PBL3771 Ericsson Microelectronics, PBL3771 Datasheet

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PBL3771

Manufacturer Part Number
PBL3771
Description
Precision Stepper Motor Driver
Manufacturer
Ericsson Microelectronics
Datasheet

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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

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PBL3771 Summary of contents

Page 1

Description The PBL 3771 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 ...

Page 2

PBL 3771/1 Maximum Ratings Parameter Voltage Logic supply Motor supply Logic inputs Comparator inputs Reference inputs Current Motor output current Logic inputs Analog inputs Oscillator charging current Temperature Operating junction temperature Storage temperature** ** Circuit only. The packaging can handle ...

Page 3

Electrical Characteristics Electrical characteristics over recommended operating conditions, unless otherwise noted. - Parameter Symbol fig. General Supply current I CC Total power dissipation P D Turn-off delay t d Logic Inputs Logic HIGH input voltage V IH ...

Page 4

PBL 3771 VMM VMM PBL 2 GND GND 19 6 3771 GND 7 GND ...

Page 5

Functional Description Each channel of the PBL 3771/1 consists of the following sections: an H-bridge output stage, capable of driving up to 650 mA continuous motor current (or 500 mA, both channels driven), a logic section that controls the output ...

Page 6

PBL 3771/1 External components The voltage across the sensing resistor is fed back to the comparator via a low- pass filter section, to prevent erroneous switching due to switching transients. The recommended filter component values, 1 kohm and 820 pF, ...

Page 7

General Phase inputs. A logic HIGH on a Phase input gives positive current flowing out from M into logic LOW gives current in the opposite direction. Slow/fast current decay. A logic HIGH on the ...

Page 8

PBL 3771/1 Thermal resistance [ C/ PCB copper foil area [cm ] PLCC package DIP package Figure 13. Thermal Resistance vs. PC Board copper area and suggested layout. ...

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