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BQ24314DSJ Datasheet(PDF) 8 Page - Texas Instruments |
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BQ24314DSJ Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 13 page  www.ti.com POWER-ON RESET OPERATION Input Overvoltage Protection Input Overcurrent Protection Battery Overvoltage Protection THERMAL PROTECTION bq24314 bq24316 SLUS763 – JULY 2007 The device resets when the input voltage at the IN pin exceeds the UVLO threshold. All internal counters and other circuit blocks are reset. The device continuously monitors the input voltage, the input current, and the battery voltage. If the input voltage rises above VOVP, the internal FET is turned off, removing power from the circuit. The FAULT pin is driven low. When the input voltage returns below VOVP – VHYS-OVP (but is still above VUVLO), the FET is turned on again after a deglitch time of tON(OVP) to ensure that the input supply has stabilized. The overcurrent threshold is programmed by a resistor RILIM connected from the ILIM pin to VSS. The overcurrent threshold is given by IOCP = KILIM ÷ RILIM. If the load current tries to exceed the IOCP threshold, the device limits the current for a blanking duration of tBLANK(OCP). If the load current returns to less than IOCP before tBLANK(OCP) times out, the device continues to operate. However, if the overcurrent situation persists for tBLANK(OCP), the FET is turned off for a duration of tON(OCP), and the FAULT pin is driven low. The FET is then turned on again after tON(OCP) and the current is monitored all over again. Each time an OCP fault occurs, an internal counter is incremented. If 15 OCP faults occur in one charge cycle, the FET is turned off permanently. The counter is cleared either by removing and re-applying input power, or by disabling and re-enabling the device with the CE pin. The battery overvoltage threshold BVOVP is internally set to 4.35V. If the battery voltage exceeds the BVOVP threshold, the FET is turned off, and the FAULT pin is driven low. The FET is turned back on once the battery voltage drops to BVOVP – VHYS-BOVP. Each time a battery overvoltage fault occurs, an internal counter is incremented. If 15 such faults occur in one charge cycle, the FET is turned off permanently. The counter is cleared either by removing and re-applying input power, or by disabling and re-enabling the device with the CE pin. If the junction temperature of the device exceeds TJ(OFF), the FET is turned off, and the FAULT pin is driven low. The FET is turned back on when the junction temperature falls below TJ(OFF) – TJ(OFF-HYS). 8 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): bq24314 bq24316 |
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