PBL3770A - Ericsson

PBL3770A High Performance Stepper Motor Drive Circuit

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 .

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. VCC Schmitt Trigger Time Delay VMM VMM Phase I 1 1 ≥1 ≥1 P B L B A P 70 37 MA I0 V R MB & +
  – +
  – +
  – GND & & & ≥1 ≥1 L Monostable t off = 0.69
• RT
• CT Current Sensor 37 PBL 3770A C T E 16-pin plastic batwing DIP 28-pin plastic PLCC package 20-pin SO Figure 1. Block diag.