Test Setup and Results
5
SLUUC51A – June 2020 – Revised July 2020
Copyright © 2020, Texas Instruments Incorporated
BQ25790EVM (BMS027) Evaluation Module User's Guide
2
Test Setup and Results
2.1
Equipment
This section includes a list of supplies required to perform tests on the BQ25790EVM.
1.
Power Supplies for VBUS pin:
Power Supply #1 (PS1): A power supply capable of supplying up to
24 V at 3 A is required.
2.
Battery Simulator for BAT pin:
Load #1 (4-Quadrant Supply): A "Kepco" Load, BOP, 20-5M, DC 0 to
±20 V, 0 to ±5 A (or higher) or a Keithley 2450 3-A sourcemeter. 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.
3.
System load simulator for SYS pin:
Load #2( Electronic load set to constant resistance or Resistive
Load): 10
Ω
, 5 W (or higher)
4.
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.
5.
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.
6.
PC Communication Interface:
USB2ANY Interface Adapter (when using the GUI Composer
application) or EV2300/2400 USB-Based PC Interface Board (when using Battery Management
Studio).
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 TP21 (VBUS) and TP45 (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 TP27 (BAT) and TP46 (PGND) to measure the battery voltage as
seen from the BAT pins of the charger.
7. Connect a voltage meter across TP17 and TP18 (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 TP26 (SYS) and TP48 (PGND) to measure the system voltage as
seen from the SYS pins of the charger.
9. Install shunts as shown in
.
