AIC1784

AIC1784 Battery Charge 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 T imer, Maxim um T emperature, Maximum Voltage. Linearly Adjustable ∆T / ∆t Detection Slope and Safety Timer. Protection against Battery Voltage and Battery Temperature Faults. Pulsed Trickle Charge Modes. Quick and Easy Testing for Production. 8-pin DIP or SO Packages. DESCRIPTION The AIC1784 fast charge controller IC is designed for intelligent charging of NiMH or NiCd batteries without the risk of overcharg e. −∆V Detection (-0.25%), 0 ∆V detection (peak voltage timer) and ∆T / ∆t detection a re the primary methods employed by the AIC1784 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 me thods h ave been p roved powerful in termin ating fa st cha rging for NiMH and NiCd batteries. The AIC1784 utilizes the combin ation of these two method s to achiev e reliable decision of ending fast charge a nd prevent misacting ca used 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 AIC1784 controller IC to achieve optimal charging. This t...