Microsemi Unveiled the LXMG221D-0700040-D2F LED Driver

Published:2011/11/2 21:51:00 Author:Phyllis From:SeekIC

LXMG221D-0700040-D2F is a LED driver designed specially for North American street light installations. It is a fully enclosed compact solid-state LED lighting driver module operates from a universal AC input supply in the range of 347VAC to 480VAC, 60Hz to drive a string of LEDs with active power factor correction. LED string voltage can range from 40V to 57V at a constant current of 700mA.

The control terminal leads of LXMG221D-0700040-D2F include a dimming input BRITE A with a dedicated RETURN lead. The amplitude of the output LED string current will vary from 10% to 100% corresponding to a 1VDC to 10VDC signal on the BRITE A input following the 0V to 10V ESTA E1.3-2001 Analog Control Specification Standard.

In the case that there is an LED string short between OUTPUT (+) and OUTPUT (-), or string open, or a product over temperature condition the FAULT terminal will go low. The FAULT terminal includes an open collector device that can be pulled up to a maximum of 60V and will sink 8mA typical to 0.8V when a short or open fault occurs.

To reduce audible noise the internal switching frequency remains above 30 kHz. Safety features include open output circuit protection, whole string short circuit protection. The maximum allowable hot spot case temperature is 90°C (above this temperature the module will be thermally self-protected). The recommended operating ambient temperature range is -30°C to 70°C, as long as the maximum case temperature is not exceeded.

In Canada and in the United States, power is often distributed to an outdoor lighting fixture at 347V or 480V. The fixture must then convert the power to much lower voltages (often less than 60V in the United States) to properly drive the LED. Until now, this conversion was accomplished using bulky and inefficient step-down transformers. Microsemi’s LXMG221D-0700040-D2F eliminates the need for these transformers, accomplishing the voltage conversion in one step. In addition, since multiple power supplies can be used in a modular fashion, many models of street lights are supported.

Undetected and unreported non-functioning fixtures are a key issue for municipalities responsible for the illumination of public areas. Microsemi’s new LED driver includes fault detection and management capabilities, which can allow operators to address this issue and respond more quickly to light fixture failure.

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