鈥?/div>
Complete Motor Driver and Encoder
DESCRIPTION
The UC3517 contains four NPN drivers that operate in two-phase
fashion for full-step and half-step motor control. The UC3517
Continuous Drive Capability 350mA per Phase
also contains two emitter followers, two monostables, phase de-
coder logic, power-on reset, and low-voltage protection, making it
Contains all Required Logic for Full and Half
Stepping
a versatile system for driving small stepper motors or for control-
ling large power devices.
Bilevel Operation for Fast Step Rates
The emitter followers and monostables in the UC3517 are config-
Operates as a Voltage Doubler
ured to apply higher-voltage pulses to the motor at each step
command. This drive technique, called 鈥淏ilevel,鈥?allows faster
Useable as a Phase Generator and/or as a
stepping than common resistive current limiting, yet generates
Driver
less electrical noise than chopping techniques.
Power-On Reset Guarantees Safe,
Predictable Power-Up
ABSOLUTE MAXIMUM RATINGS
Second Level Supply, V
SS
. . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Phase Output Supply, V
MM
. . . . . . . . . . . . . . . . . . . . . . . . . 40V
Logic Supply, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Logic Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . -.3V to +7V
Logic Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
卤
10mA
Output Current, Each Phase . . . . . . . . . . . . . . . . . . . . . . 500mA
Output Current, Emitter Follower . . . . . . . . . . . . . . . . . . -500mA
Power Dissipation, (Note). . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
Power Dissipation, (Note) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2W
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150掳C
Ambient Temperature, UC1517 . . . . . . . . . . . . -55掳C to +125掳C
Ambient Temperature, UC3517 . . . . . . . . . . . . . . 0掳C to +70掳C
Storage Temperature . . . . . . . . . . . . . . . . . . . -55掳C to +150掳C
Note: Consult Packaging section of Databook for thermal
limitations and considerations of package.
BLOCK DIAGRAM
8/94
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