Quarter Brick 250 W DC/DC Converter achieves 92% efficiency.

Press Release Summary:

Supplied in 2.39 x 1.54 x 0.50 in. package, QMW operates at fixed frequency and follows conservative component derating guidelines. RoHS-compliant unit has 9–36 Vdc input range; isolated, precisely regulated 12 V output; and input to output isolation of 2,250 Vdc. Switching frequency is 275 kHz, output voltage setpoint accuracy is ±1%, and output noise is 120 mV peak to peak. Able to operate from no-load condition up to max 20.5 A output current, converter offers line regulation of 0.2%.

Original Press Release:

High Efficiency 250W Quarter Brick DC DC Converter

Calex Mfg. Co., Inc. of Concord California announces the introduction of the QMW DC/DC converter. The QMW offers a wide 9 to 36VDC input range with an isolated, precisely regulated 12 Volt output. The QMW achieves efficiency of 92% through the use of high efficiency synchronous rectification, advanced electronic circuitry, packaging and thermal design.

The QMW operates at a fixed frequency and follows conservative component derating guidelines. The 92% efficiency rating eases the job of thermal management given the high power density of the compact 2.39” x 1.54” x 0.50”H quarter brick package. This level of efficiency is unprecedented in a 9 to 36VDC input quarter brick.

The input to output isolation of the QMW is 2250VDC. The switching frequency is 275kHz. The output voltage setpoint accuracy is ±1%. Output noise is 120mV peak to peak. The QMW will operate from a no load condition up to the maximum 20.5A output current. Line regulation is 0.2%, same as load regulation. Load transient overshoot is 5% and the load transient recovery time is 500 µs. The QMW features ON/OFF with a low OFF idle current of 20mA, ideal for battery powered applications. The QMW is protected by over voltage protection, input reverse polarity protection, thermal overload protection and short circuit protection. The MTBF for the QMW is 8.6M hours. The unit is also backed by Calex’s Five Year Warranty.

The case operating temperature range of the QMW is -40 to +100C. Storage range is -55 to +125C. The unit weight is 2.4 oz. The QMW is also RoHS compliant. Contact Calex for pricing and delivery.

For more information on the 250 Watt QMW DC/DC go to http://www.calex.com/pdf/qmw.pdf or contact Calex at 800-542-3355/925-687-4411 (phone), 925-687-3333 (fax), sales@calex.com. Calex’s corporate headquarters are located at 2401 Stanwell Drive, Concord, CA 94520 USA.

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