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SS6781ACSTB Datasheet(PDF) 1 Page - Silicon Standard Corp. |
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SS6781ACSTB Datasheet(HTML) 1 Page - Silicon Standard Corp. |
1 / 18 page www.SiliconStandard.com 1 of 18 SS6781A(G) 1/11/2005 Rev.2.10 Battery Charger Controller FEATURES Fast charge control of NiMH/NiCd batteries, even with a fluctuating charging current. Fast charge termination by: ∆T/∆t, -∆V, 0∆V, safety timer, maximum temperature or maximum voltage. Linearly adjustable ∆T/∆t detection slope and safety timer. Adjustable peak voltage timer for 0 ∆V Battery voltage protection range selectable. Selectable battery temperature protection mode Protection against battery voltage and battery temperature faults Selectable LED display mode for battery status. Five pulsed trickle charge modes Discharge-before-charge function available for eliminating memory effect. Quick and easy testing for production Packaged in SO-16 or PDIP-16 APPLICATIONS Fast Battery Chargers for: Mobile Phones. Notebook and Laptop Personal Computers. Portable Power Tools and Toys. Portable Communication Equipment. Portable Video and Stereo Equipment. 0 10 20 30 40 50 60 1.15 1.25 1.35 1.45 1.55 100 80 60 40 20 Temperature Cell Voltage Charge Time (min.) Charge Current = 600 mA Cell Capacity = 550 mA NiMH Battery Fig. 1 Battery Charging Characteristics Resulting from a SS6781A-Controlled Charger with a Fluctuating Charging Current DESCRIPTION The SS6781A fast charger controller IC is designed for intelligent charging of NiMH or NiCd batteries without the risk of overcharge. Using - ∆V detection (-0.25%), 0∆V detection (peak voltage timer) and ∆T/∆t detection are the primary methods employed by the SS6781A to terminate fast charge. The fast charge can also be cut off by maximum battery voltage and maximum battery temperature detection, along with the safety timer to prevent charging under fault conditions of the charging system or the battery itself. Both ∆T/∆t and -∆V detection methods have been proved powerful in terminating fast charging for NiMH and NiCd batteries. The SS6781A utilizes the combination of these two methods to reliably determine when to end fast charge and prevent mistakes caused by using - ∆V detection alone under certain conditions. Fig. 1 shows an example of a charging curve for a battery charged by a fluctuating current from a NiMH battery charger, which uses the SS6781A controller IC to achieve optimal charging. This technique, in conjunction with the 0 ∆V ∆ detection (peak voltage timer), is particularly suitable for NiMH batteries, whose voltage drop is hardly significant yet temperature rises rapidly. The ∆T/∆t T / t or - ∆V detection circuitry may be disabled independently for different applications, such as system-integrated chargers, chargers with varying charge current, or battery packs which lack a temperature sensing thermistor. The safety timer period, battery temperature pro- tection mode, battery voltage protection range, pulsed trickle charge duty, and LED display mode are all adjustable or selectable. This device is available with Pb-free lead finish. |
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