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SS6802 Datasheet(PDF) 7 Page - Silicon Standard Corp. |
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SS6802 Datasheet(HTML) 7 Page - Silicon Standard Corp. |
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7 / 10 page  02/26/2008 Rev.1.00 www.SiliconStandard.com 7 APPLICATION INFORMATION THE OPERATION Overcharge Protection When the voltage of either of the battery cells exceeds VOCP (overcharge protection voltage) beyond the overcharge delay time period, charging is inhibited by the turning-off of the charge control MOSFET M2. The overcharge delay time (TOC) defaults to 25mS and can be extended by adding a capacitor CTC. Inhibition of charging is immediately released when the voltage of the overcharged cell becomes lower than VOCR (overcharge release voltage) through discharge. Overdischarge Protection When the voltage of either of the battery cells goes below VODP (overdischarge protection voltage) beyond the overdischarge delay time period, discharging is inhibited by the turning-off of the discharge control MOSFET M1. The overdischarge delay time (TOD) defaults to 25mS and can be extended by adding a capacitor CTD. Inhibition of discharging is immediately released when the voltage of the overdischarged cell becomes higher than VODR (overdischarge release voltage) through charging. Power-Down after Overdischarge When overdischarge occurs, the SS6802 will go into power-down mode, turning off all the timing generation and detection circuitry to reduce the quiescent current to 0.8 µA (VCC=4.8V). In the unusual case where one battery cell is overdischarged while the other under overcharge condition, the SS6802 will turn off all the detection circuits except the overcharge detection circuit for the cell under overcharge condition. Charge Detection after Overdischarge When overcharge occurs, the discharge control MOSFET M1 turns off and discharging is inhibited. However, charging is still permitted through the parasitic diode of M1. Once the charger is connected to the battery pack, the SS6802 immediately turns on all the timing generation and detection circuitry and goes into normal mode. Charging is determined to be in progress if the voltage between CS and GND is below –0.4V (charge detection threshold voltage VCH) Overcurrent Protection In normal mode, the SS6802 continuously monitors the discharge current by sensing the voltage of CS pin. If the voltage of CS pin exceeds VOIP (overcurrent protection voltage) beyond overcurrent delay time TOI period, the overcurrent protection circuit operates and discharging is inhibited by turning-off of the discharge control MOSFET M1. Discharging must be inhibited for at least 256mS after overcurrent takes place to avoid damage to external control MOSFETs due to rapidly switching transient between VBAT+ and VBAT- terminals. The overcurrent condition returns to the normal mode when the load is released and the impedance between the VBAT+ and VBAT- terminals is 10M Ω or higher. For the sake of protection of the external MOSFETs, the larger the CS pin voltage (which means the larger discharge current) the shorter the overcurrent delay time. The relationship between voltage of SS6802 |
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