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PBL3771-1

Ericsson

Precision Stepper Motor Driver

February 1999 PBL 3771/1 Precision Stepper Motor Driver Description The PBL 3771/1 is a switch-mode, constant-current d...


Ericsson

PBL3771-1

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Description
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 "b...




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