Use the following guidelines to set up the equipment:
- Set power supply 1 for 23 V DC, 8
A current limit and then turn off the supply.
- Connect the output of power
supply 1 in series with a current meter to J1 (VIN and PGND).
- Connect a voltage meter across J1
(VIN) and J1 (PGND).
- Connect load 1 in series with a
current meter to J3 (VBAT and PGND).
- Connect a voltage meter across J5
(VBAT and PGND).
- Set 23 V at KEPCO load output.
Limit KEPCO to 6 A. Use load 2 to power EVM from the VOUT output.
- Connect J5 to the EV2400. Connect
J5 to the I2C PORT 2 on the EV2400.
- Install the jumpers as indicated
in IO and Jumper Descriptions.
- Turn on the computer and load 2.
Open the bqStudio software.
- Select Charger and
click the Next button.
- Select
Charger_1_00_BQ25750.bqz on the Select a Target
Page.
- Click Field View
after selecting the target device and then click the Read
Register button.
- Set WATCHDOG and EN_CHG to
disabled.
- Set ICHG_REG to 4000 mA and
IPRECHG to 1000 mA in the 16 Bit Registers field.
- Turn on power supply 1, measure:
V(J1(VAC)) = 23 V ± 0.5
V
I(J1(IAC)) = 4.1 A ±
0.5 A
V(J3(VBAT)) = 23 V ± 0.5 V I(J3(IBAT)) = 3.9 A ± 0.5
A
- Set power supply 1 for 40 V,
measure:
V(J1(VAC)) = 40 V ±
0.5 V
I(J1(IAC)) = 2.4
A ± 0.5 A
V(J3(VBAT)) = 23 V ± 0.5 V I(J3(IBAT)) = 3.9 A ± 0.5
A
- Set power supply 1 for 19 V,
measure:
V(J1(VAC)) = 19 V ±
0.5 V
I(J1(IAC)) = 5.0
A ± 0.5 A
V(J3(VBAT)) = 23 V ± 0.5 V I(J3(IBAT)) = 3.9 A ± 0.5
A
Use the following guidelines to test
the BQ25750 EVM power path:
- Disconnect the power supply from
J1 (VIN and PGND) and disconnect Load 1 from J3 (VOUT and PGND).
- Connect the output of power supply #1 to J3 (VOUT and PGND).
- Set power supply 1 for 20 V DC, 8 A current limit and then turn off power
supply.
- Connect a voltage meter across J2 (VSYS) and J2 (PGND).
- Turn on power supply 1, measure V(J2(VSYS)) = 20 V ± 0.5 V.