Datasheet

GPU

Host Computer

VCCIO

CPU

VDDQ

5Vin DC

Source

12VBAT DC

Source

Load

USB Cable

TEXAS

NSTRUMENTS

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Test Setup

Figure 17. TPS59640EVM-751 Recommended Test Setup

5.4 USB Cable Connections

A standard USB_A and 5-pin mini_B USB cable is required to connect the host computer to J42 USB port

(left bottom side). A green LED (D13) lights up near the USB port on the EVM. This indicates that the USB

cable is connected.

5.5 Input Connections

1. Prior to connecting the 5Vin DC source, it is advisable to limit the source current from 5 Vin to 1 A

maximum. Make sure that 5Vin is initially set to 0 V and connected as shown in Figure 17.

2. Prior to connecting the 12VBAT DC source, it is advisable to limit the source current from 12VBAT to

10 A maximum. Make sure that 12VBAT is initially set to 0 V and connected as shown in Figure 17.

3. Connect voltmeters V1 at TP72 (5Vin) and TP75 (GND) to measure 5Vin voltage, V2 at TP73 (12

VBAT), and TP21 (GND) to measure 12VBAT voltage as shown in Figure 17.

4. Connect a current meter A1 between 12VBAT DC source and J30 to measure the 12VBAT input

current.

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

Power System

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