Electronic Design


DC-DC Converters With 380-V Input Rated For 520 To 600 W
Modules in the MV380 series convert 380 V dc to 26 V, 48 V, or 56 V dc at 88% to 92% efficiency. They're rated from 520 to 600 W, and they achieve power densities up to 109 W/in.3 They come in an industry-standard, full-brick package that measures 0.5 by 2.4 by 4.6 in. Additionally, they're compatible with power-factor-corrected 600- and 1000-W UniVerter ac-dc converters for universal ac-dc applications. They're UL/CSA/TUV-compliant as well.

These converters operate at a constant frequency, using a low-noise ZVS architecture. Parallelable with current sharing for n+m redundancy, their full-rated output power is available over the −40°C to 100°C base-plate temperature. They include nonshutdown overvoltage protection, logic on/off, current limiting, and overtemperature shutdown at 105°C. Their output voltage can be externally trimmed, and they meet input-to-output isolation of 4500 V dc.

MV380 modules cost $225, or $199 each in 100-unit quantities. Availability is stock to 12 weeks.

RO Associates Inc., 246 Caspian Dr., P.O. Box 61419, Sunnyvale, CA 94088; (408) 744-1450; fax (408) 744-1521; www.roassoc.com.

DC-Coupled Amplifier Has Real-Time Analog And Digital Outputs
The Model 237 dc-coupled amplifier has a −3-dB bandwidth of 40 kHz. Its input can float at any potential between −20,000 and 20,000 V while its output is connected to ordinary lab instruments for data display and collection. An IR remote-control unit sets the power on/off and gain for hands-off operation. Four gain ranges are provided for four peak-to-peak input voltages. The input resistance is 1 MΩ on all ranges, and the input can withstand ±150 V without damage, whether the power is on or off.

Real-time analog and digital outputs are included. Its real-time analog output measures 0 to ±5 V full-scale. Two 8-bit bytes accompany the gain setting in the two most significant bits. Connects to computer parallel port with full handshaking is provided as well. Power comes from a dc "wall wart" supply of 15 to 20 V, and the input amplifier board uses three AAA batteries. Measuring 280 by 197 by 75 mm in a plastic enclosure, the 237 weighs just 890 g.

Single units cost $359, plus shipping. Availability is stock to four weeks.

TDL Technology Inc., 5260 Cochise Trail, Las Cruces, NM 88012-9736; (505) 382-3173; fax (505) 382-8810; www.zianet.com/tdl.

Transient Voltage Suppressor Suits Multi-SLIC Line Applications
The latest member of the battery-tracking TransClamp series of transient voltage suppressors, the TC04A-200, protects up to four tip & ring line pairs. With this performance, it's cost-effective for multi-SLIC line applications. It operates by tracking the voltage and firing when the line voltage exceeds the battery voltage, a process suitable for newer self-ringing SLIC ICs. Also, it fires from −5 to −100 V. With its 200-mA holding current, the TC04A won't latch up after the surge current subsides. Its surge-current rating is 100 A for a 10/1000-µs duration. And, it meets the Bellcore 1089 (long haul) requirement, along with the VDE 0433, ITU K20, and FCC Part 68 specifications.

The TC04A-200 costs $2.54 each in 1000-unit quantities.

Semtech Corp., 652 Mitchell Rd., Newbury Park, CA 91320; (805) 498-2111; www.semtech.com.

Regulator's Maximum Dropout Is 0.4 V In High-Radiation Conditions
A 3.3- to 2.5-V ultra-low dropout linear regulator, the OMR9601SCK features 3-A capability. Its maximum dropout voltage totals 0.4 V at 3 A output and 0.3 V at 1 A. Its remote shutdown pin can be used in power sequencing and other control functions. Housed in a five-pin TO-258 (MO-78AA), this regulator includes integrated input and output capacitors. It's also radiation-hardened to 1 Mrad (Si), and it's screened to class K standards as outlined in Mil-PRF-38534.

According to the company, this device was created after extensive ionizing radiation dose-rate testing on linear devices under a wide range of electrical and environmental conditions. It has been characterized per MIL-STD-883, Method 1019, Condition A (high dose rate). Also, it's been fully tested and characterized under very low dose-rate conditions to document the extremely low dose-rate symptoms (ELDRS) effect on bipolar linear devices.

In 25- to 99-lot quantities, this high-current regulator costs $400.

Omnirel, 205 Crawford St., Leominster, MA 01453; (973) 534-5776; fax (978) 537-4246; www.omnirel.com.

Current-Mode Switching Regulators Accept 2.7- To 30-V Inputs
The CS517x family of current-mode switching regulators features voltage inputs from 2.7 to 30 V while supporting five popular boost technologies applicable to many applications. These regulators solve distributed power problems with few external components. They include an on-board 1.5-A power switch, thermal shutdown, and 10-mA quiescent supply current in shutdown mode. Each model supports boost, flyback, forward, inverting, or SPEPIC power-supply topologies.

This family is pin-for-pin compatible with other switching regulators currently on the market. Its four commercial-grade (0°C to 70°C) models come in standard 8-lead small-outline ICs for greater design flexibility in a variety of applications. The CS5171 and CS5172 operate at a 270-kHz switching frequency, while the CS5173 and CS5174 run at 540 kHz. Industrial-grade products specified for −40°C through 85°C operation are available as well.

Pricing starts at $1.59 each in 10,000-unit quantities.

On Semiconductor, Semiconductor Components Industries LLC, P.O. Box 64222, Phoenix, AZ 85082-4222; (800) 282-9855; www.onsemi.com.

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