Operation
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2
Operation
2.1
Quick Start List for Stand-Alone Operation
Follow these steps to use the DRV8412EVM stand-alone or when connecting it into existing circuits or
equipment. Connections to the EVM module can be made by inserting stripped wire for the power supplies
and output connections.
2.1.1
Power Supply
Two power supplies are required to power up the EVM. One is needed for system power, logic and gate
drive, while the second is for the output stage power supply. Please use enough wire gauge such that the
impedance is relatively low. The output stage supply should use at least AWG 22 wire.
Table 2. Power Supply Requirements
Description
Voltage Range
Current Requirements
Wire Size
System Power Supply
12 V
1 A
26 AWG
Output Stage Power Supply
0 – 50 V
6 A
22 AWG
2.1.2
Evaluation Module Preparation
Inputs and Outputs
1. Ensure that all external power sources are set to OFF.
2. Connect load(s) across the outputs (OUTX) or between the outputs and ground depending on the
configuration requirement.
3. Connect an external 12V power supply to the terminal block marked GVDD and GND (J2). Make sure
the wires are connected with correct polarities.
4. Connect an external regulated power supply adjustable from 0V - 50V to the terminal block marked
PVDD and GND (J5). Make sure the wires are connected with correct polarities.
Control Signals
1. Install the mode jumpers on M3, M2, and M1 depending on the mode desired. See "Mode Pin
Configurations" table for detail.
2. Set RESET_AB (S1) and RESET_CD (S2) switches to low (RESET) position.
3. Prepare the PWM signals needed to control the power stage and make sure that PWM logic is 3.3V
not 5V.
2.1.3
Power Up
The DRV8412 device doesn't require a special power up sequence, but the following sequence is
recommended for the EVM.
1. Turn on GVDD (12V) power supply.
2. Enable PWM signals.
3. Set RESET_AB (S1) and RESET_CD (S2) switches to high (NORMAL OPERATION) position.
4. Turn on the external PVDD power supply to the desired voltage gradually.
5. Adjust the duty cycle of PWM input signals to the desired value. The EVM should begin to operate
normally.
2.1.4
Fault Conditions
When device shuts down due to any fault conditions, flip RESET_AB and/or RESET_CD switches back
and forth to clear the fault and reset the device. If this doesn't work for any reason, turn 12V GVDD power
supply off and on again to clear the latch. Please inspect the board and test condition carefully to
understand the problem before next operation.
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DRV8412EVM Motor Drive Evaluation Board
SLOU287 – January 2010
Copyright © 2010, Texas Instruments Incorporated