PBL3717-2 - Ericsson

PBL3717-2 Stepper Motor Drive Circuit

PBL 3717/2 is a bipolar monolithic circuit intended to control and drive the current in one winding of a stepper motor. 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 with built-in protection diodes. Two PBL 3717/2 and a small number of external components for.

Features

• Half-step and full-step modes.
• Switched mode bipolar constant current drive.
• Wide range of current control 5 - 1200 mA.
• Wide voltage range 10 - 50 V.
• Designed for unstabilized motor supply voltage.
• Current levels can be selected in steps or varied continuously.
• Thermal overload protection. VCC Schmitt Trigger Phase I1 I0 VR & & & & ≥1 Time Delay VMM VMM PB L3 16-pin plastic batwing DIP 1 1 1 MA MB ≥1 28-pin plastic PLCC package +
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  – 71 L B /2 P 17 37 Output Stage Monostable t = 0.69
• R
• C off T T Current Sensor PB PBL 3717/2 E L 7/ 1 7 3 GND C T Figure 1.