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UC1635 UC2635 UC3635
Phase Locked Frequency Controller
FEATURES
* * * * * * * * Precision Phase Locked Frequency Control System Crystal Oscillator Programmable Reference Frequency Dividers
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.
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
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 = 25C, (Note 2) . . . . . . . 1000mW Power Dissipation at TC = 25C, (Note 2) . . . . . . . 2000mW Operating Junction Temperature . . . . . . . . . -55 to 150C Storage Temperature . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (Soldering, 10 Seconds) . . . . . . . 300C
CONNECTION DIAGRAMS
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.
DIL-16 (Top View) J & N Packages
PLCC-20 & LCC-20 (Top View) Q & L 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 = 0C to +70C for the UC3635, -25C to +85C for ELECTRICAL the UC2635 and -55C to +125C for the UC1635, +VIN = 12V. TA = TJ. CHARACTERISTICS: PARAMETER Supply Current Reference Output Voltage (VREF) Load Regulation Line Regulation Short Circuit Current IOUT = 0 to 7mA +VIN = 8 to 15V VOUT = 0V 15 4.75 5.0 5.0 2.0 35 5.25 20 20 V mV mV mA +VIN = 15V TEST CONDITIONS MIN TYP 20 MAX 28 UNITS mA
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UC1635 UC2635 UC3635 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, specifications hold for TA = 0C to +70C for the UC3635,
-25C to +85C for the UC2635 and -55C to +125C for the UC1635, +Vin = 12V. TA = TJ. PARAMETER Oscillator DC Voltage Gain Input DC Level (VIB) Input Impedance (Note 2) Output DC Level Maximum Operating Frequency Dividers Maximum Input Frequency Div 2/4 Input Current Input = 1Vpp at Oscillator Input Input = 5V (Div. by 2) Input = 0V (Div. by 4) Div 2/4 Threshold Divider Output High Level (w/6.8k Load to GND) Low Level (Open Collector Leakage) Sense Amplifier Threshold Voltage Threshold Hysteresis Input Bias Current Double Edge Disable Input Input Current Input = 5V (Disabled) Input = 0V (Enabled) Threshold Voltage Phase Detector -Input Threshold -Input Current High Output Level Low Output Level Mid Output Level High Level Maximum Source Current Low Level Maximum Sink Current Mid Level Output Impedance (Note 3) Loop Amplifier Non-Inv Reference Voltage Input Bias Current AVOL PSRR Short Circuit Current +VIN = 8 to 15V Source, VOUT = 0V Sink, VOUT = 5V Percent of VREF Input = 2.5V 47 -0.8 60 70 16 16 50 -0.2 75 100 35 30 53 % A dB dB mA mA Detector Responds to Falling Edge Input = 2.2V Positive Phase/Freq. Error, Volts Below VREF Negative Phase/Freq. Error Zero Phase/Freq. Error, Percent of VREF VOUT = 4.3V VOUT 0.7V IOUT = -200 to +200A, TJ = 25C 47 2.0 2.0 4.5 0.5 1.6 100 0.2 0.2 50 8.0 5.0 6.0 7.5 2.2 250 0.5 0.5 53 V A V V % mA mA k -5.0 0.5 150 0.0 1.6 500 5.0 2.2 A A V Input = 1.5V -1.0 Percent of VREF 27 30 10 -0.2 33 % mV A -5.0 0.5 4.0 10 150 0.0 1.6 4.5 10 500 5.0 2.2 MHz A A V V A Oscillator Input to Oscillator Output Oscillator Input Pin Open, TJ = 25C VIN = VIB 0.5V, TJ = 25C Oscillator Input Pin Open, TJ = 25C 12 1.15 1.3 1.2 10 16 1.3 1.6 1.4 20 1.45 1.9 1.6 dB V k V MHz TEST CONDITIONS MIN TYP MAX UNITS
Note 3: These impedance levels will vary with TJ at about 1700ppm/ C.
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UC1635 UC2635 UC3635 ELECTRICAL CHARACTERISTICS (cont.): Unless otherwise stated, specifications hold for TA = 0C to +70C for the UC3635, -25C to +85C for the UC2635 and -55C to +125C for the UC1635, +Vin = 12V. TA = TJ.
PARAMETER Auxiliary Op-Amp Input Offset Voltage Input Bias Current Input Offset Current AVOL PSRR CMRR Short Circuit Current +VIN = 8 to 15V VCM = 0 to 10V Source, VOUT = 0V Sink, VOUT = 5V VCM = 2.5V VCM = 2.5V VCM = 2.5V 70 70 70 16 16 -0.8 -0.2 .01 120 100 100 35 30 0.1 8 mV A A dB dB dB mA mA TEST CONDITIONS MIN TYP MAX UNITS
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
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Copyright (c) 1999, Texas Instruments Incorporated

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