PBL3775-1 Datasheet, PDF (1/8 Pages) Ericsson – Dual Stepper Motor Driver

February 1999
PBL 3775/1
Dual Stepper Motor Driver
Description
The PBL 3775/1 is a switch-mode (chopper), constant-current driver IC with two
channels, one for each winding of a two-phase stepper motor. The circuit is similar to
Ericsson´s PBL 3773/1. While several of Ericsson´s dual stepper motor drivers are
optimized for micro-stepping applications, PBL 3775/1 is equipped with a disable
input to simplify half-stepping operation.
The PBL 3775/1 contains a clock oscillator, which is common for both driver
channels, a set of comparators and flip-flops implementing the switching control, and
two output H-bridges, including recirculation diodes.
Voltage supply requirements are + 5 V for logic and + 10 to + 45 V for the motor.
The close match between the two driver channels guarantees consistent output
current ratios and motor positioning accuracy.
Key Features
• Dual chopper driver in a single
package.
• Operation down to -40°C.
• 750 mA continuous output current
per channel.
• Low power dissipation, 2.0 W at
2 x 500 mA output current.
• Close matching between channels
for high microstepping accuracy.
• Digital filter on chip eliminates
external filtering components.
• Plastic 22-pin batwing DIL package,
24-pin SOIC batwing or 28-pin power
PLCC. All with lead-frame for
heatsinking through PC board
copper.
Phase ₁
Dis₁ V_R1
C₁
PBL 3775/1
V_CC
V_CC
–
+
E₁
RQ
S
Logic
+
–
RC
Logic
+
SQ
R
–
Phase ₂
Dis ₂ V_R2
C₂
GND
E₂
Figure 1. Block diagram
M _A1
M _B1
V_MM1
V_MM2
M _B2
M _A2
PBL3775/1
377P5B/1L
PBL ^3775/1
28-pin PLCC package
22-pin plastic DIP package
24-pin SO package