Wide input range medium voltage DC-DC power supply solution for LED applications-EEWORLD

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In addition to portable power applications, there is a range of high-brightness LED applications that work in the 8 to 40VDC range of power sources, including lead-acid batteries, 12-36VDC adapters, solar cells, and low-voltage 12 and 24VAC AC systems. This type of lighting application is numerous, such as event lighting, landscape and road lighting, automotive and traffic lighting, solar-powered lighting, and display cabinet lighting.

Even if the goal is to drive LEDs with constant current, the first thing to understand is the input and output voltage variations of the application. The forward voltage of the LED is determined by material properties, junction temperature range, drive current, and manufacturing tolerances. With this information, the appropriate linear or switching power supply topology can be selected, such as linear, buck, boost, or buck-boost.

For LED applications with input voltage less than 40V, if the output voltage is less than the input voltage, a buck topology is selected. On this basis, the output current is selected. If the output current is greater than 1.2A, the 1.5A constant current switching regulator NCP3065 designed to power high-brightness LEDs can be used. This device has a very low feedback voltage rating of 235mV, which is suitable for regulating the average current of the LED string. It has a wide input voltage range of up to 40V, allowing it to operate from a 12Vac or 12Vdc power supply. The NCP3065 also provides a version suitable for automotive applications - the NCV3065. With only a few external components (such as MOSFETs or low VCEsat switches), the NCP3065 switching regulator can be configured as a buck, boost or SEPIC topology. This allows it to be used in applications with currents less than 1.2A. For applications with currents less than 1.2A, the NCP1215 MOSFET can also be used to form a buck converter. For applications where the current is less than 500mA and the input voltage is close to the output voltage, a constant current linear driver such as the NUD4001 can be used.

Keywords：LED Reference address：Wide input range medium voltage DC-DC power supply solution for LED applications

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