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A4941 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A4941 Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 9 page Description The A4941 three-phase motor driver incorporates BEMF sensing to eliminate the requirement for Hall sensors in fan applications. A pulse wave modulated (PWM) input is provided to control motor speed, allowing system cost savings by eliminating external variable power supply. PWM input can also be used as an on/off switch to disable motor operation and place the IC into a low power standby mode. TheA4941 is provided in a 16-pin TSSOP package (suffix LP) with an exposed thermal pad. It is lead (Pb) free, with 100% matte tin leadframe plating. A4941-DS, Rev. 4 Features and Benefits • Sensorless (no Hall sensors required) • Soft switching for reduced audible noise • Minimal external components • PWM speed input • FG speed output • Low power standby mode • Lock detection • Optional overcurrent protection • Variant A automotive qualified to AEC-Q100 Grade 2 Three-Phase Sensorless Fan Driver Package: 16-pin TSSOP with exposed thermal pad (suffix LP) Functional Block Diagram Not to scale A4941 Charge Pump VCP CP1 CP2 OCP 12 V 25 kHz Timers +VINT Control Logic Soft Switch OSC Startup OSC CDCOM FCOM Adaptive Commutation Delay Sequencer (Direction) 0.1 μF 0.1 μF OUTA OUTB M 3-Phase Half Bridges OUTC SENSE GND 0.167 Ω 10 kΩ VBB O/C FG FC TEST PWM SLEW VBB 10 μF CTAP GND BEMF Comparator OUTA OUTB OUTC |
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