The APL5610/A integrates various functions. For example, a Power-On-Reset (POR) circuit monitors VCC supply voltage to prevent wrong operations; the function of Under-Voltage Protection (UVP) protects the device from short circuit condition. A POK indicates that the output status with time delay which is set internally. It can control other converter for power sequence. Moreover, the APL5610/A can be enabled by other power system; namely, holding