DRV8320_17 Datasheet, PDF (36/89 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
The high-side V_DS monitors measure the voltage between the VDRAIN and SHx pins. In devices with three
current-shunt amplifiers (DRV8323 and DRV8323R), the low-side V_DS monitors measure the voltage between the
SHx and SPx pins. If the current shunt amplifier is unused, tie the SP pins to the common ground point of the
external half-bridges. On device options without the current shunt amplifiers (DRV8320 and DRV8320R) the low-
side V_DS monitor measures between the SHx and SLx pins.
For the SPI devices, the low-side V_DS monitor reference point can be changed between the SPx and SNx pins if
desired with the LS_REF register setting.
The V_{VDS_OCP} threshold is programmable between 0.06 V and 1.88 V. Additional information on the V_DS monitor
levels are described in the Register Maps section for SPI devices and in the Pin Diagrams section hardware
interface device.
VDS
+
±
VDS
+
±
V_{VDS_OCP}
VM
VDRAIN
GHx
VDS_±⁺
VDS_±⁺
V_{VDS_OCP}
VM
VDRAIN
GHx
VDS
+
±
+
VDS_±
V_{VDS_OCP}
SHx
GLx
VDS_±⁺
+
VDS _±
V_{VDS_OCP}
SHx
GLx
SLx
PGND
Figure 28. DRV8320 and DRV8320R V_DS Monitors
0
1
LS_REF
(SPI Only)
SPx
R_SENSE
SNx
PGND
Figure 29. DRV8323 and DRV8323R V_DS Monitors
8.3.1.4.5 VDRAIN Sense Pin
The DRV832x family of devices provides a separate sense pin for the common point of the high-side MOSFET
drain. This pin is called VDRAIN. This pin allows the sense line for the overcurrent monitors (VDRAIN) and the
power supply (VM) to remain separate and prevent noise on the VDRAIN sense line. This separation also allows
for a small filter to be implemented on the gate driver supply (VM) or to insert a boost converter to support lower
voltage operation if desired. Care must still be taken when the filter or separate supply is designed because VM
is still the reference point for the VCP charge pump that supplies the high-side gate drive voltage (V_GSH). The VM
supply must not drift to far from the VDRAIN supply to avoid violating the V_GS voltage specification of the external
power MOSFETs.
8.3.2 DVDD Linear Voltage Regulator
A 3.3-V, 30-mA linear regulator is integrated into the DRV832x family of devices and is available for use by
external circuitry. This regulator can provide the supply voltage for a low-power microcontroller or other low-
current supporting circuitry. The output of the DVDD regulator should be bypassed near the DVDD pin with a
X5R or X7R, 1-µF, 6.3-V ceramic capacitor routed directly back to the adjacent AGND ground pin.
The DVDD nominal, no-load output voltage is 3.3 V. When the DVDD load current exceeds 30 mA, the regulator
functions like a constant-current source. The output voltage drops significantly with a current load greater than 30
mA.
36
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