Table of Contents
Advertisement
voltage level for the high-side gate driver. A bootstrap capacitor under voltage protection circuit
(BST_UVP) will start under this circumstance to prevent the potential failure of the high-side
MOSFET. In this circumstance, both the FAULT and OTW pins should pull low and the device
should self-protect itself. The motor's inductance and the inverter's bootstrap capacitance will
allow the DRV830x to run efficiently until approximately 10 kHz (with margin). Setting the PWM
switching frequency below 10 kHz may cause issues on the inverter output and is not
recommended. Please reference the datasheet.
Hardware Overview
The example projects made available with the kit may be done with a supplied 24V power supply,
but many of the examples will work with an externally supplied laboratory power supply of a
different voltage or current limit. The DRV830x EVM has all the power and control blocks that
constitute a typical motor drive system for a three-phase system: Communications + Control +
Feedback + Feedforward + Drive
Macro Blocks
The motor control board is separated into functional groups that enable a complete motor drive
system, these are referred to as macro blocks. Following is a list of the macro blocks present on
the board and their functions:
•
controlCARD socket – Socket for a controlCARD (preferably using built-in emulation).
•
DC Bus Connection
"PVDD/GND" Terminals – Connect an external 8-60V DC lab supply here
o
making sure to observe correct polarity..
•
DRV830x – This module includes either the DRV8301 or DRV8302 Three Phase Pre-
Driver as well as all of the necessary external passive components.
•
Current Sense – Low-side shunt current sensing on each half-bridge.
•
Quadrature Encoder Connections – Connections are available for an optional shaft
encoder to interface to the MCU's QEP peripheral.
•
Hall Effect Sensor Connections – Connections are available for optional Hall Effect
Sensors.
Fig 2, illustrates the position of these macro blocks on the board. The use of a macro block
approach, for different power stages enables easy debug and testing of one stage at a time. All
the PWM's and ADC signals which are the actuation and sense signals have designated test
points on the board, which makes it easy for an application developer to try out new algorithms
and strategies.
6
Advertisement
Table of Contents
