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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.

Key Features

? Dual chopper driver in a singlepackage.

? 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.