DRV8320_17 Datasheet, PDF (43/89 Pages) Texas Instruments – 6 to 60-V Three-Phase Smart Gate Driver

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High-Side
V_DS Monitor
VDS
+
±
(SPI only)
CSA_FET = 0
LS_REF = 0
SOx
Low-Side
V_DS Monitor
VDS
+
±
0
1
10 k
10 k
AV
10 k
VM
VDRAIN
GHx
SHx
GLx
SPx
R_SENSE
SNx
GND
DRV8320, DRV8320R
DRV8323, DRV8323R
SLVSDJ3A – FEBRUARY 2017 – REVISED APRIL 2017
High-Side
V_DS Monitor
VDS
+
±
VM
VDRAIN
GHx
(SPI only)
CSA_FET = 1
SHx
LS_REF = X
Low-Side
V_DS Monitor
VDS
+
±
0
GLx
1
10 k
10 k
SPx
SOx
AV
10 k
SNx
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.
The LMR16006 device can operate at high duty cycles because of the boot UVLO and then refreshs the wimp
MOSFET. The output voltage can be stepped down to as low as the 0.8-V reference. The internal soft-start
feature minimizes inrush currents.
For additional details and design information refer to LMR16006 SIMPLE SWITCHER® 60 V 0.6 A Buck
Regulators With High Efficiency Eco-mode.
Copyright © 2017, Texas Instruments Incorporated
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