Grouped in seven product families, the VP series of dc/dc converters offers 35 models with power ratings from 6 to 45W in single-, dual-, and triple-output configurations. Units are available with 3.3, 5, ±5, 12, ±12, 15, and ±15V outputs. Inputs vary with each model but include standard 18 to 36V and 36 to 72V ranges. Some models feature an extended input range of 18 to 72V. VP series pricing starts at $90. Interpoint Corp, Redmond, WA. (206) 882-3100.
When a high-voltage source is required for devices such as photomultiplier tubes, radiation detectors, or ink-jet printers, the R3 series of dc/dc converters lets you select any output voltage range from 0 to 500 to 0 to ±2000V dc. The 3W converters accept input voltages from 5 to 28V dc with a range of ±10%. The load regulation is 0.01%, and the line regulation is 0.005%, with a voltage accuracy of 0.5%. The output ripple is <0.001%. All models are encapsulated in a six-sided copper case that is 3×2.5×0.83-in. Converters cost $170 (100). Orion Industries Inc, Windham, NH. (603) 894-4242.
Designed primarily for battery-powered systems, OR5 dc/dc converter modules furnish a fully regulated output over a 5-to-1 input-voltage range that extends both above and below the output voltage. The 1W converters come in versions with a fixed-voltage output of 3.3, 5, 6, 9, or 12V and accept an input in the range of 3 to 15V. Switching frequency is typically 70 kHz, and a PWM topology ensures fixed-frequency operation with no subharmonics. Housed in a single in-line module, the OR5 costs $36 (100). The Saelig Co, Victor, NY. (716) 425-3753.
Housed in a six-sided EMI/RFI-shielded package that is 1×2×0.375-in., the LW10 dc/dc converter delivers 10W and operates at a typical efficiency of 84%. The LW10 offers a 2:1 input range of 9 to 18V dc, 18 to 36V dc, or 36 to 72V dc. Line-and-load regulations for both are ±1%. Ripple and noise are rated at 200 mV rms. The LW10 converter costs $18 in OEM quantities. Polytron Devices Inc, Paterson, NJ. (201) 345-5885.
An open-frame-switching power supply, the Model M500, lets you mix and match up to seven fixed or adjustable auxiliary outputs. The 500W supply provides a main output of 5V dc at 55A. Up to three auxiliary modules provide adjustable outputs of 4.5 to 8.5V at 10A, 10.5 to 17V at 10A, and 20 to 28V at 5A. The M500 also lets you select any two fixed-voltage modules: 5, 12, 15, or 24V at 1A. A universal input allows continuous operation between 90 and 264V ac. At full load, the M500 is rated for operation from 0 to 50°C, with a temperature coefficient of 2%/°C from 50 to 70°C. The supply costs $0.85/W (OEM). Xentek Inc, San Marcos, CA. (619) 471-4001.
Configured with single or multiple outputs, the LP 250 series of 250W power supplies offers not only power-factor correction, but also IEC 555-2 compliance, remote sense, remote inhibit, and overvoltage protection. Units are enclosed in U-channel housing that measures 5×9×2-in. Single-output supplies cost $224.50; quad versions cost $246.23 (100). Astec America Inc, Carlsbad, CA. (619) 757-1880.
Global Power line conditioners automatically accept input voltages from 80 to 300V ac and frequencies of 40 to 70 Hz and supply a regulated output of 120 or 220V ac and a switch-selectable between 50 and 60 Hz. Units are available with power ratings of 1500 and 3000 VA and provide ±2% output-voltage regulation. The 19-in., rack-mount conditioners cost $995. Perfect Power Inc, Danbury, CT. (203) 748-7001.
The GC series of 20W dc/dc converters provides single and dual outputs of 5, 12, or 15V dc. The units are housed in a 2×1.6×0.40-in. metal case, making them useful for applications where space is critical. Input voltages range from 18 to 36V dc and 36 to 72V dc. Typical efficiency is 85%. The GC converters cost about $30 (OEM). Semiconductor Circuits Inc, Windham, NH. (603) 893-2330.
The low-profile RM series of dc/dc converters operates at efficiencies of 90% at 5V and 100W, without a heat sink. Standing 8 mm tall, the converters achieve a power density of up to 29W/in.3. Built-in in-rush limiting and EMI filters are standard. Offered in 30, 50, and 100W versions, the RM series is priced from $105 (100). Lambda Electronics Inc, Melville, NY. (516) 694-4200.
Consisting of 15 models, the 500WFR series of dc/dc converters comes in a low-profile 1.25×0.80×0.4-in. case that is compatible with a 24-pin DIP. The miniature size of the module yields a power density of 12.5W/in.3. Converters operate over a 2-to-1 input-voltage range of 9 to 18, 18 to 36, or 36 to 72V dc and provide regulated outputs of 5, 12, 15, ±12, or ±15V dc. Output-voltage accuracy is within ±1%. Each model in the 500WFR series operates over a temperature range of -25 to +75°C with no derating or heat sinking required. Prices start at $36.80 (100). Conversion Devices Inc, Brockton, MA. (508) 559-0880.
Intended for CRTs and other applications requiring high efficiency in low power ranges, the SHV series of high-voltage power supplies delivers 4 to 20W at 88% efficiency. The modules incorporate a horizontal sync-pin that lets you specify the same unit for a wide range of scan frequencies. Units are contained in a 3×4.5×1.9-in. package, with prices starting at $45 in high volume quantities. Keltron Power Systems Inc, Waltham, MA. (617) 894-8700.
Available in 400 and 600W models with one to five outputs, the Prism series of dc-power supplies features a submodular design that offers a narrow profile of 2.5×5 in. and a depth of 11 in. Main outputs deliver a maximum of 80 and 120A for the 400 and 600W units, respectively. Auxiliary outputs range from a minimum of 5A/60W for both units to a maximum of 50A/250W for the 400W unit and 75A/375W for the 600W unit. You can adjust output voltages of 2 to 48V dc ±10% from the front panel. Prices start at $485 for the 400W supplies and $592 for the 600W supplies (100). Jeta Power Systems Inc, Signal Hill, CA. (310) 427-0095.