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參數(shù)資料
| 型號： | L8229 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 1.5 A, PDSO24 |
| 封裝： | LEAD FREE, SSO-24 |
| 文件頁數(shù)： | 27/42頁 |
| 文件大?。?/td> | 858K |
| 代理商： | L8229 |
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Product(s)
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Product(s)
L8229
SPI programming
9.3
Decay Modes and Synchronous Rectification
For stepping motor drive, the recirculation mode during Toff could be slow, fast or mixed
(that is fast followed by slow decay): W2, by means of bit 3 (for Out1) and bit 4 (for Out2),
allows to select MIXED or SLOW decay for bridge 1 and bridge 2 respectively; by selecting
(with W1, bits 9 to 12) Tfast longer than Toff, it is possible to select FAST decay for all the
Toff duration.
For DC motor drive, W2 bit 15 allows to choose slow or fast decay.
During the decay, it is possible for the current to flow through the intrinsic body diodes of the
LDMOS or through switched on LDMOS channel (in this case the current conduction will be
reversed from Source to Drain). This switching on of the active device in parallel with the
diode is called SYNCHRONOUS rectification and means that the recirculation path is not
obtained only through the internal diodes but also by turning on the DMOS in parallel with
the diode needed to recirculate current; because of the low RDSon of this LDMOS the
dissipation is reduced.
For stepping motors only with W1, by means of bits 13 and 14, it is possible to choose
several kinds of SYNCHRONOUS recirculation modes: ACTIVE recirculation, PASSIVE
recirculation, SYNC OFF recirculation, and LOW SIDE recirculation.
ACTIVE means that the current is monitored to avoid reverse current in the load: this could
happen because of FAST SYNC recirculation (that reverse the conduction of the bridge).
When a reverse current is detected, synchronous rectification is turned off, so the outputs
are placed in Hi-Z state until the end of Toff. Please note that Active Synchronous
rectification can't be used when in Slow Decay mode.
PASSIVE means that the current is not monitored to avoid a reverse current in the load. In
this case the current, during Toff, could be inverted and no action is taken until the current
reaches the current limit selected by the user by means of Vref and Rsense. When this
Table 33.
Stepping decay mode selected by W2
Bit 3 (4)
Mode
0
Mixed decay
1
Slow decay
Table 34.
DC decay mode selected by W2
Bit 15
Mode
0Slow
1Fast
Table 35.
Sync rectification selected by W1
Bit 14
Bit 13
Mode
00
Active(1)
1.
Only for Mixed Decay mode.
0
1
Passive
10
Off
1
Low side
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