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UC1634 UC2634 UC3634
Phase Locked Frequency Controller
FEATURES
* * * * * * * * * Precision Phase Locked Frequency Control System Communication Logic for 2-Phase Motors Disable Input for Motor Inhibit Crystal Oscillator Programmable Reference Frequency Dividers Phase Detector with Absolute Frequency Steering Digital Lock Indicator Two High Current Op-Amps 5V Reference Output
DESCRIPTION
The UC1634 series of devices is optimized to provide precision phase locked frequency control for two phase DC brushless motors. These devices include most of the features of the general purpose UC1633 Phase Locked Control family and also provide the out-of-phase commutation signals required for driving two phase brushless motors. Only an external power booster stage is required for a complete drive and control system. The two commutation outputs are open collector devices that can sink in excess of 16mA. A disable input allows the user to simultaneously force both of these outputs to an active low state. Double edge logic, following the sense amplifier, doubles the reference frequency at the phase detector by responding to both edges of the input signal at Pin 7.
BLOCK DIAGRAM
6/93
UC1634 UC2634 UC3634 ABSOLUTE MAXIMUM RATINGS (Note 1, 2)
Input Supply Voltage (+VIN). . . . . . . . . . . . . . . . . . . . . . . . +20V Reference Output Current . . . . . . . . . . . . . . . . . . . . . . . -30mA Op-Amp Output Currents . . . . . . . . . . . . . . . . . . . . . . . . 30mA Op-Amp Input Voltages . . . . . . . . . . . . . . . . . . . . . -.3V to +20V Phase Detector Output Current . . . . . . . . . . . . . . . . . . . 10mA Lock Indicator Output Current . . . . . . . . . . . . . . . . . . . . +15mA Lock Indicator Output Voltage . . . . . . . . . . . . . . . . . . . . . . +20V Divide Select Input Voltage . . . . . . . . . . . . . . . . . . -.3V to +10V Disable Input Voltage . . . . . . . . . . . . . . . . . . . . . . . -.3V to +10V Oscillator Input Voltage . . . . . . . . . . . . . . . . . . . . . . -.3V to +5V Sense Amplifier Input Voltage . . . . . . . . . . . . . . . . -.3V to +20V Driver Output Currents . . . . . . . . . . . . . . . . . . . . . . . . . . +30mA Driver Output Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20V Power Dissipation at TA = 25C(Note 2) . . . . . . . . . . . 1000mW Power Dissipation at TC = 25C (Note 2) . . . . . . . . . . . 2000mW Operating Junction Temperature . . . . . . . . . . . -55C to +150C Storage Temperature . . . . . . . . . . . . . . . . . . . . -65C to +150C Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300C
Note 1: Voltages are referenced to ground, (Pin 16, DIL Package). Currents are positive into, negative out of, the specified terminals. Note 2: Consult Packaging Section of Databook for thermal limitations and considerations of package.
CONNECTION DIAGRAMS
PLCC-20 (TOP VIEW) Q Package
PACKAGE PIN FUNCTION FUNCTION PIN
DIL-16, SOIC-16 (TOP VIEW) J or N Package, DW Package
N/C DIV 2/4/8 Lock Indicator Output Phase Detector Output Disable Input N/C Driver A Output Driver B Output Sense Amp Output 5V Ref Output Loop Amp Inv Input Loop Amp Output Buffer Amp Input Buffer Amp Output +VIN N/C OSC Output OSC Input Ground DIV 4/5 Input
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = 0C to +70C for the
UC3634, -25C to + 85C for the UC2634 and -55C to +125C for the UC1634, +VIN = 12V. TA=TJ. TEST CONDITIONS +VIN = 15V 4.75 IOUT = 0mA to 7mA +VIN = 8V to 15V VOUT = 0V Oscillator In to Oscillator Out Oscillator In Pin Open, TJ = 25C VIN = VIB 0.5V, TJ = 25C Oscillator In Pin Open, TJ = 25C 12 12 1.15 1.3 1.2 10 10 -5.0 150 0.0 500 5.0 MIN TYP 20 5.0 5.0 2.0 30 16 1.3 1.6 1.4 20 1.45 1.9 1.6 29 5.25 20 20 PARAMETERS Supply Current Reference Output Voltage (VREF) Load Regulation Line Regulation Short Circuit Current Oscillator DC Voltage Gain Input DC Level (VIB) Input Impedance (Note 3) Output DC Level Maximum Operating Frequency Dividers Maximum Input Frequency Div. 4/5 Input Current (Q Package Only, Note 4) MAX UNITS mA V mV mV mA dB V k V MHz MHz A A
Input = 1VPP at Oscillator In Input = 5V (Div. by 4) Input = 0V (Div. by 5)
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UC1634 UC2634 UC3634 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = 0C to +70C for the
UC3634, -25C to + 85C for the UC2634 and -55C to +125C for the UC1634, +VIN = 12V. TA=TJ PARAMETERS Dividers (cont.) Div. 4/5 Input Threshold (Q Package Only, Note 4) Div. 2/4/8 Input Current Div. 2/4/8 Open Current Voltage Div. by 2 Threshold Div. by 4 Threshold Div. by 8 Threshold Sense Amplifier Threshold Voltage Threshold Hysteresis Input Bias Current Two Phase Drive Outputs, A and B Saturation Voltage Leakage Current Disable Input Input Current Threshold Voltage Phase Detector 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) Lock Indicator Output Saturation Voltage Leakage Current Loop Amplifier N INV. Reference Voltage Input Bias Current AVOL PSRR Short Circuit Current Buffer Op-Amp Input Offset Voltage Input Bias Current PSRR CMRR Short Circuit Current Percent of VREF Input = 1.5V IOUT = 16mA VOUT = 15V Input = 5V (Disabled, A and B Outputs Active Low) Input = 0V (Enabled) 27 -1.0 30 10 -0.2 0.3 0.1 150 0.0 1.6 0.2 0.2 50 8.0 5.0 6.0 0.3 0.1 47 -0.8 60 70 16 16 50 -0.2 75 100 35 30 8 -0.8 70 70 16 16 -0.2 100 100 35 30 33 % mV A V A A A V V V % mA mA k V A % A dB dB mA mA mV A dB dB mA mA TEST CONDITIONS MIN 0.5 Input = 5V (Div. by 8) Input = 0V (Div. by 2) Input Current = 0A (Div. by 4) -500 1.5 0.20 1.5 Volts Below VREF 0.20 0.8 TYP 1.6 150 -150 2.5 0.8 MAX UNITS 2.2 500 3.5 3.5 V A A V V V V
0.6 5.0 500 5.0 2.2 0.5 0.5 53
-5.0 0.5
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 Freq. Error, IOUT = 5mA Zero Freq. Error, VOUT = 15V Percent of VREF Input = 2.5V +VIN = 8V to 15V Source, VOUT = 0V Sink, VOUT = 5V VCM = 2.5V VCM = 2.5V +VIN = 8 to 15V VCM = 0 to 10V Source, VOUT = 0V Sink, VOUT = 5V 47 2.0 2.0 4.5
7.5 0.45 1.0 53
Note 3: These impedance levels will vary with TJ at about 1700ppm/C. Note 4: This part is also available in a 20 pin plastic leadless chip carrier, Q designator, where a divide by 4/5 select pin is available. Consult factory for details.
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UC1634 UC2634 UC3634 APPLICATION AND OPERATION INFORMATION (For additional information see UC1633 data sheet) Design Example:
Precision phased locked frequency control of a 2-phase motor at 3600 RPM. Using the commutation logic on the UC3634, a simple discrete drive scheme is possible.
UNITRODE INTEGRATED CIRCUITS 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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