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PDF AMC8500 Data sheet ( Hoja de datos )
| Número de pieza | AMC8500 | |
| Descripción | TWO PHASE VARIABLE SPEED FAN MOTOR CONTROLLER | |
| Fabricantes | Andigilog | |
| Logotipo |  |
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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
89
Phase 1
Output
Freq Gen.
Rotor Lock
Slope Select
Power
Ground
VDD
Signal
Ground
Speed Control
Input
Op Amp
Output
Application Diagram
12V
Ref.
Non-Inv.
Inv.
Output
VDD 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
1 page  
Preliminary Specification
aMC8500
100
80
60
40
Figure 1- Motor Drives Percent On-Time
versus Speed Control Input Voltage
Kick Start
1.0 sec.
Motor remains at min
speed setting. Auto
power down disabled.
IO(Ref) ≥2.0 mA
VDD = 12 V
Pin 14 = Gnd
TA = 25°C
Minimum speed set shown
for 1.5 V, 1.7 V, and 1.9 V.
20
0
0
Motor turns on/off at min
speed setting. Auto power
down enabled after 1 sec.
IO(Ref) ≤1.0 mA
1.0 2.0 3.0 4.0
Vin(SC), Speed Control Input Voltage (V)
5.0
100
80
60
Figure 2- Motor Drives Percent On-Time
versus Speed Control Input Voltage
Kick Start
1.0 sec.
VDD = 12 V
Pin 14 = Open
TA = 25°C
Motor remains at min
speed setting. Auto
power down disabled.
IO(Ref) ≥2.0 mA
40
Motor turns on/off at
min speed setting.
20
Auto power down
enabled after 1.0 sec.
IO(Ref) ≤1.0 mA
Minimum speed set shown
for 2.1 V, 2.3 V, and 2.5 V.
0
0 1.0 2.0 3.0 4.0 5.0
Vin(SC), Speed Control Input Voltage (V)
2.05
2.0
Figure 3- Op Amp
Small Signal Transient Response
VDD = 12 V
AV = +1.0
RL = 10 M
CL = 10 pF
TA = 25°C
1.95
1.0 μs/Division
Figure 4- Op Amp
Large Signal Transient Response
VDD = 12 V
2.5
AV = +1.0
RL = 10 M
CL = 10 pF
TA = 25°C
2.0
1.5
4.0 μs/Division
Figure 5- Op Amp Source and Sink
Output Voltage versus Current
0
-1.0
High state output
Load to ground
VDD VDD = 12 V
TA = 25°C
Figure 6- Frequency Generator / Rotor Lock
Low State Output Voltage versus Sink Current
1.0
VDD = 12 V
TA = 25°C
0.8
-2.0 0.6
2.0
1.0
0
0
Low state output
Load to VDD
Gnd
4.0 8.0 12
IO, Output Load Current (mA)
© Andigilog, Inc. 2006
0.4
0.2
0
16 0
-5-
www.andigilog.com
1.5 3.0 4.5
Isink, Sink Current (mA)
6.0
August 2006 - 70A04018
5 Page 
Preliminary Specification
aMC8500
Kick Start
Most DC motors exhibit a large difference between the voltage required to insure startup and minimum speed operation.
Figure 18 shows this difference as a hysteretic characteristic and is dependent upon bearing friction, lubrication,
temperature, and rotor inertia. With the majority of motor controllers presently available, the applied voltage for minimum
speed operation must be set equal to or greater than that required for startup. This limits the motors useful speed range from
about 35 to 100 percent even though most motors will operate down to 10 percent. In order to guarantee near minimum run
speed operation, the mechanical startup hysteresis must be overcome. This is accomplished in the aMC8500 by kick starting
the motor in a controlled manner where full power is initially applied for a for a prescribed time, and control then reverts back
to the level that is dictated by either the Speed Control or Minimum Speed Set input. This is graphically shown in Figures 1
and 2. With reliable starting guaranteed, the useful speed range is increased by approximately 25%, yielding lower speed
operation for reduced acoustic noise and extended motor life.
Figure 18- Typical DC Motor Startup and Run Characteristics
100
Kick Start 100% Voltage
1.0 Second
80
Kick Start Extended
Speed Range
60
40
20
0
0
Typical Useful Speed Range
20 40 60 80
%ton, Motor Drives Percent On-Time (%)
Minimum Startup Speed
35% On-Time
Minimum Run Speed
10% On-Time
100
The Kick Start time, ton(KS), is internally set to 1.0 second and is automatically activated whenever the motor is at rest and
commanded to run, or when it is under a command to run and one of the following events takes place:
1) Device comes out of power down mode
2) Rotor was locked and the obstruction has cleared
3) Device recovered from a thermal shutdown
4) Device comes out of an under voltage lockout condition
Current Limit
Abnormally high drive current conditions can occur if the motor is mechanically overloaded and may result in device and
the drive coil overheating. During motor overload, any reduction in rotational speed reduces the generated back
electromotive force, EMF, resulting in an corresponding increase in drive current. The most severe condition occurs when
the rotor is locked and there is no back EMF generated. Under this condition, the drive current is limited only by the
resistance total of the MOSFET switch and the driven coil. In order to protect the device and motor from abnormally high
currents, a programmable Current Limit Comparator is incorporated. The comparator indirectly senses the drive current and
when a maximum level is exceeded, the motor drive on-time is immediately terminated on a cycle-by-cycle basis of either the
internal oscillator or the digital control signal applied to the Speed Control Input.
The current limit threshold defaults to a peak current of 1.1 A with Pin 2 open. This level can be reduced by either applying
a bias voltage to Pin 2 or by connecting a single resistor from this pin to ground. Figures 11 and 12 show the current limit
behavior while Figure 32 illustrates two biasing methods. The Current Limit Set input is high impedance and in most
applications will require a 10 nF bypass capacitor to prevent false triggering due to noise pick up.
© Andigilog, Inc. 2006
- 11 -
www.andigilog.com
August 2006 - 70A04018
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet AMC8500.PDF ] | |
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