AMC8500

www.DataSheet4U.com Preliminary Specification aMC8500 TWO PHASE VARIABLE SPEED FAN MOTOR CONTROLLER Product Description The aMC8500 is a full featured monolithic brushless DC motor controller containing all the required functions to implement fan speed control. This device features a selectable slope pulse width modulator (PWM) for efficient speed control with analog and digital control signal compatibility, programmable minimum speed setting, Hall amplifier with propriety noise immunity circuitry for proper drive sequencing, fixed non-overlapping commutation delay for reduced supply current spiking, dual on-chip 0.5 Ω power MOSFETs with thermal protection for direct motor drive, programmable cycle-by-cycle current limiting, internal fault timer with auto start retry, motor kick start timer to insure start up, combined frequency generator / rotor lock output, uncommitted op amp with reference for thermal sensor voltage scaling, and a selectable automatic low current power down mode for power sensitive applications. PRODUCT SPECIFICATION Pin Configuration Phase 2 Output Current Limit Set Hall + 1 2 3 4 5 6 7 8 16 15 14 13 Phase 1 Output Preliminary Specification – Subject to change without notice Preliminary Specification – Subject to change without notice Freq Gen. Rotor Lock Slope Select Power Ground VDD Signal Ground Speed Control Input Op Amp Output Hall Reference Output Minimum Speed Set Non-Inverting Input Inverting Input aMC8500 12 11 10 9 Features ...