AMC8500 Datasheet, PDF (1/27 Pages) List of Unclassifed Manufacturers – TWO PHASE VARIABLE SPEED FAN MOTOR CONTROLLER

Preliminary Specification
aMC8500
TWO PHASE VARIABLE SPEED
FAN MOTOR CONTROLLER
Product Description
PRODUCT SPECIFICATION
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.
Features
• Analog and digital speed control signal compatibility
• Programmable minimum speed setting
• Selectable PWM speed control slope
• Latching PWM for enhanced noise immunity
• Integrated fault timer with auto start retry
• Motor kick start timer
• Combined frequency generator / rotor lock output
• Differential unbuffered and digital Hall compatibility
• Hall amplifier with propriety noise immunity circuitry
• Pinned out reference
• Uncommitted op amp for thermal sensor voltage scaling
• Fixed non-overlapping commutation delay
• Dual on-chip 0.5 Ω MOSFET motor drives
• Programmable cycle-by-cycle current limit protection
• Thermal shutdown protection
• Under voltage lockout protection
• Selectable automatic low current power down mode
Applications
• Personal computer fans
• Workstation and mainframe fans
• LAN server blowers
• Industrial control system fans
• Telcom system fans
• Instrumentation test and measurement fans
• Card rack fans
Pin Configuration
Phase 2
Output
Current
Limit Set
Hall +
Hall -
Reference
Output
Minimum
Speed Set
Non-Inverting
Input
Inverting
Input
1
16
2
15
3
14
4
13
aMC8500
5
12
6
11
7
10
8
9
Phase 1
Output
Freq Gen.
Rotor Lock
Slope Select
Power
Ground
V_DD
Signal
Ground
Speed Control
Input
Op Amp
Output
Application Diagram
12V
Ref.
Non-Inv.
Inv.
Output
V_DD
H+
H-
Ø1
Ø2
Reference
Op
Amp
Fault Timer
Commutation
Logic
Motor
Drive
Minimum
Speed
Speed
Control
PWM
Logic
Current
Limit
Slope Select
Signal Gnd
Power Gnd
FG / RL
Output
Current
Limit
Set
Ordering Information
Part Number
Package
Operating Junction
Temperature Range
aMC8500DE16
SOIC 16 Lead Exposed Pad
aMC8500QS16
Ayww – Assembly site year workweek
QSOP 16 Lead
-40°C to 125°C
© Andigilog, Inc. 2006
-1-
www.andigilog.com
Marking
aMC8500
Ayww
August 2006 - 70A04018