Power Electronics

New Products

Buck Converter

Maxim Integrated Products MAX8805Y/MAX8805Z are 600-mA PWM stepdown converters designed for multiband WCDMA/NCDMA applications. The devices integrate a 60-mΩ bypass MOSFET that provides 1.5 A of peak current. Each device automatically enters bypass mode if the required output voltage is within 92% of the input voltage. The user can force the IC into bypass mode using logic. The 7.5-µs slew rate of the output voltage ensures margin to the CDMA-required 50 s. The devices also include two low-noise LDO regulators. Available with either a 2-MHz (MAX8805Y) or 4-MHz (MAX8805Z) switching frequency, both devices are available in a 16-bump, 2-mm × 2-mm × 0.7-mm wafer-level package. Prices start at $1.75 for 2500 pieces.
Maxim Integrated Products
Sunnyvale, Calif

Complementary MOSFETs

The FDD8424H from Fairchild Semiconductor is a complementary 40-V MOSFET module that provides dual DPAK packaging and thermal dissipation. Optimized for half- or full-bridge inverter designs, the FDD8424H is suited for LCD-backlighting. The integration of a p-channel high-side MOSFET and a n-channel low-side MOSFET into a single package allows a common drain connection within the device. Both RDS(ON) and gate charge are low for good switching performance. Pricing is $0.69 for 1000 pieces.

LCD Bias Generator

The TPS65165 power-management IC from Texas Instruments is an LCD biasing IC that integrates three 50-MHz operational amplifiers to effectively control gamma correction and the VCOM power supply. The IC generates all three voltage rails for TFT-LCD displays (VS, VGL and VGH) and supports output voltages up to 18 V while operating at a 600-kHz fixed frequency. Other features include a 2.5-V to 6.0-V input-voltage range and high-voltage stress testing. The IC is available now and packaged in a 40-pin 5-mm × 5-mm QFN. Pricing is $1.80 in 1000-unit quantities.
Texas Instruments

Fairchild Semiconductor
South Portland, Maine


Induction Motor Design Kit

Powerex's recently introduced BCIM reference design kit features a board and a parts kit containing a three-phase ac induction-motor controller at its core. Designed to provide an interface between the controller and Powerex IPM design kits, the BCIM board provides PWM signals for the IGBTs in the three legs of a three-phase inverter plus a brake signal. The BP7B is a complete isolated interface circuit for six- and seven-pac low- and medium-power Powerex L-Series IPMs. The BP7B circuit features the VLA606-01R optical-interface IC for isolation of control signals and isolated power supplies for the IPM's built-in gate drive and protection circuits. Samples of the BCIM design kit are available at $240 each.
Youngwood, Penn.


Harsh-Environment DC-DC Converter

Century Electronics' model DC500 dc-dc converter provides up to 560 W of output power with 90% efficiency. The converter operates at 28-V input in accordance with MILSTD-704 Magnetic Isolation. The power supply is unaffected by time, temperature or radiation, as the feedback circuit does not use opto-couplers. A primary-current-sense transformer and a secondary-output current-sense resistor are used for output short-circuit and current-limit protection, creating higher reliability. Soldering is not required for interface connection with the module, as D-type input and output connectors are used. The input connector is an integral part of the six-side shielded-EMI input filters. Input inrush current is less than 50 A. The unit is sized at 6 in. × 5 in. × 1 in. and weighs 1.85 lbs.
Century Electronics
Westlake Village, Calif

Circular Connector

Positronic's King Cobra circular connector series is molded of lightweight, noncorrodible composite materials. A “Twist-lock” mechanism secures the mated connector pair. Features include contact sizes 22, 20 and 16 for signal and power applications; environmental options that meet the requirements of IP65; right-angle and straight pc-board mount terminations; cable terminations and accessories.
Springfield, Mo

Industrial Off-Line Converter

Absopulse Electronics' HVC 2K series is an ac-dc power supply developed for operation in industrial environments. It delivers up to 3000 W at 85 Vdc, 125 Vdc, 136 Vdc, 250 Vdc, 300 Vdc or 400 Vdc. The standard-unit input accepts a 230 Vac (±15%) input, with 115 Vac or a range of dc inputs available on request. An optional redundancy diode allows for parallel connection to achieve higher output power, N+1 redundancy, or to float-charge a battery. Sized at 11.5 in. × 5.3 in. × 16.25 in., the fan-cooled unit has a MTBF exceeding 100,000 hours. The standard HVC 2K is priced in the range of $1454 to $1565 each for 10 units, depending on options and power level.
Absopulse Electronics
Ottawa, Ontario, Canada


Miniature DC-DC Converter

C&D Technologies' NMJ series of 1-W dc-dc converters is housed in fully encapsulated, UL 94V-0-rated, 7-pin SIP packages with a footprint of 1.91 cm2. The series includes eight single-output models. The single- and dual-output converters use internal SMD construction and toroidal magnetics to achieve a power density of 0.42 W/cm3. The complete NMJ series provides engineers with a choice of 5-V or 12-V inputs. Available with outputs of 5 V, 9 V and 15 V, the NMJ is production-tested for 5.2-kVdc isolation at full load, without heatsinking, between -40°C and +60°C. MTTF is calculated at 11 million hours. Volume pricing is $6.
C&D Technologies
Mansfield, Mass.

Two-Phase Input Power Supplies

Automation Systems Interconnect's line of two-phase-input, DIN rail-mounted power supplies — the CSB and CSW series — have been designed to operate using only two legs of a three-phase circuit. The CSB series has an input of 340 Vac to 550 Vac, and the CSW series has an input of 185 Vac to 550 Vac, in both single- and two-phase operation. This solution provides the same output power as a three-phase power supply. The CSB series are available with a 24-Vdc regulated output rated at 6-A, and a 48-Vdc regulated output rated at 3 A. The CSW series 24-Vdc power supplies are available with 5-A and 10-A capacities, and 12-Vdc to 15-Vdc adjustable versions rated for 7-A to 8-A, and 15-A to 16-A. A 48-Vdc model is rated for 5 A.
Automation Systems Interconnect
Carlisle, Penn

Low-Voltage Motor Drive

International Rectifier's IRS200x family of half-bridge, high-side and low-side 200-V driver ICs target low-voltage (24-V, 36-V and 48-V) and mid-voltage (60-V, 80-V and 100-V) motor-drive applications. This includes both three-phase inverters and half-bridge drivers. The IRS200x devices are offered in eight-pin SOIC and DIP packages and feature output voltages up to 20 V, turn-on current of 290 mA, turn-off current of 600 mA, and accept input logic levels of 3.3 V, 5 V and 15 V. The IRS200(1,3,4)(S) devices are available in 100,000-unit quantities at $0.60 each.
International Rectifier
El Segundo, Calif

Flexible-Input Switchers

Acopian's single-output Narrow Profile power supplies can be used on either ac or dc input. They are available in over 150 models that provide from 3.3 V to 125 V and deliver up to 288 W. The output is floating and may be used in either polarity. Models with outputs greater that 120 W have PFC and output-inhibit capability; applying between +3 Vdc and +25 Vdc to the inhibit terminal will disable the output. Measuring 1.7 in. × 3.5 in. × 7 in., these 100-kHz switchers include an input filter and feature a line regulation of ±0.05% and load regulation of ±0.05%. Transient response is 300 µs for a load-step change from 50% to 100%. Pricing is $185.
Easton, Penn

Dual Stepdown Converter

Linear Technology's LTC3419/-1 dual-output, high-efficiency 2.25-MHz synchronous buck regulator can deliver up to 600 mA of continuous-output current from each channel. Using a constant-frequency current-mode architecture, the input-voltage range is 2.5 V to 5.5 V. It can generate two independent output voltages as low as 0.6 V. The LTC3419-1 fixed-output-voltage version is also available with 1.575-V and 1.8-V outputs. Efficiencies reach 96%. The LTC3419EDD and LTC3419-1EDD are both available in a DFN-8. The LTC3419EMS and LTC3419EMS-1 are available in an MSOP package. Pricing for all versions starts at $1.95 each for 1000 pieces.
Linear Technology
Milpitas, Calif

Single-Chip Inverters

Toshiba Electronics Europe's (TEE) generation of single-chip inverters is intended for brushless dc (BLDC) motor applications. Available in PWM and non-PWM versions, the chips combine high- and low-side drivers with six IGBTs, and integrated fast-recovery bootstrap diodes. The 250-V single-chip inverters offer a 1-A output current, while the 500-V versions are available with output currents of 1 A, 2 A or 3 A. All of the inverters can interface directly with a host microprocessor. The DIP26 package is 32 mm × 13 mm × 3.8 mm. Toshiba's six-input 500-V/2-A and 500-V/3-A single-chip inverters are in mass production now.
Toshiba Electronics Europe
Düsseldorf, Germany


Counter-Rotating Cooling Fan

Sanyo Denki's San Ace 60CR is a 60-mm counter-rotating dc cooling fan available in 12-V S-speed and H-speed models. Maximum airflow is 2.26 m3/min, and static pressure is as high as 550 Pa. The fan features power consumption as low as 32.4 W, minimum noise generation is 64 dB and L10 life expectancy is 40,000 hours at 60°C. Optional features of the RoHS-compliant cooling fan include tachometer sensor and lock rotor sensor outputs, and PWM control. The fans are available now, priced at $36 each.
Sanyo Denki


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