PBL3772-1 Ver la hoja de datos (PDF) - Ericsson
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PBL3772-1 Datasheet PDF : 8 Pages
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February 1999
PBL 3772/1
Dual Stepper Motor Driver
Description
The PBL 3772/1 is a switch-mode (chopper), constant-current driver IC with two
chan-nels, one for each winding of a two-phase stepper motor. The circuit is similar
to Ericsson´s PBL 3771/1, but has been designed to generate a minimum amount of
power dissipation and can deliver substantially more current to the stepper motor, up
to 1000 mA continuously per channel. At 2 x 750 mA output current, power
dissipation is only 1.8 W.
The circuit is designed for microstepping applications in conjunction with the
matching dual DAC (Digital-to-Analog Converter) PBM 3960/1. A complete driver
system consists of these two ICs, a few passive components and a microprocessor
for generation of the proper control and data codes required for microstepping.
The PBL 3772/1 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.
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 at -40 C
• 1000 mA continuous output current
per channel.
• Very low power dissipation, 1.8 W at
2 x 750 mA output current.
• Close matching between channels for
high microstepping accuracy.
• Specially matched to the Dual DAC
PBM 3960.
• Plastic 22-pin batwing DIP package
or 28-pin power PLCC with lead-
frame for heat-sinking through PC
board copper.
PBL 3772/1
Phase 1 VR1
C1
VCC
V
CC
–
+
VMM1
E1
RQ
S
Logic
+
–
RC
Logic
+
SQ
R
–
Phase 2 VR2
Figure 1. Block diagram.
C2
GND
VMM2
E2
M A1
M B1
VBB1
VBB2
M B2
M A2
377P2/B1L
PBL3772/1
28-pin PLCC package
22-pin plastic DIP package
1
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