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BQ294602DRVT Datasheet(PDF) 7 Page - Texas Instruments |
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BQ294602DRVT Datasheet(HTML) 7 Page - Texas Instruments |
7 / 21 page VOV V OV V HYS OUT (V) t DELAY – OUT V1 VSS VDD R VD CVD RIN CIN VOV OSC Delay Timer PACK + PACK – INT_EN REG PWRPAD 7 bq294602, bq294604, bq294682, bq294624 www.ti.com SLUSAS0D – DECEMBER 2011 – REVISED APRIL 2017 Product Folder Links: bq294602 bq294604 bq294682 bq294624 Submit Documentation Feedback Copyright © 2011–2017, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The bq2946xx is a second-level overvoltage (OV) protector for a single cell. The cell voltage is compared to a protection voltage threshold, VOV. The protection threshold is preprogrammed at the factory with a range from 3.85 V to 4.65 V. When the OVP is triggered, the OUT pin goes high to activate an external N-channel FET, which conducts a low-impedance path to blow a fuse. 8.2 Functional Block Diagram 8.3 Feature Description The method of overvoltage detection is comparing the cell voltage to an OVP threshold voltage VOV. Once the cell voltage exceeds the programmed fixed value VOV, the delay timer circuit is activated. This delay (tDELAY) is fixed for 4 seconds for the bq294602 device. When these conditions are satisfied, the OUT terminal is transitioned to a high level. This output (OUT) is released to a low condition if the cell input (V1) is below the OVP threshold minus the VHYS. Figure 5. Timing for Overvoltage Sensing 8.3.1 Sense Positive Input for V1 This is an input to sense single battery cell voltage. A series resistor and a capacitor across the cell is required for noise filtering and stable voltage monitoring. |
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