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SLUU110A Datasheet(PDF) 11 Page - Texas Instruments |
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SLUU110A Datasheet(HTML) 11 Page - Texas Instruments |
11 / 21 page Test Procedures 2-3 Test Summary Note: For the two-cell case, at 1-A charge rate, where the battery pack is at 6 V, the power dissipation is temporarily as high as 3.1 W until the pack charges to 6.8 V. This condition is fine for the short time (~1 min.) before the pack reaches 6.8 V. Adjust the input power supply for 9.1 V. The red LED illuminates to indicate charging, unless there is a fault or the battery is fully charged. The bq24004/5/6 enters preconditioning mode if the battery is below the LowV threshold. In this mode, the bq24004/5/6 trickle-charges with approximately 65 mA for approximately 23 minutes. If the battery does not reach the LowV threshold during this period, then the charge current is terminated and the bq24004/5/6 enters fault mode. The red LED flashes in fault mode. This feature may be tested by removing input power, replacing the battery with a 30–40- Ω resistor from BAT+ to DC–, and applying power (Vin) for more than 23 minutes. Fault mode is reset by toggling input power or enable pin. Once the battery charges to the LowV-stop threshold, the battery enters fast- charge mode and charges at the programmed 1-A level. Program charge level may be changed by adjusting R3 R3 + 0.10 V I chg . The battery remains at the fast-charge mode until either the selected time expires or the battery charges to the selected regulation voltage. The time-out feature is tested by using a 25–28- Ω, 5-W resistor in place of the battery. Apply the resistor after the unit is powered. If the battery discharges down to the HighV threshold, the charger starts fast charging. The refresh feature may be tested by charging a battery to completion (Iterm + 23 minutes) and, without disconnecting the battery, installing a 8–10- Ω, 10-W resistor in parallel with the battery. The regulator should start charging once the HIGHV threshold is reached. Note: The battery is still charging for another 23 minutes after the LED turns off. If a load (>Iterm) is applied before the 23 minutes has timed out then the load resets the 23 minute timer. The circuit has an overvoltage comparator for added protection. If the battery voltage exceeds this threshold for 330 ms, then the charger goes into fault mode. This may be tested by connecting an external power supply in place of the battery and adjusting the voltage above the threshold. |
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