PBL3771N Ericsson Microelectronics, PBL3771N Datasheet
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PBL3771N
Manufacturer Part Number
PBL3771N
Description
DIP-22
Manufacturer
Ericsson Microelectronics
Specifications of PBL3771N
Date_code
07+
Figure 1. Block diagram.
Description
The PBL 3771/1 is a switch-mode, constant-current driver IC (chopper) with two
channels, one for each winding of a two-phase stepper motor. The circuit is especially
developed for use in microstepping applications in conjunction with the matching dual
DAC (Digital-to-Analog Converter) PBM 3960. 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.
channels; a set of comparators and flip-flops implementing the switching control; and
two H-bridges with internal recirculation diodes. Voltage supply requirements are +5 V
for logic and +10 to +45 V for the motor. Maximum output current is 650 mA per
channel.
stage for improved high-speed microstepping.
current ratios and motor positioning accuracy.
V
RC
CC
The PBL 3771/1 contains a clock oscillator, which is common for both driver
A special logic function is used to select slow or fast current decay in the output
The close match between the two driver channels guarantees consistent output
PBL 3771/1
+
–
V
CC
Phase
Phase
2
1
CD
CD
2
1
V
V
R1
R2
C
C
Precision Stepper Motor Driver
1
2
–
+
+
+
+
–
–
–
GND
S
R
R
S
Q
Q
Logic
Logic
E
E
2
1
V
M
M
V
M
M
MM1
MM2
A1
B1
B2
A2
Key Features
• Dual chopper driver in a single
• 650 mA output current per channel.
• Close matching between channels for
• Selectable slow/fast current decay for
• Improved low-level linearity.
• Specially matched to Dual DAC
• Selection of packages, 22-pin
package.
high microstepping accuracy.
improved high-speed microstepping.
PBM 3960.
“batwing” DIP, 24 pin "batwing" SOIC
or 28-lead PLCC with lead-frame for
heat-sinking through PC board
copper.
22-pin plastic DIP package
PBL 3771/1
28-pin PLCC package
24-pin SO package
February 1999
1