參數(shù)資料
型號: L6460TR
廠商: STMICROELECTRONICS
元件分類: 運(yùn)動控制電子
英文描述: STEPPER MOTOR CONTROLLER, PQFP64
封裝: 10 X 10 MM, 1 MM HEIGHT, ROHS COMPLIANT, TQFP-64
文件頁數(shù): 105/139頁
文件大?。?/td> 3837K
代理商: L6460TR
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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