Texas Instruments bq24650, User Manual, Page: 7 / 19

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Test Summary
2.7 Procedure
2.7.1 Power Supply and VREF
Ensure that Section 2.6 steps are followed.
Disconnect LOAD#1#2. Turn on PS#1.
Measure → V(J2(VSYS)) = 21 V ±500 mV
Measure → V(J2(VOUT)) = 0 V ±500 mV
Measure → V(TP(VREF)) = 3.3 V ±200 mV
Measure → V(TP(REGN)) = 0 V ±200 mV
2.7.2 Charger Enable and Battery Detection
Connect 2-3 of JP1 (Internal TS); Short JP4 (Charger Enable)
Measure → V(TP(VREF)) = 3.3 V ±200 mV
Measure → V(TP(REGN)) = 6 V ±200 mV
Observe → V(J2(VOUT))=12.6 V ±500 mV
Observe → D4 (/STAT1) OFF, D5 (/STAT2) OFF
2.7.3 Charge Current/Voltage Regulation and Battery Temperature Qualification
Reconnect LOAD#2, and turn on. Use the constant voltage mode. Set the output voltage to 8 V.
Measure → I(J2(VOUT)) = 0.2 A ±100 mA
Observe → D4 (/STAT1) ON, D5 (/STAT2) OFF
Increase the voltage of LOAD#2 to be 10.5 V.
Measure
→
I(J2(VOUT)) = 2 A ±200 mA
Observe
→
D4 (/STAT1) ON, D5 (/STAT2) OFF
Open 2-3 of JP1
Measure → I(J2(VOUT)) = 0 A ±100 mA
Observe → D4 (/STAT1) OFF, D5 (/STAT2) OFF
Connect 2-3 of JP1 (Internal TS)
Measure
→
I(J2(VOUT)) = 2 A ±200 mA
Observe
→
D4 (/STAT1) ON, D5 (/STAT2) OFF
2.7.4 Charger Termination
Increase the voltage of LOAD#2 slowly to approximately 12.6 V.
Observe → I(J2(VOUT)) decreases from 2 A while V(J2(VOUT)) becomes constant.
Observe → I(J2(VOUT)) drops to zero when it is less than 0.2 A.
2.7.5 Maximum Power Point, Input Voltage Regulation
Connect the output of the Load#1 in series with a current meter (multimeter) to J2 (SYS, PGND). Ensure
that a voltage meter is connected across J2 (SYS, PGND). Resume other status as in
Section 2.7.3 .
(Short JP1, JP4, set LOAD#2 to 10.5 V.)
7 SLUU444A – August 2010 – Revised October 2010 bq24650EVM Synchronous, Switch-Mode, Battery Charge Controller for Solar
Power
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