PBL3776-1 - Ericsson

PBL3776-1 Dual Controller IC for High Current Stepper Motor Applications

The PBL 3776/1 is a switch-mode (chopper), constant-current controller IC intended for controlling external transistors in a high current stepper motor application.The IC has two channels one for each winding of a two-phase stepper motor. The circuit is similar to Ericsson´s PBL 3775/1. PBL 3776/1 is equipped with a Disable input to simplify half-stepping op.

Features

• Suitable to drive any external Mos Fet or bipolar power transistor.
• 0°C to +85°C operation.
• Few external components.
• Crossconduction prevented by time delay.
• Close matching between channels for high positioning accuracy.
• Digital filter on chip eliminates external filtering components.
• Plastic 24-pin "narrow" DIP package. Phase 1 Dis 1 V R1 C1 SGND 1 Pwr GND 1 1 PBL 3776/1
  – T1BL R S Q T1AL T1BU T1AU Logic V CC V CC + +
  – V BB2 T2BU Logic RC +
  – T2AU T 2AL T2BL S R Q 24-pin plastic DIP package, narrow Phase 2 Dis 2 V R2 C2 SGND 2 Pwr GND 2 Figure 1. Block diagra.