Test Equipment; Recommended Test Setup; Test Procedure - Texas Instruments TLVM13610EVM User Manual

Test Setup and Procedure

2.3 Test Equipment

Voltage Source: The input voltage source V
Multimeters:
• Voltmeter 1: Measure the input voltage at VIN S+ to VIN S–.
• Voltmeter 2: Measure the output voltage at VOUT S+ to VOUT S–.
• Ammeter 1: Measure the input current. Set the ammeter to 1-second aperture time.
• Ammeter 2: Measure the output current. Set the ammeter to 1-second aperture time.
Electronic Load: Use an electronic load set to constant-resistance (CR) or constant-current (CC) mode and
capable of 0 ADC to 6 ADC. For a no-load input current measurement, disconnect the electronic load as it can
draw a small residual current.
Oscilloscope: With the scope set to 20-MHz bandwidth and AC coupling, measure the output voltage ripple
directly across an output capacitor with a short ground lead normally provided with the scope probe. Place the
oscilloscope probe tip on the positive terminal of the output capacitor, holding the ground barrel of the probe
through the ground lead to the negative terminal of the capacitor. TI does not recommend using a long-leaded
ground connection because this can induce additional noise given a large ground loop. To measure other
waveforms, adjust the oscilloscope as needed.
Safety: Always use caution when touching any circuits that can be live or energized.

2.4 Recommended Test Setup

2.4.1 Input Connections
• Prior to connecting the DC input source, set the current limit of the input supply to 0.1-A maximum. Ensure
the input source is initially set to 0 V and connected to the VIN+ and VIN– connection points as shown in
Figure 2-1.
• Connect voltmeter 1 at VIN S+ and VIN S– connection points to measure the input voltage.
• Connect ammeter 1 to measure the input current and set it to at least a 0.1-second aperture time.
2.4.2 Output Connections
• Connect an electronic load to the VOUT+ and VOUT– connections as shown in
constant-resistance mode or constant-current mode at 0 A before applying input voltage.
• Connect voltmeter 2 at VOUT S+ and VOUT S– sense points to measure the output voltage.
• Connect ammeter 2 to measure the output current.

2.5 Test Procedure

2.5.1 Line, Load Regulation and Efficiency
• Set up the EVM as described in
• Set load to constant resistance or constant current mode to sink 0 A.
• Increase the input source voltage from 0 V to 24 V; use voltmeter 1 to measure the input voltage.
• Increase the current limit of the input supply to 8 A.
• Use voltmeter 2 to measure the output voltage, V
must remain within the load regulation specification.
• Set the load current to 4 A (50% rated load) and vary the input source voltage from 6 V to 36 V; V
remain within the line regulation specification.
• Set the load current to 8 A (100% rated load) and measure the efficiency at typical input voltages (12 V, 24 V,
and 36 V).
• Decrease the load to 0 A. Decrease the input source voltage to 0 V.
Extended operation at high output current can raise component temperatures above 55°C. To
avoid risk of a burn injury, do not touch the components until they have cooled sufficiently after
disconnecting power.
6 TLVM13610EVM Buck Regulator Evaluation Module
must be a 36-V variable DC source capable of supplying 6 A.
IN
Test Setup and Procedure.
, and vary the load current from 0-A to 8-A DC; V
OUT
CAUTION
Copyright © 2023 Texas Instruments Incorporated
www.ti.com
Figure 2-1. Set the load to
OUT
must
OUT
SLVUCN1 – JANUARY 2023
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