Taking advantage of semiconductor and other technology developed to improve efficiency and functionality, power supply manufacturers continue to address common and unique power source requirements. In some instances new products extend the range of an established family of products. Performance capability can include safe operation from convection cooling without requiring a separate fan or with an integrated fan to ensure adequate cooling. These three products provide examples of the packaging variations that users need to consider.
FAN-COOLED POWER SUPPLIES
By adding a variable-speed, temperature-controlled fan, Lambda’s extended its NV-175 family to handle 200-W peak power. The supplies operate from a 90 to 264V acxinput and are available with one to five outputs, with voltages from 0.9 to 28V and output currents up to 25A, depending on the output configuration. Models with the high output 12V and 24V main channel can deliver up to 200-W peak for one minute to handle the in-rush requirements of motors and pumps. With the integral fan, units measure 1.6 × 3.32 × 6.4 inches and can operate at full power in temperatures ranging from 0 to 50C, derating to 50 percent at 70C. The single and multiple power supplies target applications where system airflow is not available and low audible noise is required, such as medical, light industrial, test equipment and data communications. Get more information on Lambda NV-175 power supplies.
CARDSTYLE POWER SUPPLIES
Kepco’s Series JBW are cardstyle single-output power supplies with ratings of 75, 100 and 150W of dc power. The 5, 12, 15 and 24V output units have a wide input range of 85 to 265V ac and incorporate active Power Factor Correction (PFC). In addition, the supplies carry the CE Mark and all safety agency recognitions, plus they are RoHS-compliant. On-board filtering allows the JBW series to meet FCC Class B conducted emissions compliance.
With overvoltage and overcurrent protection, full output power operation is guaranteed from -10 to 50C with convection cooling alone. Efficiencies range from 75 to 82 percent for units operating from 100 Vac and from 79 to 84 percent for units operating from 240V ac. The JBW supplies will also accept a dc input in the range of 120 to 370V dc. Get more information on Kepco Series JBW power supplies.
HYBRID POWER MODULE
ROHM uses a hybrid package design for both dc-to-dc and ac-to-dc power supplies. The ceramic leadframe with attached pins allows the mounting and interconnecting of ICs, discrete semiconductors, and other components including capacitors and LEDs. For example, with a 5V dc input, the BP5234A-33 provides a 3.3V dc output that handles up to 4A without any additional heat dissipating requirements. With external dimensions of 38.5 × 23.5 ×11 mm, the unit delivers 93 percent conversion efficiency. Custom modules have addressed automotive applications including engine control, anti-lock brakes, fuel control, ac control and power door lock among others. Get more information on ROHM hybrid power supplies.
RUGGED POWER SUPPLY
Phoenix Contact uses a rugged, zinc-plated steel housing for its TRIO power supplies. Measuring between 32 and 115-mm wide, the TRIO occupies less space than most DIN-rail-mounted power supplies and delivers 2.5 to 20A of 24V dc power. The unit’s Mean Time Between Failure (MTBF) rating exceeds 500,000 hours, per IEC 61709, at nominal load and high 40C test standard. Operating in a 0 to 70C temperature range, the unit’s nominal operating temperature is 55C (131F) without de-rating. For more information on Phoenix Contact TRIO Power supplies.
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