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參數資料
| 型號： | AMC8500DE16 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | TWO PHASE VARIABLE SPEED FAN MOTOR CONTROLLER |
| 中文描述： | 兩相流變速風扇電機控制器 |
| 文件頁數： | 16/27頁 |
| 文件大小： | 648K |
| 代理商： | AMC8500DE16 |
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P
P
Preliminary Specification
- 16 -
Andigilog, Inc. 2006
www.andigilog.com
August 2006 - 70A04018
aMC8500
Figure 31- Driving Single Phase Full Wave Motors
Figure 32- Current Limit Threshold Programming, Noise Pick Up and Motor Soft Acceleration
Single phase full wave motors can be driven with the addition of two external P-channel MOSFETs. With the gates cross coupled as
shown above, the internal and external MOSFETs can perform as a full bridge driver. Commutation shoot through current is minimized by
the internal non-overlapping delay circuit. The resistor capacitor time constant must be just long enough to prevent pulse width modulation
of the two external PFETs. Current limit protection is maintained since the load is in series with the internal MOSFETs. The motor drive
outputs are limited to a maximum of 36 V.
The Current Limit Set input is susceptible to noise pick up and in most applications will require a 10 nF bypass capacitor. The Current
Limit Comparator threshold can be reduced by connecting a single resistor from Pin 2 to ground. This is the most economical
programming method but it is somewhat less accurate than using the dual resistor method shown. This is due to the fact that the
Reference Output is more accurate than the absolute values of the internal current source pull-up and terminating resistor. Motor soft
acceleration during power-up can be accomplished by connecting a capacitor from Pin 2 to ground. During initial device power-up, the
internal current source will charge capacitor C
thus gradually increasing the current limit threshold. The diode shown is optional and
may not be required if there is sufficient time for the internal components to discharge the capacitor from when the power source is
removed and then reapplied.
Hall Amplifier
Non-Overlap
Commutation
Motor
Drives
16
1
12
12 V
H
3
4
Under Voltage
Lockout
N
S
N
M
S
10 k
10 k
10
k
10
k
0.1
0.1
Current Limit
Comparator
Current
Limit
Latch
R
Q
S
13
2
Current
Limit
Set
10
μ
A
110 k
To V
M
To V
ref
Soft Motor
Acceleration
Current Limit
Threshold Reduction
Single Resistor
Current Source
Biased
Dual Resistor
Reference
Biased
C
accl
10 nF
Bypass
Capacitor
Noise
Pick Up
Elimination
Optional
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