K Series (DC)

APPLICATION

The Melcher K series dc dc converters represents a broad and flexible range of power supplies for use in advanced electronic systems. Features include high efficiency, high reliability, low output voltage noise and excellent dynamic response to load/line changes. LK models can be powered by dc or ac with a wide-input frequency range (without PFC).

The converter inputs are protected against surges and transients. An input over- and under voltage lockout circuitry disables the outputs if the input voltage is outside of the specified range. Certain types include an inrush current limiter preventing circuit breakers and fuses from tripping at switch-on.

All outputs are open- and short-circuit proof and are protected against over voltages by means of built-in suppressor diodes. The outputs can be inhibited by a logic signal applied to pin 18

If the inhibit function is not used, pin 18 must be connected with pin 14 to enable the outputs.
LED indicators display the status of the converter and allow for visual monitoring of the system at any time.

Full input-to-output, input-to-case, output-to-case and output-to output isolation is provided. The converters are designed and built according to the international safety standards IEC/EN60950 and EN50155. They have been approved by the safety agencies TÌÏV and UL (for USA and Canada).

The case design allows operation at nominal load up to 71 ¡C in a free-air ambient temperature. If forced cooling is provided, the ambient temperature may exceed 71 ¡C, but the case temperature must remain below 95 ¡C under all conditions.

A temperature sensor generates an inhibit signal, which disables the outputs if the case temperature Tc exceeds the limit. The outputs are automatically re-enabled when the temperature drops below the limit.

Various options are available to adapt the converters to individual applications.

The converters may either be plugged into a 19″ rack system according to IEC 60297-3, or be chassis mounted. They are ideally suited for Railway applications.