Texas Instruments bq24260, Руководство пользователя

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Test Summary
9. VM #4 is optional.
10. Turn on PS #1 and PS #2, if used.
11. Software setup:
• Press the READ button to obtain the current settings.
• Set Write On Change to ON, if not already set.
• Set Reset Watchdog Timer to reset every 5 seconds.
• Uncheck Disable Charging , if checked.
• Check Enable STAT/INT Outputs .
• Set Battery Regulation Voltage to 4.20 V.
• Set Input Current Limit to 2.5 A.
• Set Charge Current to 2000 mA.
• Click the READ button at the top of the window and confirm that the previous settings remain.
12. Test the charge current regulation by adjusting the PS #1 power supply so that VM #1 still reads 5 V
and PS #2 so that the voltage measured by VM #2 is 3.6 V.
Measure on CM #2
→
I
CHRG
= 2000 mA ±100 mA.
Measure on CM #1 → I
IN
< 1600 mA.
13. Test the input current limit by lowering the software's Input Current Limit setting to 900 mA then
readjusting PS #1 so that VM #1 reads 5 V and PS #2 reads 3.6 V.
Measure on CM #2 → I
CHRG
< 2000 mA.
Measure on CM #1 → I
IN
= 800 mA – 900 mA.
14. Test the minimum system voltage and DPPM by returning the software's Input Current Limit setting
to 2500 mA then lowering PS #2 until VM #2 reads 3.3 V. Add an external resistive or constant current
load across J13 and J5 that does not draw more than 2.5 A from SYS.
Measure on VM #3 → 3.44 V – 3.55 V.
Measure on CM #2 → I
CHRG
= 2000 mA ±100 mA minus the load current on SYS.
15. Test the V
INDPM
function by removing the load on SYS, adjusting PS #1 so that VM #1 reads 5 V,
adjusting PS# 2 so that VM #2 reads 3.6 V and then lowering the current limit setting on PS #1 to
below the software's
Charge Current setting.
Measure on VM #1 → V
IN
= software's V
INDPM
level (default of 4.2 V).
Measure on CM #2 → I
CHRG
< 2000 mA.
16. Test battery regulation and charge termination by returning the PS #1 current limit to 4-A and
confirming that the software's Enable Termination box is checked, then, slowly increase PS #2 until
VM #2 reaches 4.2 V.
Measure on CM #2 → I
CHRG
slowly tapers to the software's I
TERM
setting (default of 150 mA) and then
drops to zero.
Observe → LEDs turn off.
17. Test battery supplement mode by lowering PS #2 until VM #2 reads 3.6 V. Add an external resistive or
constant current load across J13 and J5 that draws more than 3 A from SYS.
Measure on VM #4
→
3.6 V – I
BATSUP
× R
DS(ON)(BATFET)
.
Measure on #2 → I
CHRG
= –I
BATSUP
.
18. Turn off PS #1 and PS #2.
11 SLUUAV8A – February 2014 – Revised August 2014 User's Guide for QFN Packaged bq24260, bq24261, and bq24262 3-A
Battery Charger Evaluation Module
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