Preliminary Specification aMC8520 SINGLE PHASE VARIABLE SPEED ADVANCED FAN CONTROLLER The aMC8520 is a full featured single phase brushless DC motor controller that contains all the required functions for an economical closed loop motor control solution that fulfills the balanced technology extended (BTX) requirements allowing a significant reduction of acoustic noise generation. Unique features of this device are a pulse width modulation (PWM) speed control input that is compatible with industry standard digital temperature monitors, thermistor input with adjustable gain and minimum temperature response threshold for temperature monitoring, programmable high and low temperature maximum RPM, programmable minimum RPM, current output error amplifier for easy control loop compensation. Additional features include a latching PWM for enhanced noise immunity, integrated fault timer with auto start retry, adaptive motor start timer to insure start up, combined frequency generator / rotor lock output, Hall amplifier with propriety noise immunity circuitry for proper drive sequencing, compatibility with differential non-buffered and buffered sensors, pinned out reference for Hall and circuit bias, fixed non-overlapping commutation delay for reduced power supply current spiking, two 40 V open drain top drivers, two 100 mA complementary MOSFET bottom drivers, programmable cycle-by-cycle current limiting, under voltage lockout and thermal shutdown protection, and an internal shunt regulator for use with higher voltage motors. Pin Configuration Features • PWM closed loop speed control compatible with industry standard digital temperature monitors • Thermistor input with adjustable gain and minimum temperature response threshold • Programmable high and low temperature maximum RPM • Programmable minimum RPM • Current output error amp for easy loop compensation • Differential unbuffered and digital Hall compatibility with propriety noise immunity circuitry • Integrated fault timer with auto start retry • Adaptive motor start timer • Combined frequency generator / rotor lock output • Pinned out reference for Hall and circuit bias • Fixed non-overlapping commutation delay • Two 40 V open collector top drivers • Two 100 mA complementary MOSFET bottom drivers • Programmable cycle-by-cycle current limit protection • Under voltage lockout and thermal shutdown protection • Internal shunt regulator for higher voltage motors Phase 1 Bottom Drive 1 24 Phase 2 Bottom Drive Phase 2 Top Drive 2 23 Phase 1 Top Drive Signal Ground 3 22 VDD Reference Output 4 21 VD Driver Hall - 5 20 Current Sense Input Hall + 6 19 Driver Ground aMC8520 Applications Minimum RPM 7 18 Signal Ground Gain Amp Output 8 17 High Temp Maximum RPM Gain Amp Input 9 16 Freq. Generator Rotor Lock Output Thermistor Control Input 10 15 Actual RPM Output Control Loop Compensation 11 14 PWM Control Input Low Temp Maximum RPM 12 13 Required RPM Output • PC, workstation and mainframe fans • Telecom, LAN server fans and blowers • Industrial control and instrumentation fans Ordering Information Part Number Package Operating Junction Temperature Range Marking aMC85020QS24 24-lead QSOP -40°C to 150°C aMC8520 © Andigilog, Inc. 2007 -1www.andigilog.com April 2007 - 70A06005 Preliminary Specification – Subject to change without notice Preliminary Specification – Subject to change without notice Product Description Preliminary Specification aMC8520 Top View End View Side View Detail ‘A’ View Dimensions are in inches © Andigilog, Inc. 2007 -2www.andigilog.com April 2007 - 70A06005 Preliminary Specification – Subject to change without notice Preliminary Specification – Subject to change without notice QSOP 24 Package Outline Drawing