Monolithic Power Systems has introduced two new LED driver ICs: the MP4000 for non-isolated lighting applications and the MP4020 for isolated applications.
The MP4000 is a high-efficiency step-down converter designed for driving high-brightness light emitting diodes (HBLEDs). It drives an external MOSFET in the floating buck converter structure. The inductor current is regulated with boundary conduction mode which features no reverse recovery loss in the freewheeling diode and soft turn-on for the power MOSFET. This operation mode can achieve very high efficiency and at the same time minimise the inductor value and size.
The LED current can be well regulated by controlling the MOSFET peak current, which is sensed through an external resistor. The low 300 mV feedback voltage reduces power loss and improves efficiency.
The MP4020 is a primary side controlled offline LED lighting controller which can achieve high power factor and accurate LED current for an isolated lighting application in a single-stage converter. The proprietary real current control method can control the LED current accurately from the primary side information. It can simplify the LED lighting system design and increase efficiency by removing the secondary feedback components and the current sense resistor.
The MP4020 integrates power factor correction and operates in boundary conduction mode for reduced power loss. Its low startup current and quiescent current can reduce the power consumption for enhanced efficiency.
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