PBL3770A

High Performance Stepper Motor Drive Circuit

**Description**

PBL 3770A is a bipolar monolithic circuit intended to control and drive the current in one winding of a stepper motor. It is a high power version of PBL 3717 and special care has been taken to optimize the power handling capability without suffering in reliability.

The circuit consists of a LS-TTL compatible logic input stage, a current sensor, a monostable multivibrator and a high power H-bridge output stage. The circuit is pin-compatible with the PBL 3717 industry-standard driver.

Two PBL 3770A and a small number of external components form a complete control and drive unit for LS-TTL or microprocessor-controlled stepper motor systems.

**Key Features**

• Half-step and full-step operation.

• Switched mode bipolar constant current drive

• Wide range of current control 5 -1800 mA.

• Wide voltage range 10 - 45 V.

• Designed for unstabilized motor supply voltage.

• Current levels can be selected in steps or varied continuously.

• Thermal overload protection.