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SS6802 Datasheet(PDF) 8 Page - Silicon Standard Corp. |
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SS6802 Datasheet(HTML) 8 Page - Silicon Standard Corp. |
8 / 10 page 02/26/2008 Rev.1.00 www.SiliconStandard.com 8 CS pin and overcurrent delay time TOI is tabulated as below. VCS (V) TOI (S) 150m 9.0m 200m 5.6m 300m 2.8m 360m 2.0m 1V 540 µ 3V 290 µ 5V 270 µ Unbalanced Discharge after Overcharge When either of the battery cells is overcharged, the SS6802 will automatically discharge the overcharged cell at about 7.7mA until the voltage of the overcharged cell is equal to the voltage of the other cell. If the voltage of the other cell is below VOCR, the internal cell-balance “bleeding” will proceed until the voltage of the overcharged cell decreases to VOCR. DESIGN GUIDE Adjustment of Overcharge and Overdischarge Delay Time Both the overcharge and overdischarge delay times default to 25mS and can be extended by adding the external capacitors CTC and CTD, respectively. Increasing the capacitance value will increase the delay time. The relationship between capacitance of the external capacitors and delay time is tabulated as below: CTC (F) TOC (S) 0 µ 25m 0.1 µ 320m 0.3 µ 890m 0.47 µ 1.12 0.57 µ 1.43 CTD (F) TOD (S) 0 µ 25m 0.1 µ 320m 0.3 µ 820m 0.47 µ 1.08 0.57 µ 1.39 Selection of External Control MOSFETs Because the overcurrent protection voltage is preset, the threshold current for overcurrent detection is determined by the turn-on resistance of the discharge control MOSFET M1. The turn-on resistance of the external control MOSFETs can be determined by the equation: RON=VOIP/IT (IT is the overcurrent threshold current). For example, if the overcurrent threshold current IT is designed to be 5A, the turn-on resistance of the external control MOSFETs must be 30m Ω. Users should be aware that turn-on resistance of the MOSFET changes with temperature variation due to heat dissipation. It changes with the voltage between gate and source as well. (Turn-on resistance of a MOSFET increases as the voltage between gate and source decreases). Once the turn-on resistance of the external MOSFET changes, the SS6802 |
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