AMC8520 Datasheet, PDF (1/2 Pages) List of Unclassifed Manufacturers – SINGLE PHASE VARIABLE SPEED ADVANCED FAN CONTROLLER

Preliminary Specification
aMC8520
Product Description
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.
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
Applications
• PC, workstation and mainframe fans
• Telecom, LAN server fans and blowers
• Industrial control and instrumentation fans
Ordering Information
Pin Configuration
Phase 1
Bottom Drive
1
24
Phase 2
Top Drive
2
23
Signal Ground 3
22
Reference
Output
4
21
Hall - 5
20
Hall +
Minimum RPM
Gain Amp
Output
Gain Amp
Input
Thermistor
Control Input
Control Loop
Compensation
Low Temp
Maximum RPM
6
19
aMC8520
7
18
8
17
9
16
10
15
11
14
12
13
Part Number
aMC85020QS24
Package
24-lead QSOP
Operating Junction Temperature Range
-40°C to 150°C
Phase 2
Bottom Drive
Phase 1
Top Drive
V_DD
V_D Driver
Current Sense
Input
Driver Ground
Signal Ground
High Temp
Maximum RPM
Freq. Generator
Rotor Lock
Output
Actual RPM
Output
PWM Control
Input
Required RPM
Output
Marking
aMC8520
© Andigilog, Inc. 2007
-1-
www.andigilog.com
April 2007 - 70A06005