L6258 datasheet(7/18 Pages) STMICROELECTRONICS

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Input Logic (I0 - I1 - I2 - I3)

The current level in the motor winding is selected

according to this table:

Current level

% of IMAX

No Current

9.5

HLH

19.1

28.6

38.1

LHL

47.6

55.6

LLL

63.5

HHH

71.4

77.8

HLH

82.5

88.9

92.1

LHL

95.2

98.4

LLL

100

Phase Input ( PH )

The logic level applied to this input determines

the direction of the current flowing in the winding

of the motor.

High level on the phase input causes the motor

current flowing from OUT_A to OUT_B through

the load.

Triangular Generator

This circuit generates the two triangular waves

TRI_0 and TRI_180 internally used to generate

the duty cycle variation of the signals driving the

output stage in bridge configuration.

The frequency of the triangular wave defines the

switching frequency of the output, and can be ad-

justed by changing the capacitor connected at

TR1_CAP pin :

Fref

where : K = 2 x 10

-5

DAC

VDAC

ERROR AMPL.

INPUT TRANSCONDUCTANCE

AMPL.

LOAD

OUTA

OUTB

VREF

Gin=1/Ra

VSENSE

Gs=1/Rb

Tri_180

POWER AMPL.

SENSE TRANSCONDUCTANCE

AMPL.

D97IN625

Tri_0

Figure 2. Current Control Loop Block Diagram

L6258

7/18

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