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A8904
Three-Phase Brushless DC Motor Controller/Driver with Back-EMF Sensing
Features
- Pin-for-pin replacement for A8902CLBA
- Start-up commutation circuitry
- Sensorless commutation circuitry
- Option of external sector data tachometer signal
- Option of external speed control
- Oscillator operation up to 20 MHz
- Programmable overcurrent limit
- Transconductance gain options: 500 mA/V or 250 mA/V
- Programmable watchdog timer
- Directional control
- Serial port interface
- TTL-compatible inputs
- System diagnostics data-out ported in real time
- Dynamic braking through serial port or external terminal
Description
The A8904 is a 3-phase brushless DC motor controller/driver designed for applications where accurate control of high-speed motors is required. The three half-bridge outputs are low on-resistance, N-channel DMOS devices capable of driving up to 1.2 A. The A8904 provides complete, reliable, self-contained back EMF sensing, motor start-up, and running algorithms. A programmable digital frequency-locked loop speed control circuit together with the linear current control circuitry provides precise motor speed regulation.
A serial port allows the user to program various features and modes of operation, such as the speed control parameters, start-up current limit, sleep mode, direction, and diagnostic modes.
The A8904 is fabricated in the Allegro® BCD (Bipolar CMOS DMOS) process, an advanced mixed-signal technology that combines bipolar, analog, and digital CMOS, with DMOS power devices.
The device is provided in a 24-pin wide-body SOIC package, with 4 internally-fused leads for enhanced thermal dissipation (package LB), and a thin (<1.2 mm overall height), 28-pin TSSOP package with an exposed thermal pad Package LP). Both packages are lead (Pb) free, with 100% matte tin leadframe plating.
Functional Block Diagram
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