Cxac85196 is a constant voltage and constant current control chip, which is specially used for SMPS power supply and battery charger system with high precision and constant current and constant voltage. The cxac85196 integrates a 1.21v reference voltage source, two integrated operational amplifiers and a current sampling circuit. 1.21v reference voltage source and integrated operational amplifier form a precise voltage control circuit, users can adjust the required output voltage by setting the size of two external resistances; at the same time, the current sampling circuit and another integrated operational amplifier form a precise current control circuit, users can adjust the maximum current limiting electricity by setting the size of an external resistance Current, so that the whole system can be controlled under constant voltage / current to avoid damage to the whole system due to excessive current or high voltage