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AIC1781 Datasheet(PDF) 1 Page - Analog Intergrations Corporation |
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AIC1781 Datasheet(HTML) 1 Page - Analog Intergrations Corporation |
1 / 17 page AIC1781 Battery Charge Controller Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC www.analog.com.tw DS-1781-00 TEL: 886-3-5772500 FAX: 886-3-5772510 1 FEATURES Fast Charge Control of NiMH/NiCd Batteries, even with a Fluctuating Charging Current. Fast Charge Termination by: ∆∆ T / t , −∆V, 0V ∆ , Safety Timer, Maximum Temperature, Maximum Voltage. Linearly Adjustable ∆∆ T / t Detection Slope and Safety Timer. Adjustable Peak Voltage Timer for 0V ∆ . 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. 16-pin DIP or SO Packages. APPLICATIONS Battery Fast Chargers for: Mobile Phones. Notebook and Laptop Personal Computers. Portable Power Tools and Toys. Portable Communication Equipments. Portable Video & Stereo Equipments. 0 10 2030405060 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 an AIC1781-Controlled Charger with a Fluctuating Charging Current DESCRIPTION The AIC1781 fast charge controller IC is designed for intelligent charging of NiMH or NiCd batteries without the risk of overcharge. −∆V detection (-0.25%), 0V ∆ detection (peak voltage timer) and ∆∆ T / t detection are the primary methods employed by the AIC1781 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 AIC1781 utilizes the combination of these two methods to achieve reliable decision of ending fast charge and prevent misaction caused by using −∆V detection alone under certain conditions. Fig. 1 shows an example of charging curve of a battery charged by a fluctuating current from a NiMH battery charger which uses the AIC1781 controller IC to achieve optimal charging. This technique, in cooperating with the 0V ∆ detection (peak voltage timer), is particularly suitable for NiMH batteries, whose voltage drop is hardly significant yet temperature rises rapidly. The ∆∆ 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 lack of temperature sensing thermistor. The safety timer period, mode of battery temperature protection, battery voltage protection range, pulsed trickle charge duty, and LED display mode are all adjustable or selectable. Discharge- before-charge function is included to get rid of memory effect of NiCd batteries without the risk of overdischarging. Test mode is provided for charger manufactures to dramatically reduce production test time. |
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