UNITRODE UC3770A, UC3770B Technical data

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High Performance Stepper Motor Drive Circuit

UC3770A
UC3770B

FEATURES

Full-Step, Half-Step and Micro-Step

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Capability.
Bipolar Output Current up to 2A.

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Wide Range of Motor Supply Voltage:

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10–50V
Low Saturation Voltage

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Wide Range of Current Control: 5mA–2A.

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Current Levels Selected in Steps or Varied

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Continuously.
Thermal Protection and Soft Intervention.

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BLOCK DIAGRAM

DESCRIPTION

The UC3770A and UC3770B are high-performance full bridge driv
ers that offer higher current and lower saturation voltage than the
UC3717 and the UC3770. Included in these devices are LS-TTL
compatible logic inputs, current sense, monostable, thermal shut
down, and a power H-bridge output stage. Two UC3770As or
UC3770Bs and a few external components form a complete micro
processor-controllable stepper motor power system.

Unlike the UC3717, the UC3770A and the UC3770B require exter
nal high-side clamp diodes. The UC3770A and UC3770B are
identical in all regards except for the current sense thresholds.
Thresholds for the UC3770A are identical to those of the older
UC3717 permitting drop-in replacement in applications where
high-side diodes are not required. Thresholds for the UC3770B are
tailored for half stepping applications where 50%, 71%, and 100%
current levels are desirable.

The UC3770A and UC3770B are specified for operation from 0°C
to 70°C ambient.

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SLUS403A - FEBRUARY 2000

UDG-92039-1

ABSOLUTE MAXIMUM RATINGS

Logic Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V

Output Supply Voltage, VMM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V

Logic Input Voltage (Pins 7, 8, 9). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V

Analog Input Voltage (Pin 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V

CC

Reference Input Voltage (Pin 11). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V

Logic Input Current (Pins 7, 8, 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10mA

Analog Input Current (Pins 10, 11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10mA

Output Current (Pins 1, 15). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 2A

Junction Temperature, T

J. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C

Note 1: All voltages are with respect to Gnd (DIL Pins 4, 5, 12, 13); all currents
are positive into, negative out of the specified terminal.
Note 2: Consult Unitrode Integrated Circuits databook for thermal limitations and
considerations of packages.

CONNECTION DIAGRAMS

DIL-16 (Top View)
J Or N Package

PLCC-28 (Top View)
Q Package

UC3770A
UC3770B

PACKAGE PIN FUNCTION

FUNCTION PIN

Gnd 1-3
V

M 4

N/C 5

OUT 6

A
N/C 7
Emitters 8
Gnd 9

OUT 10

B
Timing 11
V

M 12

Gnd 13-17
V

CC 18

I

1 19

Phase 20

0 21

I
N/C 22
Current 23
V

R 24

N/C 25-27
Gnd 28

ELECTRICAL CHARACTERISTICS: (All tests apply with VM = 36V, VCC = 5V, VR = 5V, No Load, and 0°C<TA<70°C, unless
otherwise stated, T

A =TJ.)

UC3770A UC3770B

PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

Supply Voltage V
Logic Supply Voltage V
Logic Supply Current I

M (Pins 3, 14) 10 45 10 45 V

CC (Pin 6) 4.75 5 5.3 4.75 5 5.3 V

CC (Pin 6) IO = I1 = H, IM = 0 15 25 15 25 mA

O = I1 = L, IM = 0 18 28 18 28 mA

I

O = I1 = H, IM = 1.3A 33 40 33 40 mA

I
Thermal Shutdown Temperature +170 +170 °C
Logic Threshold (Pins 7, 8, 9) 0.8 2.0 0.8 2.0 V
Input Current Low (Pin 8) V
Input Current Low (Pins 7, 9) V
Input Current High (Pins 7, 8, 9) V
Comparator Threshold (Pin 10) V

I = 0.4V -100 -100 µA
I = 0.4V -400 -400 µA
I = 2.4V 10 10 µA
R = 5V, I0 = L, I1 = L 400 415 430 400 415 430 mV
R = 5V, I0 = H, I1 = L 240 255 265 290 300 315 mV

V

R = 5V, I0 = L, I1 = H 70 80 90 195 210 225 mV

V
Comparator Input Current (Pin 10) ±20 ±20 µA
Off Time R

T = 56k, CT = 820pF 25 30 35 25 30 35 ms

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