Circuit examples of COB components

Relevant key device information applied in this article: MM1491 COB (Chip On Board) component is a circuit form based on the circuit structure of a single lithium-ion battery protection component and all components are encapsulated with resin. It has the following characteristics: ①Small size and light weight. In the package where the integrated protection circuit and the bare-chip FET component are installed, no metal wiring frame is required, and no solder material is required for connecting terminals, thus achieving lightweight components. In addition, since the bare chip is directly mounted on the printed board, the space utilization of the printed board is improved and the size of the printed board is further reduced. ② It has water resistance and insulation. Since all circuit components are sealed with resin, it still has a protective function even if it is immersed in water. In the past, the components that made up the circuit were all exposed, and insulation issues had to be considered when connecting to the battery. However, the resin used in COB is the epoxy resin commonly used in integrated circuit packaging, so there is no insulation problem. ③ Reduces failures during secondary installation. For COB components, it has its own component external port, so there is no need to worry about the falling off or displacement of R, C and other components due to the thermal stress during the secondary installation of the component, thus reducing possible problems that may occur during the secondary installation. Fault. MM1491 is an integrated circuit for single lithium-ion battery protection.