L6460 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6460' PDF : 139 Pages View PDF
Power bridges
L6460
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.
Table 24. DAC
PhXDAC [3:0]
Min
0000
0001
-
0010
-
0011
-
0100
-
0101
-
0110
-
0111
-
1000
-
1001
-
1010
-
1011
-
1100
-
1101
-
1110
-
1111
-
Phase current ratio respect to IMAX
Typ
Max
(Hi-Z)
9.8
-
19.5
-
29.0
-
38.3
-
47.1
-
55.6
-
63.4
-
70.7
-
77.3
-
83.1
-
88.2
-
92.4
-
95.7
-
98.1
-
IMAX
-
Unit
% of IMAX
% of IMAX
% of IMAX
% of IMAX
% of IMAX
% of IMAX
% of IMAX
% of IMAX
% of IMAX
% of IMAX
% of IMAX
% of IMAX
% of IMAX
% of IMAX
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.
68/139
Doc ID 17713 Rev 1
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