a8906clb Allegro MicroSystems, Inc., a8906clb Datasheet
a8906clb
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a8906clb Summary of contents
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... The A8906CLB is a bidirectional three-phase brushless dc motor controller/driver. The three half-bridge outputs are low on-resistance n- channel DMOS devices capable of driving The A8906CLB provides complete, reliable, self-contained back-EMF sensing motor startup and running algorithms. A programmable digital frequency- locked loop speed control circuit together with the linear current control circuitry provides precise motor speed regulation ...
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... BLANK WATCHDOG TIMER CHARGE PUMP MUX TSD 6°C/W 125 150 Dwg. GP-019B 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1999 Allegro MicroSystems, Inc. C RES BRAKE 11 12 BOOST CHARGE BRAKE PUMP LOAD 1 SUPPLY OUT A 8 ...
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Characteristic Symbol Logic Supply Voltage Logic Supply Current Load Supply Voltage Thermal Shutdown Thermal Shutdown Hysteresis Output Drivers Output Leakage Current Total Output ON Resistance r (Source + Sink + Output Sustaining Voltage V Clamp Diode Forward ...
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BIDIRECTIONAL 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER Characteristic Symbol C Current I WD CWD C Threshold Voltage Max. FLL Oscillator Frequency f OSC I (MAX) OUT BRAKE Threshold V BRAKE Hysteresis Current I BRKL Transconductance Gain g ...
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Term. Terminal Name 1 LOAD SUPPLY OUT A 6-7 GROUND 8 OUT B 9 OUT C 10 CENTERTAP 11 BRAKE 12 C RES 13 FILTER 14 SECTOR DATA 15 LOGIC ...
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... BIDIRECTIONAL 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER Power Outputs. The power outputs of the A8906CLB are n-channel DMOS transis- tors with a total source plus sink r DS(on) typically 1 Ω. Internal charge pump boost circuitry provides voltage above supply for driving the high-side DMOS gates. Intrinsic ...
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Adaptive Commutation Delay. The adaptive commutation delay circuit uses the back-EMF zero-crossing indicator signal (FCOM) to determine an optimal commuta- tion time for efficient synchronous operation. This circuit commutates the outputs, delayed from the last zero crossing, using two external ...
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... CHARGE ERROR FAST PUMP FROM FLL Speed Control. The A8906CLB includes a frequency-locked loop speed control system. This system monitors motor speed via internal or external digital tachometer signals, generates a precision speed reference, determines the digital speed error, and corrects the motor current via an internal charge pump and external filtering components on the FILTER terminal ...
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... Serial Port. The serial port functions to write various operational and diagnostic modes to the A8906CLB. The serial port DATA IN is enabled/disabled by the CHIP SELECT terminal. When CHIP SE- LECT is high the serial port is disabled and the chip is not affected by changes in data at the DATA IN or CLOCK terminals. ...
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... FAULT Braking. A dynamic braking feature of the A8906CLB shorts the three motor windings to ground. This is accomplished by turning the three source drivers OFF and the three sink drivers ON. Activation of the brake can be implemented through the BRAKE input. The supply voltage for the brake circuitry is the C function to remain active after power failure ...
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BSC 0.5985 0.0926 0.1043 0.0040 MIN . 24 13 7.60 7.40 0. 1.27 15.60 0.33 BSC 15.20 2.65 2.35 0.10 MIN . NOTES: 1. Webbed lead ...
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... BIDIRECTIONAL 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibil- ity for its use ...