8:1 DC-DC Converters

THE IQ64 family of industry-standard half-brick dc-dc converters from SynQor features an 8:1 input-voltage range of 18 to 135 V, which doubles the existing ultra-wide 4:1 input-ratio standard. The converters can satisfy EN50155 requirements for 36-, 48-, and 72-V railway systems.

The converters are constructed with the company's patented two-stage topology with a constant mid-bus voltage to optimize isolation-stage design based on synchronous rectifiers, reducing heat loss and achieving up to 90% efficiency at full load. The fully encased and ruggedized isolated dc-dc converters are offered with nine output voltages, including 1.8, 3.3, 5, 12, 15, 24, 28, 40, and 48 V. For each output voltage there are two converters: one rated in the 200-W range, and a second unit in the 150-W range for lower-power requirements.

The dc-dc converters provide on/off control referenced to input side, remote sense for the output voltage, and an output-voltage trim range of ?20%, +10%. Protection features include input undervoltage lockout, input overvoltage shutdown, output current limit and short-circuit protection, active back bias limit, output overvoltage protection, and thermal shutdown. All models have at least a 2,250-Vdc isolation rating between input and output, have calculated MTBF values in excess of 2 MHrs, and are fully RoHS compliant.

The IQ64 series is available immediately from stock for evaluation and qualification. Production quantities are available with 8- to 12-week lead-times, depending upon volumes.
SynQor
Boxborough, MA
http://www.synqor.com