IC MOTOR DRIVER UNIV 36-PWRSOIC

L6258EX

Manufacturer Part NumberL6258EX
DescriptionIC MOTOR DRIVER UNIV 36-PWRSOIC
ManufacturerSTMicroelectronics
TypeDriver
L6258EX datasheet
 


Specifications of L6258EX

ApplicationsDC Motor Driver, Stepper Motor DriverNumber Of Outputs2/1
Current - Output1.5AVoltage - Load12 V ~ 40 V
Voltage - Supply4.75 V ~ 5.25 VMounting TypeSurface Mount
Package / CasePowerSO-36 Exposed Bottom PadOperating Supply Voltage12 V to 40 V
Supply Current15 mAMounting StyleSMD/SMT
Operating Temperature150 CLead Free Status / RoHS StatusLead free / RoHS Compliant
Operating Temperature-Other names497-3702-5
E-L6258EX
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L6258EX
Before analysing the error amplifier block and the sense transconductance block, we have to
do this consideration:
Aloop
= Ax
+ Bx
dB
dB
Ax|
= ACpw|
dB
dB
and
Bx|
= ACerr|
dB
dB
this means that Ax|dB is the sum of the power amplifier and load blocks;
Ax|
= (29,5) + (-31.4) = -1.9dB
dB
The BODE analysis of the transfer function of Ax is:
Figure 7.
Ax bode plot
The Bode plot of the Ax|dB function shows a DC gain of -1.9dB and a pole at 163Hz.
It is clear now that (because of the negative gain of the Ax function), Bx function must have
an high DC gain in order to increment the total open loop gain increasing the bandwidth too.
3.4
Error amplifier and sense amplifier
As explained before the gain of these two blocks is:
Bx
= ACerr
+ ACsense
dB
dB
Being the voltage across the sense resistor the input of the Bx block and the error amplifier
voltage the output of the same, the voltage gain is given by:
dB
+ ACload|
dB
+ ACsense|
dB
dB
ib
=
Vsense
Gs
PWM current control loop
1
------- -
=
Vsense
Rb
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