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L8229 Datasheet(PDF) 35 Page - STMicroelectronics

Part # L8229
Description  Dual DMOS full bridge stepper/DC motor driver
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L8229 Datasheet(HTML) 35 Page - STMicroelectronics

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The output states during these cases of recirculation could be summarized as below: (only
OUTA to OUTB current flowing is described)
9.4
Mixed Decay
1) ACTIVE SYNC recirculation could be divided in following cases.
1a) No reverse current detected during Toff
1b) Reverse current detected during Fast Recirculation of Toff
1c) Reverse current detected during Slow Recirculation of Toff
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 is
detected.
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
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 reverse current is detected.
All off
Hi-Z state till end of Toff.
HA on
HB off
LA off
LB on
Current increasing in the load.



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