PBL 3770A is a bipolar monolithic circuit intended to control and drive the current inone winding of a stepper motor. It is a high power version of PBL 3717 and specialcare has been taken to optimize the power handling capability without suffering inreliability.The circuit consists of a LS-TTL compatible logic input stage, a current sensor, amonostable multivibrator and a high power H-bridge output stage. The circuit ispin-compatible with the PBL 3717 industry-standard driver.Two PBL 3770A and a small number of external components form a completecontrol and drive unit for LS-TTL or microprocessor-controlled stepper motorsystems.
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