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L292 Datasheet(PDF) 10 Page - STMicroelectronics

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

L292 Datasheet(HTML) 10 Page - STMicroelectronics

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L292
10/13
Figure 8. Small Signal Step Response (normalized amplitude vs. t / RFCF).
V7 = 200 mV/div.
IM = 100 mA/div.
t = 100
µs/div. with VI = 1.5 Vp.
It is possible to verify that the L292 works in "closed-loop" conditions during the entire motor current rise-
time: the voltage at pin 7 inverting input of the error amplifier) is locked to the reference voltage VR,
present at the non-inverting input of the same amplifier.
The previous linear analysis is correct for this example.
Descresing the
ξ value, the rise-time of the current decreases. But for a good stability, from relationship
(6), the maximum value of
ξ is:
(phase margin = 45°)
b) Large signal reponse
The large step signal response is limited by slew-rate and inductive load.
In this case, during the rise-time of the motor current, The L292 works is open-loop condition.
CLOSED LOOP SYSTEM BANDWIDTH.
A good choice for x is the value 1 / Ö2. In this case :
(8)
The module of the transfer function is :
(9)
The cutoff frequency is derived by the expression (9) by putting
= 0.707 ·
(-3 dB), from which:
ξmin
1
2
4
2
--------------
=
I
M
V
I
----- s
()
0.044
R
s
---------------
1sR
F CF
+
12s R
F CF
2s
2
R
F
2
C
F
2
++
----------------------------------------------------------------------
=
I
M
V
I
-----
0.044
R
s
---------------
21
ω
2
R
F
2
C
F
2
+
12
ωR
F CF
+
()
2
1
+
[]
12
ωR
FCF
()
2
1
+
[]
----------------------------------------------------------------------------------------------------------------------
=
I
M
V
I
-----
0.044
R
s
---------------
ω
T
0.9
R
F CF
---------------
f
T
0.9
2
πR
F CF
-----------------------
==


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