Datasheet

Added Resistor

Cut This Trace

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Setup

1.3.3 Loop Response Measurement

The loop response of the TLV621x0EVM-505 can be measured with two simple changes to the circuitry.

First, install a 10-Ω resistor across the pads in the middle of the back of the PCB. The pads are spaced to

allow installation of 0805- or 0603-sized resistors. Second, cut the trace between the via on the output

voltage and the trace that connects to the VOS pin via. These changes are shown in Figure 1. With these

changes, an ac signal (10-mV, peak-to-peak amplitude recommended) can be injected into the control

loop across the added resistor.

Figure 1. Loop Response Measurement Modification

2 Setup

This section describes how to properly use the TLV621x0EVM-505.

2.1 Input/Output Connector Descriptions

J1 – VIN Positive input connection from the input supply for the EVM. Use when the steady-

state input current is less than 1 A. Otherwise, use J8.

J2 – S+/S– Input voltage sense connections. Measure the input voltage at this point.

J3 – GND Return connection from the input supply for the EVM. Use when the steady-state

input current is less than 1 A. Otherwise, use J8.

J4 – VOUT Output voltage connection. Use when the steady-state output current is less than 1

A. Otherwise, use J9.

J5 – S+/S– Output voltage sense connections. Measure the output voltage at this point.

J6 – GND Output return connection. Use when the steady-state output current is less than 1

A. Otherwise, use J9.

J7 – PG/GND The PG output appears on pin 1 of this header with a convenient ground on pin 2.

J8 – VIN/GND Pin 1 is the positive input connection with pin 2, serving as the return connection.

Use this terminal block if the steady-state input current is greater than 1 A.

J9 – VOUT/GND Pin 2 is the output voltage connection with pin 1, serving as the output return

connection. Use this terminal block if the steady-state output current is greater

than 1 A.

J10 – SS/TR & GND The SS/TR input appears on pin 1 of this header with a convenient ground on pin

JP1 – EN EN pin input jumper. Place the supplied jumper across ON and EN to turn on the

IC. Place the jumper across OFF and EN to turn off the IC.

JP2 – DEF DEF pin input jumper. Place the supplied jumper across HIGH and DEF to set the

output voltage at 5% above nominal. Place the jumper across LOW and DEF to

set the output voltage at the nominal level.

SLAU416A–January 2012–Revised July 2013 TLV62130EVM-505 and TLV62150EVM-505 Evaluation Modules

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