L292 STMicroelectronics, L292 Datasheet - Page 10
L292
Manufacturer Part Number
L292
Description
IC DC MOTOR DRIVER MULTIWATT15V
Manufacturer
STMicroelectronics
Type
Driverr
Datasheet
1.L292.pdf
(13 pages)
Specifications of L292
Applications
DC Motor Driver
Number Of Outputs
1
Current - Output
±2A
Voltage - Supply
18 V ~ 36 V
Operating Temperature
-40°C ~ 150°C
Mounting Type
Through Hole
Package / Case
Multiwatt-15 (Horizontal, Bent and Staggered Leads)
Operating Temperature Classification
Automotive
Motor Controller Type
DC Motor Driver
Package Type
MULTIWATT V
Operating Supply Voltage (max)
36V
Operating Supply Voltage
18 V to 36 V
Mounting Style
Through Hole
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Load
-
Lead Free Status / Rohs Status
Compliant
Other names
497-1388-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
L292
Figure 8. Small Signal Step Response (normalized amplitude vs. t / R
V
I
t = 100 s/div. with V
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
(6), the maximum value of
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 :
The module of the transfer function is :
The cutoff frequency is derived by the expression (9) by putting
10/13
I
----- s
V
M
I
-----
V
M
7
M
I
I
= 100 mA/div.
= 200 mV/div.
=
=
0.044
-------------- -
R
0.044
-------------- -
s
R
s
--------------------------------------------------------------------------------------------------------------------- -
--------------------------------------------------------------------- -
1
1
+
value, the rise-time of the current decreases. But for a good stability, from relationship
+
2s R
2 R
I
= 1.5 Vp.
1
F
C
+
F
F
C
2 1
sR
+
F
is:
F
2s
2
C
+
+
2
F
min
R
1
2
F
R
2
C
F
T
=
2
1 2
F
C
=
------------- -
2
2
–
4
F
1
-------------- -
R
2
0.9
F
2
R
C
F
(phase margin = 45°)
F
C
F
2
f
+
T
1
=
---------------------- -
2 R
0.9
I
-----
V
F
M
C
I
F
= 0.707 ·
F
C
F
).
0.044
-------------- -
R
s
(-3 dB), from which:
(8)
(9)