www.ti.com
Test Summary
Figure 8. The Waveforms at No Load
2.4.3
Charge Current and AC Current Regulation (DPM)
Change the B0 bit (CHGEND) of Control Register to 0. (Enable the charging). Click Write.
Connect the output of the Kepco load in series with a current meter (multimeter) to J8 (VBAT, GND).
Make sure a voltage meter is connected across J8 (VBAT, GND). Turn on the Kepco load. Connect the
output of the electronic load in series with a current meter (multimeter) to J8 (VSYS, GND). Make sure a
voltage meter is connected across J8 (VSYS, GND). Turn on the power of the electronic load. Set the load
current to 2.5 A
±
50 mA, but disable the output. The setup is now like
for bq24720 and like
for bq24721. Make sure I
(bat)
= 0 A
±
10 mA and I
(sys)
= 0 A
±
10 mA.
12
bq24720/21 EVM (HPA104) for Multi-Cell Synchronous
SLUU237 – January 2006
Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface