PBL3775-1

February 1999 PBL 3775/1 Dual Stepper Motor Driver Description The PBL 3775/1 is a switch-mode (chopper), constant-current driver IC with two channels, one for each winding of a two-phase stepper motor. The circuit is similar to Ericsson´s PBL 3773/1. While several of Ericsson´s dual stepper motor drivers are optimized for micro-stepping applications, PBL 3775/1 is equipped with a disable input to simplify half-stepping operation. The PBL 3775/1 contains a clock oscillator, which is common for both driver channels, a set of comparators and flip-flops implementing the switching control, and two output H-bridges, including recirculation diodes. Voltage supply requirements are + 5 V for logic and + 10 to + 45 V for the motor. 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. Operation down to -40°C. 750 mA continuous output current per channel. Low power dissipation, 2.0 W at 2 x 500 mA output current. Close matching between channels for high microstepping accuracy. Digital filter on chip eliminates external filtering components. Plastic 22-pin batwing DIL package, 24-pin SOIC batwing or 28-pin power PLCC. All with lead-frame for heatsinking through PC board copper. VCC V – + CC R S Q M A1 P PBL 3775/1 B L B /1 P 75 37 Logic M B1 V MM1 V MM2 M B2 Logic M A2 + – + – L RC S R Q Phase 2 Dis 2 V R2 C2 GND E2 37 28-pin PLCC packag...