L6460 datasheet(68/139 Pages) STMICROELECTRONICS

68 / 139 page

Power bridges

L6460

68/139

Doc ID 17713 Rev 1

An internal DAC is used to digitally control the output regulated current. The available values

are chosen to provide a quasi sinusoidal profile of the current. The current limit in each

phase is decided by PhADAC[3:0] bits for phase A and PhBDAC[3:0] bits for phase B. The

table below describes the relation between the value programmed in the stepper DAC and

the current level.

Note:

The min and max values are guaranteed by testing the percentage of VSTEPREF that

allows the commutation of the Rsense comparator.

IMAX=VSTEPREF/ RSENSE.

To obtain the best phase approximation of a sinusoidal wave, the user needs to repeat the

final (100%) value. So the full values sequence should be as follows: 0, 1, 2, 3 … D, E, F, F,

F, E, D … 3, 2, 1, 0.

Even if the total spread shows overlapping between current steps, the monotonicity is

guaranteed by design.

When the internal sequencer the minimum angle resolution is nominally 5.625°, so

depending on the control mode chosen, the selectable steps are Table 25.

Table 24.

DAC

PhXDAC [3:0]

Phase current ratio respect to IMAX

Min

Typ

Max

Unit

0000

(Hi-Z)

0001

9.8

% of IMAX

0010

19.5

% of IMAX

0011

29.0

% of IMAX

0100

38.3

% of IMAX

0101

47.1

% of IMAX

0110

55.6

% of IMAX

0111

63.4

% of IMAX

1000

70.7

% of IMAX

1001

77.3

% of IMAX

1010

83.1

% of IMAX

1011

88.2

% of IMAX

1100

92.4

% of IMAX

1101

95.7

% of IMAX

1110

98.1

% of IMAX

1111

IMAX

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