XL33039

The XL/XD33039 are a high performance closed−loop speed control adapter. Usually used with XL33035 (a brushless DC motor controller), can build up a full closed−loop speed control system without need for magnetic or optical tachometer. It contains three input buffers each with hysteresis for noise immunity, three digital edge detectors, a programmable monostable, and an internal shunt regulator. Also included is an inverter output for use in systems that require conversion of sensor phasing. At each positive or negative transition of the Hall effect sensors, the XL/XD33039 generates a pulse with a fixed on time. The output signal can then be filtered to obtain a voltage proportional to motor speed.

Key features

• Low cost and few external components required
• Operation Down to 5.5 V for Direct Powering from XL33035 Reference
• TTL Compatible Inputs With Hysteresis
• Digital Detection of Each Input Transition for Improved Low Speed Motor Operation
• Internal Shunt Regulator Allows Operation from a Non−Regulated Voltage Source
• Inverter Output for between (60/300)° and (120/240)° Sensor Phasing Conventions
• Two Packages are Available: DIP8 (XD33039) and SOP8 (XL33039)