Datasheet

Test Setup

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5.1.7 Oscilloscope

A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope must be set

for 1-MΩ impedance, 20-MHz bandwidth, AC coupling, 2-µs/division horizontal resolution, 50-mV/division

vertical resolution. Test points TP27 and TP37 can be used to measure the output ripple voltage for CPU

and GPU. Do not use a leaded ground connection as this can induce additional noise due to the large

ground loop.

5.2 Recommended Wire Gage

1. V5in to J31 (5-V input):

The recommended wire size is 1 x AWG 18 per input connection, with the total length of wire less than

4 feet (2- foot input, 2-foot return).

2. 12VBAT to J30 (12-V input):

The recommended wire size is 1 x AWG 16 per input connection, with the total length of wire less than

4 feet (2-foot input, 2-foot return).

3. J1, J5, J6 (CPU) to LOAD or J11 (GPU) to LOAD or J28 (VDDQ) to LOAD or J24 (VCCIO) to

LOAD

The minimum recommended wire size is 2 x AWG 16, with the total length of wire less than 4 feet

(2-foot output, 2-foot return)

5.3 Recommended Test Setup

Figure 17 is the recommended test setup to evaluate the TPS59640EVM-751. Working at an ESD

workstation, ensure that any wrist straps, bootstraps, or mats are connected referencing the user to earth

ground before handling the EVM.

Using the TPS59640EVM-751 IMVP-7, 3-Phase CPU/1-Phase GPU SVID SLUU796–January 2012

Power System

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