Texas Instruments LP8754EVM, User Manual

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Quick Setup Guide
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2.2 Power Supply Setup
To power up the EVM, one power supply is needed. For full-load testing of the LP8754EVM, a DC-power
supply capable of at least 10 A and 4 V is required. 5 A is suggested as a practical minimum for partial
load. The power supply is connected to the EVM using connector X3. The power supply and cabling must
present low impedance to the UUT; the length of power supply cables must be minimized. Remote sense,
using connector X4, can be used to compensate for voltage drops in the cabling.
With the power supply disconnected from the UUT, set the supply to 3.7 V DC and the current limit to 5-A
minimum. Set the power supply output OFF. Connect the power supply's positive terminal (+) to VIN and
negative terminal (-) to GND on UUT (X3 Power-in terminal block). Check that jumpers on the boards are
set as shown in
Figure 1 (factory default jumper configuration).
Set power supply output ON, and then continue with the following steps.
1. On Evaluation software GUI, click on Assert VIOSYS. See Figure 3 : Marking “1”.
2. Click on Assert NRST. See Figure 3 : Marking “2”.
3. Click on Read Registers button. You should see ready message on green background next to the
Read Registers button. See Figure 3 : Marking “3”.
4. Check that the GUI indicates "PWM" under "Mode" and "Master; 1/6 Phases Active" under "Multi-
phase" status. See Figure 3 : Marking “4”.The EVM is now ready for testing with default register
settings loaded.
Figure 3. Evaluation Software GUI Showing Steps Needed to Power up the LP8754
6 The LP8754 Evaluation Module SNVU369 – August 2014
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