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SS6783ACNTB Scheda tecnica(PDF) 7 Page - Silicon Standard Corp. |
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SS6783ACNTB Scheda tecnica(HTML) 7 Page - Silicon Standard Corp. |
7 / 12 page www.SiliconStandard.com 7 of 12 SS6783A(G) 1/11/2005 Rev.2.10 APPLICATION INFORMATION OPERATION Power-On and Battery Pre-Qualifying When power is first applied to the SS6783A, all internal digital circuit blocks of the SS6783A are reset by the internal power-on-reset circuitry and the output LED flashes 3 times to indicate the initiation of power-on. The internal control unit then examines the battery condition through the VBT pin. The acceptable range of VBT pin is 0.16V to 2.7V. If the voltage of VBT pin fails to fall within the predetermined acceptable limits, the SS6783A enters a charge-suspending mode, in which all the internal circuitry remains in reset state. Fast Charge After the battery passes fault checks, fast charging begins while the initial timer and safety timer of the SS6 783A start counting. The functions of −∆V detection, peak voltage timer, and maximum battery voltage are, however, disabled temporarily until the initial timer period in the initial stage of a charge cycle elapses. The initial timer period is equal to 1/80 of the safety timer. Since the low limit of acceptable VBT voltage is only about 0.16V during the initial timer period, even deeply discharged batteries can easily qualify to be subsequently fast charged. In the course of fast charge, the SS6783A constantly monitors the voltages at VBT pin. The fast charge process is switched to trickle charge when any one of the following situations is encountered, which are explained below: Negative delta voltage (−∆V) Peak voltage timer (0 ) V ∆ Maximum charge time Maximum battery voltage - ∆V Cutoff The SS6783A makes a voltage sampling at VBT pin every 4 seconds when 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 VBT 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 determined by the peak voltage timer which is 6% of safety timer, the fast charge action is terminated. Maximum Safety Timer Cutoff The maximum fast charge period is determined by the safety timer, which is set by a resistor connected from TIMER pin to GND. Safety timer, −∆V , sampling rate will be longer if the resistor value is larger. When the value of the resistor is 100k Ω, the safety timer period equals 80 minutes. After the safety timer period is finished, the fast charge action is terminated. Maximum Voltage Cutoff The SS6783A guards against the maximum limits for battery voltage during fast charging. If either of these limits is exceeded, fast charge action is terminated. Trickle Charge T rickle charge starts after the fast charge to prevent the loss of charge due to battery self-discharge. The duty cycle is set to 1/128 by internal circuitry. |
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