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PBL3771-1

Ericsson
Part Number PBL3771-1
Manufacturer Ericsson
Description Precision Stepper Motor Driver
Published Mar 22, 2005
Detailed Description February 1999 PBL 3771/1 Precision Stepper Motor Driver Description The PBL 3771/1 is a switch-mode, constant-current d...
Datasheet PDF File PBL3771-1 PDF File

PBL3771-1
PBL3771-1

Overview
February 1999 PBL 3771/1 Precision Stepper Motor Driver 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.
The PBL 3771/1 contains a clock oscillator, which is common for both driver channels; a set of comparators and flip-flops implementing the switching control; and two 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.
A special logic function is used to select slow or fast current decay in the output stage for improved high-speed microstepping.
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.
• 650 mA output current per channel.
• Close matching between channels for high microstepping accuracy.
• Selectable slow/fast current decay for improved high-speed microstepping.
• Improved low-level linearity.
• Specially matched to Dual DAC PBM 3960.
• Selection of packages, 22-pin “batwing” DIP, 24 pin "batwing" SOIC or 28-lead PLCC with lead-frame for heat-sinking through PC board copper.
V CC V – + CC R S Q M A1 + – Logic M B1 P PBL 3771/1 V MM1 + – V MM2 M B2 – + + – Phase 2 CD2 V R2 C2 GND E2 28-pin PLCC package 22-pin plastic DIP package 24-pin SO package Figure 1.
Block diagram.
1 PB L S R Q 37 RC 71 /1 Logic M A2 B L L B 1 P 71/ 37 37 Phase 1 CD 1 V R1 C1 E1 71 /1 PBL 3771/1 Maximum Ratings Parameter Pin no.
(DIL) Symbol Min Max Unit Voltage Logic...


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