The JW1551QFNAH#TRPBF is a QFN-20 (4x4) AC-DC controller and regulator, ROHS compliant and manufactured by JoulWatt. It is a switch mode, battery-operated power supply with high efficiency, highly reliable operation and Zero Heat Mode. The device is optimized for low output noise, high power density and low cost. It features adjustable output power, adjustable input current from voltage feedback of peaks/hold, and adjustable power from 0.5W to 15W. It has a wide range of protection functions, such as Undervoltage Lockout, Over Current & Over Temperature Protection, Thermal Shutdown, and Open Loop Protection. In addition, it is highly reliable and immune to electromagnetic interference.