The MP4012 is a current mode controller designed for driving the high brightness Light Emitting Diodes (LEDs) from extremely wide input voltage 8V-55V. It can be used in Boost, Buck, Buck-boost and SEPIC topologies.  The MP4012 drives external MOSFET with fixed frequency/constant off-time architecture to regulate the LED current, which is measured through an external current sense resistor. Its feedback voltage can be adjusted by the external DC bias voltage. The MP4012 can work in constant frequency operation mode or constant off