L6258EX STMicroelectronics, L6258EX Datasheet - Page 23

IC MOTOR DRIVER UNIV 36-PWRSOIC

L6258EX

Manufacturer Part Number
L6258EX
Description
IC MOTOR DRIVER UNIV 36-PWRSOIC
Manufacturer
STMicroelectronics
Type
Driverr
Datasheet

Specifications of L6258EX

Applications
DC Motor Driver, Stepper Motor Driver
Number Of Outputs
2/1
Current - Output
1.5A
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
Supply Current
15 mA
Mounting Style
SMD/SMT
Operating Temperature
150 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Operating Temperature
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
497-3702-5
E-L6258EX

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L6258EX
Figure 10. Electrical model of the load
The schematic now shows the equivalent circuit of the stepper motor including a sine wave
voltage generator of the Bemf. The Bemf voltage of the motor is not constant, its value
changes depending on the speed of the motor.
Increasing the motor speed the Bemf voltage increases:
Bemf = Kt · ω
where:
Kt is the motor constant
ω is the motor speed in radiant per second
The formula defining the gain of the load considering the Bemf of the stepper motor
becomes:
we can see that the Bemf influences only the gain of the load block and does not introduce
any other additional pole or zero, so from the stability point of view the effect of the Bemf of
the motor is not critical because the phase margin remains the same.
Practically the only effect of the Bemf is to limit the gain of the total Aloop with a consequent
variation of the bandwidth of the system.
OUT+
OUT-
ACload dB
ACload
Acload
=
=
20
Vsense
-------------------- -
Vout
log
=
V S Bemf
---------------------------- -
V S Bemf
---------------------------- -
=
V S
(
--------------------------------------------------------------- -
V S Bemf
V S
R
L
R
Bemf
L
L
S
----------------------
R L
V S
----------------------
R L
R S
)
+
R S
+
R S
----------------------
R L
R S
R
+
PWM current control loop
S
R S
to Sense
Amplifier
23/32

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