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L292 Datasheet(PDF) 9 Page - STMicroelectronics

Part No. L292
Description  SWITCH-MODE DRIVER FOR DC MOTORS
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L292 Datasheet(HTML) 9 Page - STMicroelectronics

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L292
Figure 7. Open Loop Frequency Response
CLOSED-LOOP SYSTEM STEP RESPONSE
a) Small - signals analysis.
The transfer function (3) can be written as follows:
(7)
where wo =
is the cutoff frequency
is the dumping factor
By choosing the
ξ value, it is possible to determine the system response to an input step signal.
Examples :
1)
ξ = 1 from which t
(where Vi is the amplitude of the input step).
2)
ξ =
from which
I
M
V
I
----- s
()
0.044
R
s
---------------
1
s
2
ξω
o
--------------
+
1
2
ξss
2
+
ω
o ωo
2
----------------------
+
--------------------------------
=
G
mo Rs
R
4 CRF CF
----------------------------
ξ
R
4 C
4R
FCF Gmo Rs
---------------------------------------
=
I
M t
()
0.044
R
S
---------------
1e
t
2R
F CF
-------------------
1
t
4R
F CF
-------------------
+


V
i




=
1
2
-------
I
M t
()
0.044
R
s
--------------- 1
t
2R
F CF
------------------- e
t
2R
F CF
-------------------
cos




V
i
=


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