A3932SEQ-TTR Allegro MicroSystems, Inc., A3932SEQ-TTR Datasheet - Page 5

• Manufacturer Part Number: A3932SEQ-TTR
• Description: IC MOSFET DRVR 5V DUAL HI/LO SIDE 3-PHASE BRDG 32PLCC T/R
• Manufacturer: Allegro MicroSystems, Inc.

3932
THREE-PHASE POWER
MOSFET CONTROLLER
— A logic input used to enable the device, internally
pulled up to V
(+5 V). A RESET = 1 will disable the
LCAP
device and force all gate drivers to 0 V, coasting the motor. A
RESET = 0 allows the gate drive to follow the commutation
logic. The RESET = 1 overrides BRAKE.
— Low-side, gate-drive outputs for external
NMOS drivers. External series-gate resistors (as close as
possible to the NMOS gate) can be used to control the slew rate
seen at the power-driver gate, thereby controlling the di/dt and
dv/dt of the SA/SB/SC outputs. GLx = 1 (or “high”) means that
the upper half (PMOS) of the driver is turned on and its drain
will source current to the gate of the low-side FET in the
external motor-driving bridge. GLx = 0 (or “low”) means that
the lower half (NMOS) of the driver is turned on and its drain
will sink current from the external FET’s gate circuit.
— Directly connected to the motor, these terminals
sense the voltages switched across the load. These terminals
are also connected to the negative side of the bootstrap capaci-
tors and are the negative supply connections for the floating
high-side drivers.
— High-side, gate-drive outputs for external
NMOS drivers. External series-gate resistors can be used to
control the slew rate seen at the power-driver gate, thereby
controlling the di/dt and dv/dt of the SA/SB/SC outputs.
GHx = 1 (or “high”) means that the upper half (PMOS) of the
driver is turned on and its drain will source current to the gate
of the high-side FET in the external motor-driving bridge. GHx
= 0 (or “low”) means that the lower half (NMOS) of the driver
is turned on and its drain will sink current from the external
FET’s gate circuit.
— High-side connections for the bootstrap capaci-
tors, positive supply for high-side gate drivers. The bootstrap
capacitors are charged to approximately V
when the
REG
associated output Sx terminal is low. When the output swings
high, the voltage on this terminal rises with the output to
provide the boosted gate voltage needed for n-channel power
MOSFETs.
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