AIC1784

Pinout




Description

The AIC1784 fast charge controller IC is designed for intelligent charging of NiMH or NiCd batteries without the risk of overcharge.   Detection (-0.25%),   detection (peak voltage timer) and   detection are 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   and   detection methods have been proved powerful in terminating fast charging for NiMH and NiCd batteries. The AIC1784 utilizes the combination of these two methods to achieve reliable decision of ending fast charge and prevent misacting caused by using   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 technique, in cooperating with the   detection (peak voltage timer), is particularly suitable for NiMH batteries, whose voltage drop is hardly significant yet temperature rises rapidly.
The safety timer period is adjustable. Test mode of AIC1784 is provided for charger manufactures to dramatically reduce production test time.