DRV8320 Datasheet, PDF (42/80 Pages) Texas Instruments – 6 to 60-V Three-Phase Smart Gate Driver

DRV8320, DRV8320R
DRV8323, DRV8323R
SLVSDJ3 – FEBRUARY 2017
www.ti.com
To enable this mode set the CSA_FET bit to 1. The positive input of the amplifier is then internally connected to
the SHx pin with an internal clamp to prevent high voltage on the SHx pin from damaging the sense amplifier
inputs. During this mode of operation, the SPx pins should be left disconnected. When the CSA_FET bit is set to
1, the negative reference for the low-side V_DS monitor is automatically set to SNx, regardless of the state of the
LS_REF bit state. This setting is implemented to prevent disabling of the low-side V_DS monitor.
If the system operates in MOSFET V_DS sensing mode, route the SHx and SNx pins with Kelvin connections
across the drain and source of the external low-side MOSFETs.
High-Side
V_DS Monitor
VDS
+
±
VM
VDRAIN
GHx
High-Side
V_DS Monitor
VDS
+
±
VM
VDRAIN
GHx
(SPI only)
CSA_FET = 0
LS_REF = 0
(SPI only)
CSA_FET = 1
SHx
SHx
LS_REF = X
Low-Side
V_DS Monitor
VDS
+
±
GLx
0
1
Low-Side
V_DS Monitor
VDS
+
±
0
GLx
1
10 k
10 k
SPx
10 k
10 k
SPx
SOx
AV
10 k
SOx
R_SENSE
AV
SNx
10 k
SNx
GND
GND
Figure 41. Resistor Sense Configuration
Figure 42. V_DS Sense Configuration
When operating in MOSFET V_DS sense mode, the amplifier is enabled at the end of the t_DRIVE time. At this time,
the amplifier input is connected to the SHx pin, and the SOx output is valid. When the low-side MOSFET
receives a signal to turn off, the amplifier inputs, SPx and SNx, are shorted together internally.
8.3.5 Step-Down Buck Regulator
The DRV8320R and DRV8323R have an integrated buck regulator (LMR16006) to supply power for an external
controller or system voltage rail. The LMR16006 device is a 60-V, 600-mA, buck (step-down) regulator.
The buck regulator has a very-low quiescent current during light loads to prolong battery life. The LMR16006
device improves performance during line and load transients by implementing a constant-frequency current-mode
control scheme which requires less output capacitance and simplifies frequency compensation design. The
LMR160006 is the LMR16006X device version that uses a 0.7-MHz switching frequency.
The LMR16006 device reduces the external component count by integrating the bootstrap recharge diode. The
bias voltage for the integrated high-side MOSFET is supplied by a capacitor on the CB to SW pin. The bootstrap
capacitor voltage is monitored by a UVLO circuit and turns off the high-side MOSFET when the boot voltage falls
below a preset threshold.
42
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