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A3932SEQ Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer A3932SEQ
Beschreibung THREE PHASE POWER MOSFET CONTROLLER
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 8 Seiten
A3932SEQ Datasheet, Funktion
ADVANCED DATASHEET - 03/02/99
(Subject to change without notice)
3932
Page 1 of 8
THREE PHASE POWER
MOSFET CONTROLLER
GHC 5
CC 6
GLB 7
SB 8
GHB 9
CB 10
GLA 11
SA 12
GHA 13
A3932SEQ
29 SENSE
28 RC
27 PWM
26 TACH
25 SR
24 BRAKE
23 DIR
22 H2
21 H3
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Load Supply Voltage, VBB ............................ 50 V
VREG (Transient) ......................................... 15 V
Logic Input Voltage Range,
VIN...................-0.3 V to VLCAP + 0.3 V
Sense Voltage, VSENSE ........................ -5 to 1.5 V
Pins SA/SB/SC, ................................... -5 to 50 V
Pins GHA/GHB/GHC ................-5 to VBB + 17 V
Pins CA/CB/CC .........................SA/SB/SC+17 V
Package Power Dissipation (TA = +25°C)
RØJA ..................................... 52.4 °C/W
RØJC ..................................... 22.7 °C/W
PD ................................................2.4 W
Operating Temperature Range,
TA ................................-20°C to +85°C
Junction Temperature, TJ ......................... +150°C
Storage Temperature Range,
TS...............................-55°C to +150°C
The A3932SEQ is a three-phase brushless DC motor controller. The
A3932’s high current gate drive capability allows driving of a wide range of
power MOSFETs and can support motor supply voltages from 12 to 50V.
The A3932 integrates a bootstrapped high side driver to minimize the
external component count required to drive N-channel MOSFET drivers.
Internal fixed off time PWM current control circuitry can be used to
regulate the maximum load current to a desired value. The peak load current
limit is set by the user’s selection of an input reference voltage and external
sensing resistor. The fixed off time pulse duration is set by a user-selected
external RC timing network. For added flexibility, the PWM input can be
used to provide speed/torque control, allowing the internal current control
circuit to set a maximum current limit.
The A3932 includes optional synchronous rectification. This feature
will short out the current path through the power MOSFETs intrinsic body
diodes during PWM off cycle current decay. This can minimize power
dissipation in the MOSFETs, eliminate the need for external power clamp
diodes, and potentially allow a more economical choice for the MOSFET
drivers.
The A3932 provides commutation logic for Hall sensors configured
for 120-degree spacing. The Hall input pins are pulled up to an internally
generated 5V reference. Power MOSFET protection features includes gate-
source voltage monitor, bootstrap capacitor charging current monitor,
undervoltage monitor, motor lead short to supply or ground, and thermal
shutdown.
FEATURES
n Drives Wide Range of N-channel
MOSFETs
n Sources 1.25A for Gate Turn-On
n Sinks 2.5A for Gate Turn-Off
n Synchronous Rectification
n Power MOSFET Protection
n Adjustable Dead Time for Cross
Conduction Protection
n Fast/Slow Current Decay Modes
n Internal PWM current Control
n PWM Torque Control Input
n Motor Lead Short to Supply
and Ground Protection
n Internal 5V Regulator
n Direction Control
n Brake Input
n Fault Diagnostic Output
n Tachometer Output
n Thermal Shutdown
n Undervoltage Protection
n 32L PLCC Package
Always order by complete part number: A3932SEQ






A3932SEQ Datasheet, Funktion
Page 6
3932
THREE-PHASE POWER MOSFET CONTROLLER
PIN DESCRIPTIONS (continued)
VREG. Regulated 13 V output supply for low side gate
drive and bootstrap capacitor charge circuit. It is good
practice to connect a decoupling capacitor from this pin to
AGND, as close to the device pins as possible. Pin should be
shorted to VBB for 12V applications.
DEAD. Analog input. A resistor between DEAD and LCAP
is selected to adjust turn-off to turn-on time. This delay is
needed to prevent shoot-thru in the external power FET’s.
The resistor allowable range is 5.6k to 470k, which converts
to deadtime of 100ns to 5500ns.
VBB. Motor power supply connection for A3932 and power
MOSFETs. Pin should be shorted to VREG for 12V
applications.
TDEAD 11e-12 * RDEAD
AGND. Analog reference.
REF. Analog input to current limit comparator. Voltage
applied here sets the peak load current according to the
equation:
PGND. Return for low side gate drive. This should be
connected to PCB power ground.
ITRIP = VREF/RSENSE
LCAP. 5V reference to power internal logic, connection for
decoupling cap. This pin requires 1nF external capacitor for
decoupling and should not be used to power any external
circuitry.
Commutation Truth Table
H1 H2 H3 DIR GLA GLB GLC GHA GHB GHC SA SB SC
101
1
001
1
00
HI
Z LO
100
1
001010
Z
HI LO
110
1
1
0
0
0
1
0 LO HI
Z
010
1
1
0
0
0
0
1 LO
Z
HI
011
1
010001
Z LO HI
001
1
0
1
0
1
0
0
HI LO Z
101
0
1
0
0
0
0
1 LO
Z
HI
100
0
010001
Z LO HI
110
0
0
1
0
1
0
0
HI LO Z
010
0
001
1
00
HI
Z LO
011
0
001010
Z
HI LO
001
0
1
0
0
0
1
0 LO HI
Z
INPUT LOGIC
MODE
0
0
1
1
0
0
1
1
X
PWM
0
1
0
1
0
1
0
1
X
S/R RESET Quadrant Mode of Operation
0 0 Fast decay PWM chop– current decay, all drivers off
0 0 Fast Decay Peak Current limit – selected drivers ON
0 0 Slow decay PWM chop – current decay, selected Low side ON
0 0 Slow Decay Peak Current limit mode – selected drivers ON
1 0 Fast decay PWM chop – current decay with opposite of selected drivers ON
1 0 Fast Decay Peak Current limit – selected drivers ON
1 0 Slow decay PWM chop – current decay with both Low side drivers ON
1 0 Slow Decay Peak Current limit – selected drivers ON
X1
X All gate drive outputs to 0V – Clear fault logic

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