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. 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