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SS6802AGSTR Fiches technique(PDF) 9 Page - Silicon Standard Corp. |
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SS6802AGSTR Fiches technique(HTML) 9 Page - Silicon Standard Corp. |
9 / 10 page 02/26/2008 Rev.1.00 www.SiliconStandard.com 9 overcurrent threshold current will change accordingly. Suppressing the Ripple and Disturbance from Charger To suppress the ripple and disturbance from charger, connecting C1 to cell 1 and C2 to cell 2 is necessary. Controlling the Charge Control MOSFET R3, R4, R5 and NPN transistor Q1 are used to switch the charge control MOSFET M2. If overcharge does not occur, no current flows out from OC pin and Q1 are turned off, then M2 is turned on. When overcharge occurs, current flows out from OC pin and Q1 is turned on, which turns off M2 in turn. High resistance for R3, R4, and R5 is recommended for reducing loading of the batteries. Latch-Up Protection at CS Pin R6 is used for latch-up protection when charger is connected under overdischarge condition, and also for overstress protection when charger is connected in reverse. The charge detection function after overdischarge is possibly disabled by larger value of R6. Resistance of 1K Ω is recommended. Selection of R1 and R 2 R1 and R2 are used to avoid large current flow through the battery pack under the situation of IC damage or pin short. On the other hand, resistance of R1 and R2 will affect overcharge release voltage and bleeding function. The relationship among Vrelease1,Vrelease2, R1, and R2 is shown as following equations: Vrelease1=VOCR+IUD*R1 Vrelease2=VOCR+IUD*R2 where Vrelease1 is Battery 1, real overcharge release voltage Vrelease2 is Battery 2, real overcharge release voltage Therefore, resistance of R1 and R2 should not higher than 30 Ω. Otherwise, overcharge release voltage would be higher than overcharge protection voltage and the charging current may oscillate. In addition, if overcharge protection function occurs, SS6802 will discharge the overcharged cell and will stop bleeding function even if the voltage is not equal to the other. The recommended resistance of R1 and R2 is from 20 to 30 Ω. Effect of C3 C3 has to be applied to the circuit. Because C3 will keep SS6802 to be charged after overdischarge occurred. In addition, when the differential voltage between charger and battery pack is higher than 2.1V and overcharge protection function work, C3 will avoid battery pack from being charged even if the battery voltage lower than 4V (To avoid battery pack from being charged under charger malfunction situation). The battery pack can be charged again till remove it from charger. SS6802 |
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