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L8229 Fiches technique(PDF) 37 Page - STMicroelectronics

No de pièce L8229
Description  Dual DMOS full bridge stepper/DC motor driver
PDF  42 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L8229 Fiches technique(HTML) 37 Page - STMicroelectronics

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4) LOW SIDE recirculation has only one case:
9.5
Slow Decay
When in Slow Decay, Active Synchronous rectification can't be used since current is not
expected to be reversed because of BEMF. Therefore only Passive, Off or Low side
recirculation cases can be selected.
1) ACTIVE SYNC recirculation is not allowed.
2) PASSIVE SYNC recirculation
3) SYNC OFF
4) LOW SIDE is identical to PASSIVE SYNC.
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 on
LB on
SLOW SYNC recirculation till end of Toff.
HA off
HB off
LA off
LB on
Anticross state (slow recirculation through the 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.
HA off
HB off
LA off
LB on
Anticross state (slow recirculation through LA body diode and
LB DMOS).
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 the 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.
HA off
HB off
LA off
LB on
Slow recirculation (through the 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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