSteering
lator and programmable dividers. The oscillator operates using a broad
Separate Divider Outputs and Phase
range of crystals, or, can function as a buffer stage to an external freDetector Input Pins
quency source.
Double Edge Option on the Frequency
The phase detector responds proportionally to the phase error between
Feedback Sensing Amplifier
the detector’s minus input pin and the sense amplifier output. This
Two High Current Op Amps
phase detector includes absolute frequency steering to provide maximum drive signals when any frequency error exists. This feature allows
5V Reference Output
optimum start-up and lock times to be realized.
•
•
•
•
Two op-amps are included that can be configured to provide necessary
loop filtering. The outputs of these op-amps will source or sink in excess
of 16mA, so they can provide a low impedance control signal to driving
circuits.
Additional features include a double edge option on the sense amplifier
that can be used to double the loop reference frequency for increased
loop bandwidths. A 5V reference output can be used to accurately set
DC operating levels.
BLOCK DIAGRAM
UDG-92019
7/97
UC1635
UC2635
UC3635
ABSOLUTE MAXIMUM RATINGS
CONNECTION DIAGRAMS
Input Supply Voltage (+VIN) . . . . . . . . . . . . . . . . . . . . +20V
Reference Output Current . . . . . . . . . . . . . . . . . . . . . -30mA
Op-Amp Output Currents . . . . . . . . . . . . . . . . . . . . ±30mA
Op-Amp Input Voltages . . . . . . . . . . . . . . . . . . -0.3 to +20V
Phase Detector Input Voltage . . . . . . . . . . . . . -0.3V to +5V
Phase Detector Output Current . . . . . . . . . . . . . . . . ±10mA
Lock Indicator Output Current . . . . . . . . . . . . . . . . . +15mA
Lock Indicator Output Voltage . . . . . . . . . . . . . . . . . . . +20V
Divide Select Input Voltages . . . . . . . . . . . . -0.3V to +10V
Double Edge Disable Input Voltage . . . . . . . -0.3V to +10V
Oscillator Input Voltage . . . . . . . . . . . . . . . . . . -0.3V to +5V
Sense Amplifier Input Voltage . . . . . . . . . . . . -0.3V to +20V
Power Dissipation at TA = 25°C, (Note 2) . . . . . . . 1000mW
Power Dissipation at TC = 25°C, (Note 2) . . . . . . . 2000mW
Operating Junction Temperature . . . . . . . . . -55° to 150°C
Storage Temperature . . . . . . . . . . . . . . . . . -65° to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . 300°C
SOIC–16 (Top View)
DW Package
Note 1: Voltages are referenced to ground, (Pin 16). Currents
are positive into, negative out of, the specified terminals.
Note 2: Consult Unitrode Integrated Circuits databook for information regarding thermal specifications and limitations of
packages.
PLCC-20 & LCC-20
(Top View)
Q & L Packages
DIL–16 (Top View)
J & N Packages
PACKAGE PIN FUNCTION
FUNCTION
N/C
Div 2/4
Phase Detector Input
Divider Output
Phase Detector Output
N/C
Dbl Edge Disable Input
Sense Amp Input
5V Ref Output
Loop Amp Inv Input
N/C
Loop Amp Output
Aux Amp Non-Inv Input
Aux Amp Inv Input
Aux Amp Output
N/C
+VIN
OSC Output
OSC Input
Ground
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Unless otherwise stated, specifications hold for TA = 0°C to +70°C for the UC3635, -25°C to +85°C for
ELECTRICAL
the UC2635 and -55°C to +125°C for the UC1635, +VIN = 12V. TA = TJ.
CHARACTERISTICS:
PARAMETER
Supply Current
TEST CONDITIONS
MIN
+VIN = 15V
TYP
MAX
UNITS
20
28
mA
5.0
5.25
V
Reference
Output Voltage (VREF)
4.75
Load Regulation
IOUT = 0 to 7mA
5.0
20
mV
Line Regulation
+VIN = 8 to 15V
2.0
20
mV
Short Circuit Current
VOUT = 0V
15
2
35
mA
UC1635
UC2635
UC3635
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, specifications hold for TA = 0°C to +70°C for the UC3635,
-25°C to +85°C for the UC2635 and -55°C to +125°C for the UC1635, +Vin = 12V. TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator
DC Voltage Gain
Oscillator Input to Oscillator Output
12
16
20
dB
Input DC Level (VIB)
Oscillator Input Pin Open, TJ = 25°C
1.15
1.3
1.45
V
Input Impedance (Note 2)
VIN = VIB ±0.5V, TJ = 25°C
1.3
1.6
1.9
kΩ
Output DC Level
Oscillator Input Pin Open, TJ = 25°C
1.2
1.4
1.6
V
Maximum Operating Frequency
10
MHz
10
MHz
Dividers
Maximum Input Frequency
Input = 1Vpp at Oscillator Input
Div 2/4 Input Current
Input = 5V (Div. by 2)
Input = 0V (Div. by 4)
Div 2/4 Threshold
Divider Output
High Level (w/6.8k Load to GND)
150
500
µA
-5.0
0.0
5.0
µA
0.5
1.6
2.2
V
4.0
4.5
Low Level (Open Collector Leakage)
V
10
µA
33
%
Sense Amplifier
Threshold Voltage
27
Percent of VREF
Threshold Hysteresis
Input Bias Current
Input = 1.5V
-1.0
30
10
mV
-0.2
µA
Double Edge Disable Input
Input Current
150
500
µA
-5.0
0.0
5.0
µA
0.5
1.6
2.2
V
0.5
1.6
2.2
V
Input = 5V (Disabled)
Input = 0V (Enabled)
Threshold Voltage
Phase Detector
-Input Threshold
Detector Responds to Falling Edge
-Input Current
Input = 2.2V
100
250
µA
High Output Level
Positive Phase/Freq. Error, Volts Below VREF
0.2
0.5
V
Low Output Level
Negative Phase/Freq. Error
0.2
0.5
V
Mid Output Level
Zero Phase/Freq. Error, Percent of VREF
47
50
53
%
High Level Maximum Source
Current
VOUT = 4.3V
2.0
8.0
mA
Low Level Maximum Sink Current
VOUT 0.7V
2.0
5.0
mA
Mid Level Output Impedance
(Note 3)
IOUT = -200 to +200µA, TJ = 25°C
4.5
6.0
7.5
kΩ
Non-Inv Reference Voltage
Percent of VREF
47
50
53
%
Input Bias Current
Input = 2.5V
-0.8
-0.2
µA
Loop Amplifier
AVOL
60
75
dB
PSRR
+VIN = 8 to 15V
70
100
dB
Short Circuit Current
Source, VOUT = 0V
16
35
mA
Sink, VOUT = 5V
16
30
mA
Note 3: These impedance levels will vary with TJ at about 1700ppm/ °C.
3
UC1635
UC2635
UC3635
ELECTRICAL CHARACTERISTICS (cont.): Unless otherwise stated, specifications hold for TA = 0°C to +70°C for the
UC3635, -25°C to +85°C for the UC2635 and -55°C to +125°C for the UC1635, +Vin = 12V. TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
8
mV
Auxiliary Op-Amp
Input Offset Voltage
VCM = 2.5V
Input Bias Current
VCM = 2.5V
Input Offset Current
VCM = 2.5V
-0.8
.01
AVOL
µA
-0.2
0.1
µA
70
120
dB
PSRR
+VIN = 8 to 15V
70
100
dB
CMRR
VCM = 0 to 10V
70
100
dB
Short Circuit Current
Source, VOUT = 0V
16
35
mA
Sink, VOUT = 5V
16
30
mA
Application and Operation Information
(For Additional Application Information see the UC1633 Data Sheet)
(Pin numbers refer to DIL and SOIC packages)
Phase Detector Input Detail
UDG-92012
Reference Divider Output Detail
UDG-92011-1
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
4
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