2 Test Setup and Results
2.1 Equipment
This section includes a list of supplies required to perform tests on the BQ25672EVM.
•
Power Supplies for VBUS pin:
Power Supply #1 (PS1): A power supply capable of supplying up to 24 V at
3 A is required.
•
Battery Simulator for BAT pin:
Load #1 (4-Quadrant Supply): A Kepco Load, BOP, 20-5M, DC 0 to ±20 V,
0 to ±6 A (or higher) or a Keithley 2450 3-A source meter. When using both, a 1000-µF or higher, low ESR,
25-V rated or higher connected at the EVM battery and ground terminals is recommended.
Alternative Option: A 0–20 V/0–5 A, > 60-W DC electronic load set in a constant voltage loading mode in
parallel with a second power supply can be used. The second power supply is set to a voltage slightly below
the electronic load's constant voltage setting. When enabled, the charger's charge current then replaces the
current provided the second power supply.
•
System load simulator for SYS pin:
Load #2( Electronic load set to constant resistance or Resistive Load):
10 Ω, 5 W (or higher)
•
Meters:
(6x) "Fluke 75" multimeters, (equivalent or better).
Alternative Option: (4x) equivalent voltage meters and (2x) equivalent current meters. The current meters
must be capable of measuring at least 5 A. If used in series between the PS#1, Load#1 or Load#2, the
meters should be set for manual not auto ranging. Current meters add significant series resistance which
affects charger performance.
•
Computer:
A computer with at least one USB port and a USB cable. A valid internet connection is required
when using the GUI Composer application.
•
PC Communication Interface:
EV2300/2400 USB-Based PC Interface Board (when using Battery
Management Studio) or USB2ANY interface adapter (when using TI Charger GUI).
2.2 Equipment Setup
Use the following list to set up the EVM testing equipment. Refer to
for the test setup connections to
the EVM:
1. Review the EVM connections in
.
2. Set PS#1 for 5.0-V, 3-A current limit and then turn off the supply. Connect PS#1 to J1 (VIN1 and PGND).
3. Connect a voltage meter across TP23 (VBUS) and TP44 (PGND) to measure the input voltage as seen from
the VBUS pins of the charger.
4. Connect a voltage meter across TP1 and TP2 (I_VAC1_SENSE) to measure the input current into the VBUS
pins through the VIN1 path. Alternatively, you may connect a current meter between PS1 and J1.
5. Set Load #1 to constant voltage mode, capable of sinking (for example, compliance) at least 3 A, and output
to 5.0 V, and then disable load. Connect Load #1 to J5 (BATTERY and PGND).
6. Connect a voltage meter across TP29 (BAT) and TP46 (PGND) to measure the battery voltage as seen from
the BAT pins of the charger.
7. Connect a voltage meter across TP19 and TP20 (I_BAT_SENSE) to measure the battery charge current out
of and discharge current into BAT pins. Alternatively, you may connect a current meter between Load #1 and
J5.
8. Connect a voltage meter across TP28 (SYS) and TP45 (PGND) to measure the system voltage as seen
from the SYS pins of the charger.
9. Install shunts as shown in
.
Test Setup and Results
SLUUCF3A – DECEMBER 2020 – REVISED OCTOBER 2021
BQ25672 Evaluation Module
7
Copyright © 2021 Texas Instruments Incorporated
