1.Before upgrading, we use Taiwan protection ic .
2.After upgrading, we use Samsung‘s ITM protection IC to increase over-current protection



1.Before upgarading,The pins are short, which can lead to poor welding and empty welding
2.After upgrading, lengthen protect ic patch, weld more firmly, avoid empty welding



1. Before upgrading, Partial components are fixed with insulated electronic glue
2. After upgrading, All components are fixed with insulated electronic glue, Prevent short circuit, electrostatic breakdown, and can effectively prevent the falling of components caused by transportation


1. Use the capacitance and resistance of 0402 specifications
2. Use the capacitance and resistance of 0201 specifications， Add the circuit design space, widen the PCB main line , strengthen the conductivity , decrease the internal resistance.