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參數(shù)資料
| 型號： | L6460TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運動控制電子 |
| 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)： | 98/139頁 |
| 文件大小： | 3837K |
| 代理商： | L6460TR |
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L6460
Power bridges
Doc ID 17713 Rev 1
61/139
14.1.2
Parallel configuration (super bridge)
Bridges 1, 2, 3 and 4 can be configured to be used two by two (1 plus 2, 3 plus 4) as one
super bridge thus enabling the driving of loads (motors) requiring high currents. In this
configuration the half bridges will be paralleled and will work as one phase of the super-
bridge just created: the two phases + will become phase + of the newly created super-
bridge while the two phases - will become phase –.
Figure 16.
Super bridge configuration
When this configuration is chosen for bridges 1 (3) and 2 (4), the resulting bridge will use the
driving logic of bridge 1 (3) so for programming it must be used the bridge 1 (3) control and
status bits (direction, PWM, ...): i.e. the used PWM signal will be chosen by
Mtr1SideAPwmSel[1:0] (Mtr3SideAPwmSel[1:0]) bits in SPI.
If the bridges are not configured to be used in parallel, each side of the bridge will use the
PWM selected by the respective MtrXPWMYSel[1:0] bits in the SPI, but if one of the two
drivers is configured as a full bridge only one of the two selected PWM will be used to drive
the motor and this is the PWM chosen for side A.
In order to avoid any problem coming from different propagation times of PWM signals the
anti-crossover dead times are slightly increased when the bridges are paralleled.
14.1.3
Half bridge configuration
Each bridge can be configured to be used as 2 independent half bridges or as 1 super half
bridge (see Figure 17). It is also possible to parallel more than one bridge and use all of
them as a single super half bridge.
PH
-
PH
+
PH
+
PH
-
M
Bridge 2 (4)
Super Bridge
Bridge 1 (3)
PH
-
PH
+
PH
+
PH
-
M
Bridge 2 (4)
Super Bridge
Bridge 1 (3)
Parallel Full Bridge
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