Emerson Network Power has announced the high efficiency power supplies for LED lighting, the LDS25 series. The 25W LED power supplies have an input range of 120 to 277V AC and can deliver up to 700mA at 36V DC. Constant current and constant voltage output modes accommodate different LED application requirements. Constant current mode operates from 36 to 26V, while constant voltage mode operates with load currents from 300 to 700mA or to the programmed current limit level - which can be set by a single resistor to any value within this range.
Alternatively, the output current can be adjusted over its full 0 to 700mA range by an IEC 60929 compliant dimming function, controlled by a standard 0 to 10V signal, claims the company. Active power factor correction enables the company's power supplies to achieve a power factor of at least 0.9 and they have a conversion efficiency of 86%. They are rated for operation over an ambient temperature range of -30 to +60°C or a case temperature range of -30 to +90°C, with no need for forced air cooling, claims the company. The power supplies are suitable for indoor applications, the LED lighting power supplies are available in open-frame and IP20 rated cased versions. The open frame model has a footprint of 147x42mm and a height of 28 mm, while the IP20 cased model is 174.5x45.6mm and is 32mm high.
The power supplies comply with the CISPR 15 requirement for EMI and meet FCC part 15 conducted noise standards. They are protected against short-circuit, over-voltage and over-temperature conditions. The power supplies feature hot-wiring protection, which automatically limits the rate of increase of output current to prevent damage to the LED and driver circuits, says the company. Critical safety specifications include EN 61347-2-13 and UL 8750, which are specific to LED related applications, and the power supplies also complies with CSA C22.2 No. 107.1 and CE LVD directives.
