UNITRODE UC1634, UC2634, UC3634 Technical data

UC1634

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

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 = 25°C(Note 2) . . . . . . . . . . . 1000mW Power Dissipation at TC = 25°C (Note 2) . . . . . . . . . . . 2000mW Operating Junction Temperature . . . . . . . . . . . -55°C to +150°C Storage Temperature . . . . . . . . . . . . . . . . . . . . -65°C to +150°C Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C

DIL-16, SOIC-16 (TOP VIEW)

J or N Package, DW Package

UC1634

UC2634

UC3634

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
N/C	1
DIV 2/4/8	2
Lock Indicator Output	3
Phase Detector	4
Output
Disable Input	5
N/C	6
Driver A Output	7
Driver B Output	8
Sense Amp Output	9
5V Ref Output	10
Loop Amp Inv Input	11
Loop Amp Output	12
Buffer Amp Input	13
Buffer Amp Output	14
+VIN	15
N/C	16
OSC Output	17
OSC Input	18
Ground	19
DIV 4/5 Input	20

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = 0°C to +70°C for the UC3634, -25°C to + 85°C for the UC2634 and -55°C to +125°C for the UC1634,

+VIN = 12V. TA=TJ.

PARAMETERS	TEST CONDITIONS	MIN	TYP	MAX	UNITS
Supply Current	+VIN = 15V		20	29	mA
Reference
Output Voltage (VREF)		4.75	5.0	5.25	V
Load Regulation	IOUT = 0mA to 7mA		5.0	20	mV
Line Regulation	+VIN = 8V to 15V		2.0	20	mV
Short Circuit Current	VOUT = 0V	12	30		mA
Oscillator
DC Voltage Gain	Oscillator In to Oscillator Out	12	16	20	dB
Input DC Level (VIB)	Oscillator In Pin Open, TJ = 25°C	1.15	1.3	1.45	V
Input Impedance (Note 3)	VIN = VIB ± 0.5V, TJ = 25°C	1.3	1.6	1.9	k Ω
Output DC Level	Oscillator In Pin Open, TJ = 25°C	1.2	1.4	1.6	V
Maximum Operating Frequency		10			MHz
Dividers
Maximum Input Frequency	Input = 1VPP at Oscillator In	10			MHz
Div. 4/5 Input Current	Input = 5V (Div. by 4)		150	500	μA
(Q Package Only, Note 4)	Input = 0V (Div. by 5)	-5.0	0.0	5.0	μA

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