Operation

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2.4

Other Components

R8

R8 is listed as not installed on the schematic and in the bill of materials. It does not need to be

installed for the EVM to work properly. Installing a 0-

Ω resistor at R8 ties EN to VDET. In this mode, a

drop in the EXT SVS voltage, below approximately 2.35 V, disables the LDO-1 and LDO-2 outputs.

WARNING

Uninstall the jumper at JP1 before installing R8. Never have any

jumper on JP1 while there is a resistor installed at R8.

C1

A place to install an extra input capacitor is provided at C1. This capacitor is listed as not installed on

the schematic and in the bill of materials. It does not need to be installed for the EVM to work properly.

C4

C4 programs the delay for the internal SVS-2 of LDO-2.

C5

Programs the soft-start ramp time for LDO-2.

C6

Programs the soft-start ramp time for LDO-1.

C7

C7 programs the delay for the internal SVS-1 of LDO-1.

2.5

Soldering Guidelines

Any solder re-work to modify the EVM for the purpose of repair or other application reasons must be

performed using a hot-air system to avoid damaging the IC.

2.6

Equipment Setup

Follow these procedures to properly set up the TPS75005EVM-023 equipment.

•

Turn off the input power supply after verifying that its output voltage is set to less than 6.5 V. Connect

the positive voltage lead from the input power supply to VIN at the J2 connector of the EVM. Connect

the ground lead from the input power supply to GND at the J3 connector of the EVM.

•

Turn off the SVS power supply after verifying that its output voltage is set to 2.5 V. Connect the

positive voltage lead from the SVS power supply to the EXT SVS input at the J1 connector of the EVM.

Connect the ground lead from the SVS power supply to GND at the J3 connector.

•

Connect a 0-mA to 500-mA load between the output VOUT1 at connector J6, and GND at connector

J7. Connect a 0-mA to 500-mA load between the output VOUT2 at connector J4, and GND at

connector J5.

3

Operation

This section provides information about the operation of the TPS75005EVM-023.

3.1

General Operation

•

Turn on the input power supply. For initial operation, it is recommended that the input power supply,

VIN

– J2, be set to 5 V.

•

Vary the respective loads and the VIN and EXT SVS voltages as necessary for test purposes.

4

TPS75005EVM-023

SBVU019A

– October 2011 – Revised October 2011

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