Texas Instruments BQ25886, Руководство пользователя

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Test Summary
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6 SLUUC11 – February 2019
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BQ25886 QFN Standalone boost-mode battery charger evaluation module
Advance Information
1. Turn on PS#1 and click the Read Register button twice.
• Observe → everything "Normal" at the Fault box
• Observe → D4 (STAT) is off because charge is disabled.
• Observe → D5 (PG) is on indicating power is good.
• Measure on VM2 → V(TP14 (SYS), TP26 (AGND)) = 6.4 V ±50 mV
2. On BQ25886EVM, remove shunt on JP15 to start charge. To correct for cable resistance, adjust PS#1
until VM1 [TP7 (VBUS_S), TP26 (AGND)] measures 5.5 V ±50 mV and adjust BS#1 until VM3 [TP15
(BAT), TP26 (AGND)] measures 7.6 V ±50 mV.
• Measure on VM6 → V(TP5 (RBAT+), TP6 (RBAT-)) = 10 mV ±0.7 mV which corresponds to ICHG
= 1.0 A ±5% through a 0.010-
Ω
±1% resistor. Voltage of 0.1 mV is added to account for DMM
accuracy.
• Measure on VM4 → V(TP1 (RAC+), TP2 (RAC-)) = 14.8 mV ±0.7 mV which corresponds to IVBUS
= 1.48 A ±5% (accounting for efficiency variation across ICs and inductors) through a 0.010-
Ω
±1%
resistor. Voltage of 0.1 mV is added to account for DMM accuracy.
3. Optionally, . Adjust the RLIM potentiometer (R5) until:
• Measure on VM4 → V(TP1 (RAC+), TP2 (RAC-)) = 10 mV ±0.7 mV which corresponds to IVBUS =
1.0 A ±5% through a 0.010- Ω ±1% resistor. Voltage of 0.1 mV is added to account for DMM
accuracy.
4. Turn off and disconnect PS#1, BS#1, Load#1, and voltmeters.