DRV8320_17 Datasheet, PDF (28/89 Pages) Texas Instruments – 6 to 60-V Three-Phase Smart Gate Driver

DRV8320, DRV8320R
DRV8323, DRV8323R
SLVSDJ3A – FEBRUARY 2017 – REVISED APRIL 2017
www.ti.com
8.3 Feature Description
Table 1 lists the recommended values of the external components for the gate driver. Table 2 lists the
recommended values of the external components for the buck regulator.
Table 1. DRV832x Gate-Driver External Components
COMPONENTS
C_VM1
C_VM2
C_VCP
C_SW
C_DVDD
R_nFAULT
R_SDO
R_IDRIVE
R_VDS
R_MODE
R_GAIN
C_VREF
R_ASENSE
R_BSENSE
R_CSENSE
PIN 1
VM
VM
VCP
CPH
DVDD
VCC ⁽¹⁾
VCC ⁽¹⁾
IDRIVE
VDS
MODE
GAIN
VREF
SPA
SPB
SPC
PIN 2
PGND
PGND
VM
CPL
AGND
nFAULT
SDO
AGND or DVDD
AGND or DVDD
AGND or DVDD
AGND or DVDD
AGND or DGND
SNA and PGND
SNB and PGND
SNC and PGND
RECOMMENDED
X5R or X7R, 0.1-µF, VM-rated capacitor
≥ 10 µF, VM-rated capacitor
X5R or X7R, 16-V, 1-µF capacitor
X5R or X7R, 47-nF, VM-rated capacitor
X5R or X7R, 1-µF, 6.3-V capacitor
Pullup resistor
Pullup resistor
DRV832x hardware interface
DRV832x hardware interface
DRV832x hardware interface
DRV832x hardware interface
Optional capacitor rated for VREF
Sense shunt resistor
Sense shunt resistor
Sense shunt resistor
(1) The VCC pin is not a pin on the DRV832x family of devices, but a VCC supply voltage pullup is required for the open-drain output
nFAULT and SDO. These pins can also be pulled up to DVDD.
Table 2. DRV832xR Buck Regulator External Components
COMPONENT
C_VIN
C_BOOT
D_SW
L_SW
C_OUT
R_FB1
R_FB2
PIN 1
VIN
SW
SW
SW
OUT ⁽¹⁾
OUT ⁽¹⁾
FB
PIN 2
BGND
CB
BGND
OUT ⁽¹⁾
BGND
FB
BGND
RECOMMENDED
X5R or X7R, 1 to 10 µF, VM-rated capacitor
X5R or X7R, 0.1-µF, 16-V capacitor
Schottky diode
Output inductor
X5R or X7R, OUT rated capacitor
Resistor divider to set buck output voltage
(1) The OUT pin is not a pin on the DRV8320R and DRV8323R devices, but is the regulated output voltage of the buck regulator after the
output inductor.
8.3.1 Three Phase Smart Gate Drivers
The DRV832x family of devices integrates three, half-bridge gate drivers, each capable of driving high-side and
low-side N-channel power MOSFETs. A doubler charge pump provides the proper gate bias voltage to the high-
side MOSFET across a wide operating voltage range in addition to providing 100% duty-cycle support. An
internal linear regulator provides the gate-bias voltage for the low-side MOSFETs. The half-bridge gate drivers
can be used in combination to drive a three-phase motor or separately to drive other types of loads.
The DRV832x family of devices implements a smart gate-drive architecture which allows the user to dynamically
adjust the gate drive current without requiring external gate current limiting resistors. Additionally, this
architecture provides a variety of protection features for the external MOSFETs including automatic dead-time
insertion, parasitic dV/dt gate turnon prevention, and gate-fault detection.
8.3.1.1 PWM Control Modes
The DRV832x family of devices provides four different PWM control modes to support various commutation and
control methods. Texas Instruments does not recommend changing the MODE pin or PWM_MODE register
during operation of the power MOSFETs. Set all INHx and INLx pins to logic low before making a MODE or
PWM_MODE change.
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