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L8229 数据表(PDF) 36 Page - STMicroelectronics

部件名 L8229
功能描述  Dual DMOS full bridge stepper/DC motor driver
PDF  42 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L8229 数据表(HTML) 36 Page - STMicroelectronics

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2) - PASSIVE SYNC recirculation could be divided in following cases:
2a) The reverse current (if present) does not exceed the regulated value
(Note: this case is identical to ACTIVE SYNC case 1a)
2b) The reverse current exceeds the regulated value during FAST
recirculation.
(Note: if the current exceed the regulated value during SLOW recirculation, no
action is taken and the behaviour will be that of case 2a)
3) - SYNC OFF recirculation has only one case:
HA on
HB off
LA off
LB on
Current increasing in the load.
All off
Anticross state (fast recirculation through LA and HB body
diodes).
HA off
HB on
LA on
LB off
FAST SYNC recirculation through DMOS till end of fast decay
time.
HA off
HB off
LA on
LB off
Anticross state (fast recirculation through LA DMOS and HB
body diode).
HA off
HB off
LA on
LB on
SLOW SYNC recirculation till end of Toff.
HA off
HB off
LA off
LB on
Anticross state (slow recirculation through LA body diode and
LB DMOS).
HA on
HB off
LA off
LB on
Current increasing in the load.
HA on
HB off
LA off
LB on
Current increasing in the load.
All off
Anticross state (fast recirculation through LA and HB body
diodes).
HA off
HB on
LA on
LB off
FAST SYNC recirculation through DMOS till reverse current
reaches the regulated value).
All off
Hi-Z state till end of Toff.
HA on
HB off
LA off
LB on
Current increasing in the load.
HA on
HB off
LA off
LB on
Current increasing in the load.
All off
Fast recirculation through LA and HB body diodes till end of
fast decay time.
HA off
HB off
LA off
LB on
Slow recirculation through LA body diode and LB DMOS till
end of Toff.
HA on
HB off
LA off
LB on
Current increasing in the load.



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