UNITRODE UC1635, UC2635, UC3635 Technical data
UC1635
UC1635
UC2635 UC3635
Phase Locked Frequency Controller
FEATURES
∙Precision Phase Locked Frequency Control System
∙Crystal Oscillator
∙Programmable Reference Frequency Dividers
∙Phase Detector with Absolute Frequency Steering
∙Separate Divider Outputs and Phase Detector Input Pins
∙Double Edge Option on the Frequency Feedback Sensing Amplifier
∙Two High Current Op Amps
∙5V Reference Output
BLOCK DIAGRAM
DESCRIPTION
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.
A reference frequency can be generated using the device’s crystal oscillator and programmable dividers. The oscillator operates using a broad range of crystals, or, can function as a buffer stage to an external frequency source.
The phase detector responds proportionally to the phase error between the detector’s minus input pin and the sense amplifier output. This phase detector includes absolute frequency steering to provide maximum drive signals when any frequency error exists. This feature allows 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.
UDG-92019 |
7/97 |
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UC1635 |
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UC2635 |
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UC3635 |
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ABSOLUTE MAXIMUM RATINGS |
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CONNECTION DIAGRAMS |
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Input Supply Voltage (+VIN) |
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. . . . . . . . +20V |
SOIC–16 (Top View) |
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Reference Output Current |
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-30mA |
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DW Package |
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Op-Amp Output Currents |
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±30mA |
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Op-Amp Input Voltages . . . . |
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. -0.3 to +20V |
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Phase Detector Input Voltage . . . . . . . . |
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. -0.3V to +5V |
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Phase Detector Output Current . . . . . . . |
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. . . . . ±10mA |
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Lock Indicator Output Current . . . . . . . . |
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. . . . . +15mA |
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Lock Indicator Output Voltage . . . . . . . . |
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. . . . . . . +20V |
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Divide Select Input Voltages |
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-0.3V to +10V |
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Double Edge Disable Input Voltage . . . |
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-0.3V to +10V |
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Oscillator Input Voltage . . . . |
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. -0.3V to +5V |
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Sense Amplifier Input Voltage . . . . . . . . |
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-0.3V to +20V |
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Power Dissipation at TA = 25°C, (Note 2) . . . |
. . . . 1000mW |
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Power Dissipation at TC = 25°C, (Note 2) . . . |
. . . . 2000mW |
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Operating Junction Temperature . . . . . |
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-55° to 150°C |
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Storage Temperature . . . . . |
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-65° to +150°C |
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Lead Temperature (Soldering, 10 Seconds) . |
. . . . . . 300°C |
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Note 1: Voltages are referenced to ground, (Pin 16). Currents |
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are positive into, negative out of, the specified terminals. |
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Note 2: Consult Unitrode Integrated Circuits databook for in- |
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formation regarding thermal specifications and limitations of |
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packages. |
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DIL–16 (Top View) |
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PLCC-20 & LCC-20 |
PACKAGE PIN FUNCTION |
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J & N Packages |
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(Top View) |
FUNCTION |
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PIN |
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Q & L Packages |
N/C |
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1 |
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Div 2/4 |
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2 |
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Phase Detector Input |
3 |
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Divider Output |
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4 |
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Phase Detector Output |
5 |
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N/C |
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6 |
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Dbl Edge Disable Input |
7 |
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Sense Amp Input |
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8 |
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5V Ref Output |
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9 |
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Loop Amp Inv Input |
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10 |
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N/C |
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11 |
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Loop Amp Output |
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12 |
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Aux Amp Non-Inv Input |
13 |
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Aux Amp Inv Input |
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14 |
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Aux Amp Output |
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15 |
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N/C |
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16 |
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+VIN |
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17 |
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OSC Output |
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18 |
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OSC Input |
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19 |
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Ground |
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20 |
ELECTRICAL |
Unless otherwise stated, specifications hold for TA = 0°C to +70°C for the UC3635, -25°C to +85°C for |
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the UC2635 and -55°C to +125°C for the UC1635, +VIN = 12V. TA = TJ. |
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CHARACTERISTICS: |
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PARAMETER |
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TEST CONDITIONS |
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TYP |
MAX |
UNITS |
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Supply Current |
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+VIN = 15V |
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20 |
28 |
mA |
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Reference |
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Output Voltage (VREF) |
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4.75 |
5.0 |
5.25 |
V |
Load Regulation |
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IOUT = 0 to 7mA |
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5.0 |
20 |
mV |
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Line Regulation |
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+VIN = 8 to 15V |
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2.0 |
20 |
mV |
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Short Circuit Current |
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VOUT = 0V |
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15 |
35 |
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mA |
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2
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