UNITRODE UC1635, UC2635, UC3635 Technical data

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Phase Locked Frequency Co ntroller

FEATURES DESCRIPTION

•

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

The UC1635 fa mily of i ntegra ted circui ts was desi gned for use in preci­sion speed c ontrol 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 pro grammabl e divide rs. The osc illator operates using a broad
range of cr ystals, or, can functi on as a buffer stage to an external fre­quency source.

The phase de tector responds proportional ly 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 sign als when any frequency error exists. This feature allows
optimum start-up and lock times to be realized.

UC1635
UC2635
UC3635

BLOCK DIAGRAM

Two op-amps are included that can be confi gure d to provide necessary
loop filtering. The outputs of these op-amps will source or sink in excess
of 16mA, s o they c an pr ovide a low i mpedan ce cont rol signal to driving
circuits.

Additional features include a double edge option on the sens e amplifier
that can be used to doubl e the loop reference frequency for increased
loop bandwi dths. A 5V reference output can be used to accurately set
DC operating levels.

7/97

UDG-92019

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 = 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

Note 1: Vo lt ag es are ref ere nc ed to gro un d, (Pin 16). Currents
are positive into, negative out of, the specified terminals.
Note 2: Consult Uni tro de Int eg rated Circuits databook for in ­formation regarding therm al specifications and limitations of
packages.

DIL–16 (Top View)
J & N Packages

CONNECTION DIAGRAMS

SOIC–16 (Top View)
DW Package

PLCC-20 & LCC-20
(Top View)
Q & L Packages

N/C 1
Div 2/4 2
Phase Detector Input 3
Divider Output 4
Phase Detector Output 5
N/C 6
Dbl Edge Disable Input 7
Sense Amp Input 8
5V Ref Output 9
Loop Amp Inv Input 10
N/C 11
Loop Amp Output 12
Aux Amp Non-Inv Input 13
Aux Amp Inv Input 14
Aux Amp Output 15
N/C 16
+V
OSC Output 18
OSC Input 19
Ground 20

PACKAGE PIN FUNCTION

FUNCTION

IN

PIN

17

ELECTRICAL
CHARACTERISTICS:

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Supply Current +VIN = 15V 20 28 mA

Reference

Output Voltage (V
Load Regulation I
Line Regulation +V
Short Circuit Current V

REF

Unless otherwise stated, specifications hold for T
the UC2635 and -55°C to +125°C for the UC1635, +V

) 4.75 5.0 5.25 V

= 0 to 7mA 5.0 20 mV

OUT

= 8 to 15V 2.0 20 mV

IN

= 0V 15 35 mA

OUT

= 0°C to +70°C for the UC3635, -25°C to +85°C for

A

= 12V. TA = T

IN

J.

2