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DRV8714-Q1 Datasheet(PDF) 34 Page - Texas Instruments

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No. de pieza DRV8714-Q1
Descripción Electrónicos  DRV871x-Q1 Automotive Multi-Channel Smart Half-Bridge Gate Drivers With Wide Common Mode Current Sense Amplifiers
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Fabricante Electrónico  TI [Texas Instruments]
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DRV8714-Q1 Datasheet(HTML) 34 Page - Texas Instruments

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Digital Core
Level
Shifter
VVCP
GHx
SHx
VBAT
DRAIN
IDRVN
IDRVP
ISTRONG
IHOLD
VVCP
High-Side Gate Driver
VGS
+
±
VSH
+
±
VSH
+
±
VDRAIN
VPGNDx
VDS
+
±
VDRAIN
Threshold Detectors
Overcurrent Detector
Handshaking
Level
Shifter
VVCP
GLx
PGNDx
IDRVN
IDRVP
ISTRONG
IHOLD
VVCP
Low-Side Gate Driver
VGS
+
±
VDS
+
±
VSHx
Overcurrent Detector
Handshaking
GND
Figure 8-11. Gate Driver Functional Block Diagram
8.3.4.2 Slew Rate Control (IDRIVE)
The IDRIVE component of the smart gate drive architecture implements adjustable gate drive current control to
adjust the external MOSFET VDS slew rate. This is achieved by implementing adjustable pull up (IDRVP) and pull
down (IDRVN) current sources for the internal gate driver architecture.
The external MOSFET VDS slew rates are a critical factor for optimizing radiated and conducted emissions,
diode reverse recovery, dV/dt parasitic gate coupling, and overvoltage or undervoltage transients on the switch-
node of the half-bridge. IDRIVE operates on the principle that the VDS slew rates are predominantly determined
by the rate of the gate charge (or gate current) delivered during the MOSFET QGD or Miller charging region. By
allowing the gate driver to adjust the gate current, it can effectively control the slew rate of the external power
MOSFETs.
IDRIVE allows the DRV871x-Q1 to dynamically change the gate driver current setting through the IDRVP_x and
IDRVN_x SPI registers or IDRIVE pin on H/W interface devices. The device provides 16 settings between the
0.5-mA and 62-mA range for the source and sink currents as shown in Table 8-16. The peak gate drive current is
available for the tDRIVE duration. After the MOSFET is switched and the tDRIVE duration expires, the gate driver
switches to a hold current (IHOLD) for the pull up source current to limit the output current in case of a short circuit
condition and to improve the efficiency of the driver.
DRV8714-Q1, DRV8718-Q1
SLVSEA2 – AUGUST 2020
www.ti.com
34
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Product Folder Links: DRV8714-Q1 DRV8718-Q1


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