1, based on NCL30001 current adjustable constant current power factor correction area lighting LED power supply
Some area lighting applications require an isolated regulated output voltage with input power factor correction. These applications typically employ a two-stage power conversion architecture in which the boost power factor correction (PFC) converts and pre-regulates the AC input line voltage to 400 V DC and then provides the voltage to a conventional topology that can be any suitable topology. DC-DC converters (typically flyback converters in applications where the power does not exceed 150 W).
An easier way to improve this traditional two-stage conversion architecture is to make it a single-segment architecture with integrated power factor correction and main converter (ie DC-DC converter). This single-stage architecture offers significant application advantages because of the large size of boost inductors, high voltage MOSFETs, power rectifiers, and large capacitors. Of course, this single-segment architecture brings some performance tradeoffs in some respects, but it is an energy-efficient and cost-effective solution for applications with relatively constant loads, such as LED area lighting.
The NCL30001 is a single-stage controller that integrates power factor correction and isolated step-down DC-DC conversion circuitry to help reduce component count, system cost, and support for higher overall LED power efficiency. The NCL30001 provides constant current and constant current to directly drive the LED, eliminating the linear or DC-DC conversion integrated in the LED strip (Figure 1). An ON Semiconductor design note AND8427 describes an LED power supply based on the NCL30001 single-segment continuous current mode (CCM) PFC controller and the NCS1002 secondary-side constant-voltage constant current (CVCC) controller for area lighting applications such as street lights.
Figure 1 The NCL30001-based LED driver solution is suitable for 40 to 125W area lighting applications.
Tests have shown that at 90 to 264 Vac input voltage, the NCL30001-based LED power supply provides greater than 85% energy efficiency, power factor is also higher than 0.9, and provides short-circuit and over-voltage protection. By slightly adjusting the resistance in the secondary side control circuit, the designer can adjust the steady current and the regulated voltage to support the specific application requirements of the end product. It is also worth mentioning that although this power supply is designed to provide a fixed current with tight current regulation, it can also operate in a constant voltage mode because its current and voltage are based on the tightly regulated 2.5 V reference voltage integrated in the NCS1002. To stabilize the flow and voltage regulation.
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