E-L6258E データシートの表示（PDF） - STMicroelectronics

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E-L6258E

PWM controlled high current DMOS universal motor driver

STMicroelectronics 

ACpw dB

=

20 ⋅ log 2-----⋅---2----4-

1.6

=

29.5dB

L6258E

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.

3.3

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:

Vsense

=

-----V-----o---u----t-----

RL + RS

⋅

RS

so the gain of this block is:

ACload = V-----s---e----n---s----e-- = --------R----S----------

vout

RL + RS

ACloaddB

=

20 ⋅ log --------R----S----------

RL + RS

AloaddB

=

20 ⋅ log -------0---.--3---3---------

12 + 0.33

=

–31.4dB

where:

RL = equivalent resistance of the motor winding

RS = sense resistor

Because of the inductance of the motor LL, the load has a pole at the frequency:

Fpole = ---------------1-----------------

2π ⋅ --------L----L--------

RL + RS

Fpole = -------------------1--------------------- = 163Hz

6.28

⋅

-1---2-----⋅---1---0----–---3--

12 + 0.33

18/31

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