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參數(shù)資料
| 型號： | TDA7272A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | High Performance Motor Speed Regulator(高性能電機(jī)調(diào)速器) |
| 中文描述： | 高性能電機(jī)調(diào)速器（高性能電機(jī)調(diào)速器） |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 192K |
| 代理商： | TDA7272A |
The TDA7272A novel applied solution is based
on a tachometer control system without using
such extra tachometer system. The information of
the actual motor speed is extracted from the mo-
tor itself. ADC motorwith an odd number of poles
generates a motor current which contains a fixed
number of discontinuities within each rotation. (6
for the 3 pole motorexample on fig.1)
Deriving this inherent speed information from the
motor current, it can be used as a replacement of
a low resolution AC tachometer system. Because
the settling time of the control loop is limited on
principle by the resolution in time of the tachome-
Figure1:
Equivalent of a 3Pole DC Motor (a) and Typical motor Current Waveform (b).
ter, this control principle offers a poor reaction
time for motors with a low number of poles. The
realized circuit is extended by a second feed for-
ward loop in order to improve such system by a
fastauxiliary control path.
This additional path senses the mean output cur-
rent and varies the output voltage according to
the voltage drop across the inner motor resis-
tance. Apart from a current averaging filter, there
is no delay in such loop and a fast settling behav-
iour is reached in addition to the long term speed
motoraccuracy.
ELECTRICALCHARACTERISTICS
(Continued)
Symbol
CURRENT SENSE AMPLIFIER
R
8
Input Resistance
G
L
Loop Gain
TRIGGER AND MONOSTABLE STAGE
V
IN1
Input Allowed Voltage
R
IN1
Input Resistance
V
T Low
Trigger Level
V
T B
Bias Voltage (pin 1)
V
T H
Trigger Histeresis
V
2 REF
Reference Voltage
SPEED PROGRAMMING, DIRECTION CONTROL LOGIC AND CURRENT SOURCE PROGRAMMING
V
18,19Low
Input Low Level
V
18,19 High
Input High Level
I
18,19
Input Current
0 < V
18,19
< V
S
V
17,20 REF
Reference Voltage
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
100
K
9
-0.7
3
V
V
mV
mV
mV
500
0
20
10
800
15
25
750
850
0.7
V
V
μ
A
mV
2
2
735
800
865
TDA7272A
4/16
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