February 1999
PBL 377 17/1
60 V Stepper Motor
Drive Circuit
Description
PBL 377 17/1 is a bipolar monolithic circuit intended to control and drive the current
in one winding of a stepper motor.
The circuit consists of a LS-TTL compatible logic input stage, a current sensor, a
monostable multivibrator and a high power H-bridge output stage with built-in
protection diodes.
Two PBL 377 17/1 and a small number of external components form a complete
control and drive unit for LS-TTL or microprocessor-controlled stepper motor
systems.
Key Features
• Half-step and full-step modes.
• Switched mode bipolar constant
current drive.
• Wide range of current control
5 - 1200 mA.
• Wide voltage range 10 - 60 V.
• Designed for unstabilized motor
supply voltage.
• Current levels can be selected in
steps or varied continuously.
• Thermal overload protection.
• Built-in recirculation diodes.
P
B
L
37
71
VCC
Schmitt
Trigger
Phase
I1
I0
VR
&
&
&
&
≥1
≥1
Time
Delay
1
1
1
MA
MB
VMM
VMM
7/
1
16-pin plastic
batwing DIP
L
B /1
P 7
71
28-pin plastic
PLCC package *
37
+
–
+
–
+
–
Output Stage
Monostable
t = 0.69 • R • C
T T
off
Current Sensor
L3
PB
PBL 377 17/1
7
7
71
/1
GND
C
T
E
20-pin SO wide
batwing package
Figure 1. Block diagram.
* To be released
1
ERICSSON [ ERICSSON ]
