Texas Instruments bq24720 EVM, User Manual, Page: 16 / 34

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Test Summary
Figure 13. The Software Main Window
Turn off the electronic load.
Measure
→
I
(sys)
= 0
±
100 mA, I
(bat)
= 3000 mA
±
200 mA.
2.4.4 Charger Cut-Off by Thermistor (bq24721 ONLY)
Slowly increase the output voltage of PS3 until I
(bat)
= 0 A
±
10 mA.
Measure
→
V(J8(ACGD)) = 3.675 V
±
300 mV
Slowly decrease the output voltage of PS3. Charge resumes. Continue to decrease the output voltage of
PS3 until I
(bat)
= 0 A
±
10 mA.
Measure
→
V(J8(ACGD)) = 1.465 V
±
300 mV
Slowly increase the output voltage of PS3 to 2.5 V
±
100 mV
Measure
→
I
(bat)
= 3000 mA
→
200 mA.
2.4.5 Voltage Regulation and NonSynchronous Operation at Light Load
Slowly increase the output voltage of the Kepco load until I
(bat)
= 300 mA
±
20 mA
Measure
→
V(J8(VBAT, GND)) = 12.6 V
±
200 mV
In the Software main window, click Read All.
Observe
→
The B2 bit (NoVreg) of the Status Register turns green (voltage loop active). The window
should be like Figure 14 .
16 bq24720/21 EVM (HPA104) for Multi-Cell Synchronous SLUU237 – January 2006
Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface