E-L6258EP STMICROELECTRONICS [STMicroelectronics], E-L6258EP Datasheet - Page 12
E-L6258EP
Manufacturer Part Number
E-L6258EP
Description
PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.E-L6258EP.pdf
(22 pages)
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L6258EP
so the gain of this block is:
where:
R
R
Because of the inductance of the motor L
Before analysing the error amplifier block and the sense transconductance block, we have to do this consider-
ation :
Aloop
Ax|
and
Bx|
this means that Ax|dB is the sum of the power amplifier and load blocks;
Ax|
The BODE analysis of the transfer function of Ax is:
Figure 7.
12/22
L
S
= equivalent resistance of the motor winding
dB
dB
dB
= sense resistor
dB
= ACpw|
= ACerr|
= (29,5) + (-31.4) = -1.9dB
= Ax
dB
dB
dB
+ Bx
+ ACsense|
+ ACload|
dB
dB
dB
Aload
Fpole
ACload
ACload
dB
L
, the load has a pole at the frequency :
Fpole
=
=
20
---------------------------------------- -
6.28
dB
=
⋅
log
=
V
----------------- -
=
⋅
v
sense
----------------------- -
12
12 10
-------------------------------- -
2π
1
out
----------------------- -
12
20
+
⋅
0.33
⋅
+
⋅
-------------------- -
R
0.33
log
0.33
1
=
L
–
L
3
+
-------------------- -
R
-------------------- -
R
L
R
L
=
L
R
=
R
S
+
+
S
163Hz
S
R
–
R
31.4dB
S
S