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SS6782GNTR Datasheet(PDF) 10 Page - Silicon Standard Corp. |
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SS6782GNTR Datasheet(HTML) 10 Page - Silicon Standard Corp. |
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10 / 19 page  www.SiliconStandard.com 10 of 19 SS6782G 9/21/2005 Rev.3.01 ac tion to be taken is determined by the input volt age of SEL3 pin. Discharge-Before-Charge The SS6782G provides the function of discharge- before-charge to precondition NiCd batteries, which can suffer from a memory effect. This function can only be activated for pack B after the prequalification of battery voltage and tem- perature, but before the charge completion is registered for a fast charge cycle of pack B. To trigger this function, DSW pin has to be bi- ased to GND over 0.18 second. After discharge begins, LEB1 and LEB2 pins are both OFF, ICOB pin is ON, and DIS pin goes high to acti- vate an external circuit to discharge the battery pack B until the voltage of BBV pin fall below 0.9V (or 0.69V, depending on the input voltage of SEL3 pin) or DSW pin is biased to GND for over 0.18 second again. The application circuit is included in the TYPICAL APPLICATION CIRCUIT shown on page 2. Fast Charge After the battery passes fault checks, charging begins on either of the batteries, and the other bat tery remains in a waiting state until the first bat tery terminates fast charging. The SS6782G automatically switches to fast charge the second battery. The battery pack A has the priority over battery pack B only when power is first applied to the SS6782G. When fast charging begins, the initial and safety timer of the SS6782G start counting. The - ∆V detection, peak voltage timer, ∆ detection, and maximum battery voltage functions are, however, disabled temporarily until the initial timer period in the initial stage of the charging cycle elapses. The initial timer period is equal to 1/80 of safety timer. ∆ T/ t Since the low limit of acceptable ABV or BBV voltages are only about 0.16V during the initial timer period, even deeply discharged batteries can easily qualify to be fast charged subse- quently. In the course of fast charge, the SS6782G con- stantly monitors the battery voltage and tem- perature through ABV (or BBV) and ATS (or BTS) pins. The fast charge process is regis- tered complete when any one of the following situations is encountered, which are explained below: Negative delta voltage (- ∆V). Peak voltage timer (0 ). V ∆ Delta temperature/ delta time (∆ ∆ T / t ). Maximum charge time. Maximum battery voltage. Maximum battery temperature. - ∆V Cutoff The SS6 782G makes a voltage sampling at ABV (or BBV) pin every 4 seconds when the safety timer period is set equal to 80 minutes. If a negative delta voltage of 0.25% compared to its peak value is detected at ABV (or BBV) pin, the fast charge cycle is terminated. 0 ∆V Cutoff If the battery voltage stays at its peak value or decreases very slowly for the duration deter- mined by the peak voltage timer, which is in turn equal to 3.7% of the safety timer, the fast charging action is terminated. ∆T/∆t Cutoff The ∆ ∆ T / t detection of the SS6782G is per- formed by sensing the decrease of ATS (or BTS) pin voltage in a specific timer interval dic- tated by the safety timer. The fast charging terminates when the decrease of ATS (or BTS) pin voltage in 56 seconds exceeds the prede- termined value set by ADJ pin input. This time interval of 56 seconds is based on the assump- tion that the voltage of ATS (or BTS) pin is sampled |
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