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A3938 Datasheet(PDF) 7 Page - Allegro MicroSystems

Part # A3938
Description  Three-Phase Power MOSFET Controller
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A3938 Datasheet(HTML) 7 Page - Allegro MicroSystems

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Three-Phase Power MOSFET Controller
A3938
7
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
VBB. Motor power supply connection for the A3938 and
for power MOSFETs. It is good practice to connect a decou-
pling capacitor from this pin to AGND, as close to the device
pins as possible.
REF
. Analog input to current limit comparator. Voltage
applied here sets the peak load current according to the fol-
lowing equation:
I
TRIP = VREF / RSENSE
LCAP
. 5 V reference to power internal logic and provide
low current for DEAD pin and FAULT pin. Connection for
0.1 μF external capacitor for decoupling.
DEAD. Analog input. A resistor between DEAD and LCAP
is selected to adjust turn-off time to turn-on time. This
delay is needed to prevent cross-conduction in the external
power MOSFETs. See the section Application Information
for details on setting dead time.
SENSE. Analog input to the current limit comparator.
Voltage representing load current appears on this pin. Voltage
transients that are seen at this pin when the drivers turn on
are ignored for period of time, t
BLANK.
AGND. Analog reference ground.
PGND. Return for low-side gate drivers. This should be
connected to the PCB power ground.
H1
H2
H3
DIR
GLA
GLB
GLC
GHA
GHB
GHC
SA
SB
SC
1
0
1
1001100
HI
Z
LO
1
0
0
1001010
Z
HI
LO
1
1
0
1100010
LO
HI
Z
0
1
0
1100001
LO
ZHI
0
1
1
1010001
Z
LO
HI
0
0
1
1010100
HI
LO
Z
1
0
1
0100001
LO
ZHI
1
0
0
0010001
Z
LO
HI
1
1
0
0010100
HI
LO
Z
0
1
0
0001100
HI
Z
LO
0
1
1
0001010
Z
HI
LO
0
0
1
0100010
LO
HI
Z
Commutation Truth Table
MODE
PWM
RESET
Quadrant
Mode of Operation**
0*
0
0
Fast decay
PWM chop – current decay with opposite of selected low-
side drivers ON.
0*
1
0
Fast Decay
Selected drivers ON. If current limiting, opposite of selected
low-side drivers ON.
1
0
0
Slow decay
PWM chop – current decay with both low-side drivers ON.
1
1
0
Slow Decay Selected drivers ON. If current limiting, both low-side drivers ON.
XX
1
X
All high-side drivers OFF, low-sides see BRKSEL stored.
Clears storable faults.
* Low-side, only, Synchronous Rectification mode.
**See Commutation Truth Table for meaning of “both” and "selected."
Input Logic


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