L6258E STMicroelectronics, L6258E Datasheet - Page 18
L6258E
Manufacturer Part Number
L6258E
Description
IC MOTOR DRIVER UNIV 36-PWRSOIC
Manufacturer
STMicroelectronics
Type
DMOS Dual Full Bridge Driverr
Datasheet
1.E-L6258E.pdf
(31 pages)
Specifications of L6258E
Applications
DC Motor Driver, Stepper Motor Driver
Number Of Outputs
2/1
Current - Output
1.2A
Voltage - Load
12 V ~ 40 V
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Surface Mount
Package / Case
PowerSO-36 Exposed Bottom Pad
Operating Supply Voltage
12 V to 40 V
Mounting Style
SMD/SMT
Operating Temperature
150 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Operating Temperature
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
497-1433-5
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PWM current control loop
3.3
18/31
Moreover, having the two references Tri_0 and Tri_180 a triangular shape it is clear that the
transfer function of this block is a linear constant gain without poles and zeros.
Load attenuation
The load block is composed by the equivalent circuit of the motor winding (resistance and
inductance) plus the sense resistor.
We will considered the effect of the Bemf voltage of the motor in the next chapter.
The input of this block is the PWM voltage of the power amplifier and as output we have the
voltage across the sense resistor produced by the current flowing into the motor winding.
The relation between the two variable is:
so the gain of this block is:
where:
R
R
Because of the inductance of the motor L
L
S
= equivalent resistance of the motor winding
= sense resistor
Aload dB
Fpole
ACload dB
ACload
V sense
ACpw
Fpole
=
Doc ID 8688 Rev 9
=
--------------------------------------------- -
6.28
dB
20
=
=
⋅
=
=
V sense
-------------------- -
=
⋅
----------------------
R L
log
---------------------------------- -
2π
v
V
20
12
-------------------------- -
20
12
out
1
L
out
+
----------------------- -
12
, the load has a pole at the frequency:
⋅
⋅
⋅
⋅
R S
+
0.33
-------------------- -
R
log
+
10
log
1
0.33
L
0.33
=
⋅
L
–
+
2
---------------- -
----------------------
R L
L
3
R S
----------------------
R
R
1.6
⋅
L
R S
S
=
R S
+
24
=
+
163Hz
R S
R
–
=
31.4dB
S
29.5dB
L6258E