Portable Electronics Schottkys
These 20V, 30V, and 40V Schottky rectifiers are housed in industry-standard surface-mount (SOD-123 and SOD-323) and axial-lead (C-16 and DO-41/DO-204AL) packages. Matching industry-standard specifications and performance for drop-in replacement in existing designs, they are suitable for space-constrained applications, such as cell phones, PDAs, MP3 players, digital cameras, and laptops.
International Rectifier, El Segundo, Calif.
Efficient DC-DC Controller
The MAX1953, PWM step-down dc-dc controller powers core, I/O, and memory supplies. Its 1 MHz current-mode operation provides transient response and reduces output size, cost, and capacitance. It addresses low-input 3.3V and 5V bus applications — without a charge pump and features adjustable current-limit and short-circuit protection — without current-sense resistors. Output voltage range extends from 0.8V to 0.86VIN. It provides loop bandwidth in excess of 100 kHz and is 92% efficient.
Maxim Integrated Products, Sunnyvale, Calif.
GUI Interface for Programmable Supplies
A free graphical user interface (GUI) is available for DLM and DCS families of programmable dc power supplies. The Windows-executable program allows users of DLM and DCS power supplies to control the programming, monitoring, and operation from a PC through an IEEE or RS232 interface — without needing SCPI commands.
Sorensen Div. of Elgar, San Diego
Fan Motor Control IC
Integrating rotational speed sensing, locked rotor detection, and automatic recovery functions into the ultra small MSOP10 package, the ZXBM2000 Series of controller ICs offers a complete variable speed control solution for 2-phase, dc brushless fan and blower motors up to 100W. It delivers up to 80mA to a pair of external MOSFET or bipolar transistors connected to the fan motor windings and can use 4-pin “naked” Hall sensors or 3-pin buffered switching types.
Zetex Inc., Hauppauge, N.Y.
Tantalum SMT Capacitor
The T530 Series tantalum surface-mount capacitors employ a polymer material to replace the MnO2 used in traditional capacitors. This provides nonignition, self-healing, 125°C performance capability with a higher conductivity material that lowers the ESR. Packaged as multiple anodes to reduce depth that the signal must penetrate, this parallel arrangement further reduces the ESR to achieve high capacitance and an ESR of 7mW. Capacitance value range is 330μF to 1000μF, voltage range is 3V to 10V, and maximum temperature capability is 125°C.
Kemet Electronics Corp. Greenville, S.C.
The FAN4822 PFC controller is an average-current boost-type IC, employing ZVS control for operation at high switching frequencies. Used for power supplies of 500W or more, it allows high power factor and low total harmonic distortion. The ZVS circuitry allows smaller, low-cost components to save space while reducing switching losses and noise caused by EMI. Features include undervoltage lockout, overvoltage protection, and input-voltage brownout protection.
Fairchild Semiconductor, San Jose, Calif.
40A Quarter-brick Converter
The QTA series of 40A quarter-brick-sized isolated dc/dc converters can deliver up to 40A total output of 1.2V to 2.5V and 35A at 3.3V, without needing an attached heat sink. The series has a 48V nominal input of 35V to 75V and meets input voltage transient requirements up to 100V for 100 ms. The unit measures 1.45 in. × 2.3 in., and has a 0.43 in. profile. The module uses synchronous rectification and features a full-load efficiency of 82% at 1.2Vout (87% at half-load) and 90.5% at 3.3Vout (92% at half-load).
SynQor, Hudson, Mass.
Dual-Channel Power Regulator
The LX8817™ is a 2.5A dual-channel positive-voltage linear regulator with one fixed and one adjustable output. Dual inputs provide separate sources for a circuit's control and power sections. Applications include 3.3V to 2.5V adjustable linear regulators, low-voltage logic supplies, active SCSI terminators, and PC peripherals. Internal voltage reference of output voltages is ±1% of its specified value. Maximum dropout is 0.6V at rated current.
Microsemi Corp., Irvine, Calif.
Current Sense Resistor
The CC1512 is a compact flip-chip style, current sense chip resistor, available from 0.010Ω to 10Ω. It offers noninductive performance and is rated for 0.75W on standard glass epoxy-type PCBs (FR-4, etc.); higher power dissipation is available on advanced thermal substrate designs. Typical applications include power supplies, motor controls, and battery management. Prototype quantities are available from stock, and manufacturing quantities are available in four weeks ARO.
Caddock Electronics Inc., Roseburg, Ore.
The SMP 1812 Series of SMT high-efficiency power inductors enables the design of higher current handling capability for dc-dc converters and power supply applications where high performance and space are critical. Inductance ranges from 1μH to 330μH, current ratings from 2018mA to 124mA, and saturation current from 2,500mA to 129mA.
Gowanda Electronics, Gowanda, N.Y.
Production Safety Tester
The Guardian 6100 performs the electrical safety tests required in the production of electronic medical products. Without changing the connection to the device under test, it performs up to nine tests in sequence and in accordance with UL, CSA, IEC standards, such as UL2601-1, UI-1563, UL1950, UL544 and IEC60601. Leakage tests include Earth, Enclosure, Patient, and Patient Auxiliary Leakage. It also monitors power consumption (VA), ac and dc hipot, insulation resistance, and ground bond.
QuadTech Inc., Maynard, Mass.
The 2,700 F TC2700 family of low-cost, high-durability, large-cell ultracapacitors meets energy storage requirements of the transportation and industrial markets. While reducing cost and improving performance and reliability, it provides a platform for conversion of mechanical functions, such as steering, braking, and air conditioning.
Maxwell Technologies, San Diego
Linear AC Power Sources
The AMX Series of high-performance linear ac power sources is part of the Smartsource™ line. Output power ranges from 500VA to 12kVA in single-phase, split-phase, or 3-phase modes. For applications requiring more power, select models may be connected in parallel for output up to 30kVA. Available with manual or programmable controllers, it produces high-quality, low-distortion output power into dynamic loads.
Pacific Power Source, Irvine, Calif.
Fast Rise-Time DIAC
The surface-mountable SMDB3 is a trigger diode with a fixed voltage reference. Its rise time of 0.50 μs leads to the transfer of more energy in less time. It has a breakover of 10μA and a leakage of 1μA. Typical breakover voltage is 32V (with 22 nF in parallel). Dynamic breakover voltage is 10V and breakover voltage asymmetry is a maximum of 3V in both directions.
STMicroelectronics, Lexington, Mass.
10A DC-DC Converters
Austin Lynx™ nonisolated dc-dc converters power low-voltage components. An intermediate bus voltage of 3Vdc to 5.5Vdc can be converted to a single output from 0.9Vdc to 3.3Vdc. Capable of 10A output, the SIP (50.8 mm × 12.7 mm × 8.4 mm) is for through-hole, vertically oriented connections, while the SMT (33 mm × 13.5mm × 7.4 mm) is for automated surface-mount assembly.
Tyco Electronics, Dallas
Multifuse® Product Line Multifuse® MF-R055/90 and MF-R075/90 hold currents of 550mA and 750mA, respectively. They protect against overcurrents caused by power cross faults. These temperature coefficient resettable fuses are made of a conductive polymer exhibiting a positive PTC effect, which responds to increases in current by changing from a low- to a high-resistance state.
Bourns, Riverside, Calif.
1700V IGBT Series
The expanded 1700V IGBT, KA-Series incorporates a planar chip that's fine line processed. It uses a buffer layer with local lifetime control to optimize on-state and switching losses. Use it at operating frequencies of 15 kHz with 30% to 50% lower total power loss than competitive devices. Offered in a six-in-one package with current ratings of 75A, it uses a fast- and soft-recovery diode to reduce EMI and turn-on power loss.
Powerex, Youngwood, Pa.
SMT Current Sense Resistor
OARSZ open-air current sense jumper resistors enable circuit designers to crossover a trace on a p. c. board, handling up to 65A. Separation of the solder pads and the height of the device above the circuit board is the only limit for the dielectric withstanding voltage. Resistance is less than 1mΩ. Measuring 0.125 in. (W) × 0.440 in. (L), operating temperature ranges from -55°C to 160°C.
IRC Wirewound and Film Technologies Div., Boone, N.C.
Low-Voltage Analog Switches
The ISL5120, ISL5121, ISL5122, and ISL5123 switches offer 19O on-resistance 28/20ns (TON/TOFF) switching times. Operation is from a single 2.7V to 12V (15V max) supply. With wide bandwidth and high off-isolation and crosstalk rejection, signal response is flat — even past 300 MHz. They are available as dual SPST or SPDT configurations in the SOIC or smaller SOT-23 packages in industry-standard pin configurations.
Intersil Corp., Palm Bay, Fla.
Toroidal Power Transformers
These standard toroidal power transformers cover power ranges from 20VA to 3000VA, and meet safety requirements for UL544, UL1411, UL478, and IEC601. Their advantages over laminated constructions include 30% to 50% lower weight and size, very low electromagnetic radiation, better voltage regulation, very high efficiency, lower off-load power consumption, and up to 90% less mechanical hum.
Bicron, Canaan, Conn.
Type 4CMC p. c. board-mount capacitor offers about 50% more capacitance than comparable, same-size screw terminal capacitors. The extended cathode foil assures cool operation and increased ripple current capability of 15% to 30%. It doubles board energy and handles up to 50A of ripple. Capacitance is up to 420,000μF at 16V, 14,000μF at 200V and 2,300μF at 500V. Featuring three 0.062 in. diameters copper mounting pins, case sizes are from 1.375 in. × 1.75 in. to 2 in. × 5.75 in.
Cornell Dubilier, Liberty, S.C.
Designated Type B82472-G, these 7 mm × 7 mm power inductors are magnetically shielded, with an inductance range from 1.0 μH to 22 μH. Future versions, B82462 and B82464, will be 6 mm × 6 mm and 10 mm × 10 mm, with lead-free construction, low dc resistance, low height profile, high current handling capability, and operation up to 125°C ambient temperatures. They will be available in standard or low height profiles and in magnetically shielded or unshielded versions.
EPCOS, Iselin, N.J.
EM Field Analysis Software
Version 6 of the electromagnetic field analysis software has a geometric modeler and plug-ins to leading 3-D solid modeling CAD packages. Offering seven major changes, it provides users with tools for creating a device's physical geometry. Switching from 2- to 3-D mode, the software converts regions into surfaces. Users can choose the self-adaptive solver type to automatically generate an element distribution on the model.
Integrated Engineering Software, Winnipeg, MB, Canada
These self-leaded, flat wire, surface-mount DR356 Series inductors are cost and space efficient for dc-dc converter and switchmode supply applications. Their low profile, flattop design is ideal for pick and place manufacturing. Inductance range is from 580 nH to 2.3 μH (20%), and a rated current is from 22A to12A. The DCR is 1.45W to 4.3W. Maximum height for the DR356-1 is 0.185 in., with a footprint of 0.50 in. × 0.50 in. The DR356-2 maximum height is 0.197 in., with a footprint of 0.50 in. (12.6 mm) × 0.50 in. (12.6 mm).
Datatronic Distribution Inc., Romoland, Calif.
The S-8130 Series temperature switch with latch inverts the output signal when the temperature limit is reached. It features a low quiescent current of 15μA, low-voltage operation of 2.2V, and operation temperatures of — 40°C to 100°C. The S-8130 Series has a temperature sensor with a coefficient of -13 mV/°C, a comparator, voltage detection circuit, and noise suppression circuit enclosed in an 8-pin MSOP package.
Seiko Instruments, Torrance, Calif.