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L8229 Datasheet(PDF) 34 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) 34 Page - STMicroelectronics

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SPI programming
L8229
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value is reached, synchronous rectification is turned off, so the outputs are placed in Hi-Z
state until the end of Toff. Please note that a typical 50mA reverse current could be present
during Active Sync rectification.
SYNC OFF means that the current will recirculate through the body diodes in parallel with
power DMOS. This is intended to allow the user to use external Schottky diodes to save the
internal dissipation.
LOW SIDE means that the synchronous recirculation is forced only through the low side
power DMOS.
Please note that while the current reversal is always sensed, if required, the current level is
sensed only by means of Rsense, so no current control is performed when current flows
away from Rsense, as in SLOW recirculation.
Active and passive synchronous rectification modes are illustrated in the following drawing:
Figure 9.
Active and Passive synchronous rectification during Mixed Decay.
LA
ADgtS
ON
I2
I1
HB
ON
Drive Recirculat.
LA
ADgtS
ON
I2
I1
Active Sync during Slow decay
LB
ON
Drive
Recirculation
LA
ADgtS
ON
I2
I1
Passive Sync during Slow decay
LB
ON
Drive
Recirculation
Remains ON till end of Toff
LA
ON
I1
Passive Sync during Fast decay
HB
ON
Drive
Recirculation
ADgtS
Ilimit
Remains ON till end of Toff or
Ilimit reached
Hi-Z
Hi-Z
I2
Hi-Z
VS
+
-
ADgtS
HA
LA
HB
LB
I1
I2
+
-
BDgtS
+
-
Ilimit
VDAC
Active Sync during Fast decay
LA
ADgtS
ON
I2
I1
HB
ON
LA
ON
I2
I1
Active Sync during Slow decay
LB
ON
Drive
Recirculation
LA
ON
I2
I1
Passive Sync during Slow decay
LB
ON
Dri
R
Remains ON till end of Toff
LA
ON
I1
Passive Sync during Fast decay
HB
ON
Recir
lation
ADgtS
Ilimit
Remains ON till end of Toff or
Ilimit reached
Hi-Z
Hi-Z
I2
Hi-Z
Hi-Z
Hi-Z
VS
+
-
ADgtS
HA
LA
HB
LB
I1
I2
+
-
BDgtS
+
-
Ilimit
VDAC
+
-
ADgtS
HA
LA
HB
LB
I1
I2
+
-
BDgtS
+
-
Ilimit
VDAC
Active Sync during Fast decay



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