Cxlb73137 / cxlb73138 / cxlb73139 is a lead-acid battery charge management chip specially used for AC / DC power supply. It has the functions of constant voltage, constant current and floating charge three-stage state automatic conversion. At the same time, it integrates the dual LED charge indicator conversion circuit and driving circuit, greatly simplifying the number of external components, greatly improving the system stability and reducing the production cost.
Cxlb73137 is internally integrated with 2.5V reference voltage source, 250Mv reference voltage source and 50mV reference voltage source, as well as two operational amplifiers, a current comparator, floating charge control circuit and LED control drive circuit. The 2.5V reference voltage source and an internal operational amplifier form a precise voltage control circuit. The user can adjust the output voltage required by the constant voltage section of lead-acid battery by setting the two external resistances of voltage sampling and the six pin (VF) resistance of the chip; the 250Mv reference voltage source and another internal operational amplifier form a precise current control circuit The user can adjust the output current required by the constant current section of lead-acid battery by setting the external current sampling resistance.