Preliminary Specification
- 1 -
© Andigilog, Inc. 2007
www.andigilog.com
April 2007 - 70A06005
SINGLE PHASE VARIABLE SPEED
ADVANCED FAN CONTROLLER
aMC8520
Product Description
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
Pin Configuration
aMC8520
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Phase 1
Phase 2
Bottom Drive
Bottom Drive
Phase 2
Phase 1
Top Drive
Top Drive
Signal Ground
VDD
Reference
VD Driver
Output
Current Sense
Hall -
Input
Hall +
Driver Ground
Minimum RPM
Signal Ground
Gain Amp
Output
Freq. Generator
Gain Amp
Input
Rotor Lock
Output
Thermistor
Control Input
Actual RPM
Output
PWM Control
Input
Control Loop
Compensation
Required RPM
Output
Low Temp
Maximum RPM
Ordering Information
Part Number
Package
Operating Junction Temperature Range
Marking
aMC85020QS24
24-lead QSOP
-40°C to 150°C
aMC8520
High Temp
Maximum RPM
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