Roberts Warr Electronics News & Resources

A new family of power - MOSFETS µCool™ has been introdued by ON Semiconductor. The device features good performance and design. flexibility.

“We have designed the µCool™ portfolio to exclusively address the unique power management challenges in portable devices such as lithium-ion battery charging circuits, high and low side load switches, and synchronous buck and boost circuits,” said Thibault Kassir, ON Semiconductor’s director. “These first µCool™ devices are just the beginning of what we expect will be an extensive portfolio utilizing our latest trench technology. Operating voltages will range from 8 V to 30 V and a variety of configurations will be offered - including single, dual, FETKy, complementary and integrated load switch.”

AT90PWMx AVR© by Atmel has been designed for lamp ballast and motor control applications. Both the 8-Kbyte Flash AT90PWM3 and AT90PWM2  allow high flexibility in controlling light levels, energy savings and easy to maintain. The 4-Kbyte Flash AT90PWM1 is cost effective.

The AT83EB5114 is available in a low-pin-count SO20 package and supports a 4-Kbyte ROM and a 256-byte EEPROM.

To reduce EMI by generating current in phase with the supplied voltage, the device requires a Power Factor Correction (PFC). In order to  manage the PFC functionality and control the lamp power, the microcontrollers have dedicated peripherals.

New modules for active PFC have been introduced by Tyco Electronics / Power Systems. The devices applications are: flowPFC0 >6kW (230V~ / 400Vdc, f=100kHz, Th=80°C):

P802-D30,40 / P803D-30,40 - CoolMOS+Tandem FRED

P800-D30,40 - CoolMOS+SiC-Diode

P804-D30 - Highspeed IGBT+Tandem FRED

The PFC Modules feature good performance PFC-boost circuit, dual boost circuits for paralleled or alternating switching mode, temperature sensor and low inductive design with integrated DC-capacitor.

The device’s applications are measurement applications do to the low HF-ripple on the output voltage. The SWR220 is switched on and off by an external 24V signal. It’s also got an internal fan that transports the heat out of the unit. The voltage - ether 115Vac or 230Vac - can be chosen on the bach panel of the unit. The dimension of the SWR220 is 92 x 190 x 341mm.

The 150-watt MPM-815H AC/DC medical grade switching power supply has been introduced by Magic Power Technology Inc. The device fits within 1U height constraints. It’s ideal to be placed in the patients’ room as it makes no noise.

The device has got universal input, can generate 50 watts at 50 degree Celsius under convection cooling, has ATX output option, power fail signals and remote ON/OFF function.
The MPM-815H design makes the device very reliable and reduces the dust into system.

The MPU100 Series if 100W AC/DC external power supplies have been introduced by Power Sources Unlimited. The device measures 7.44″ x 3.52″ x 1.79″. Its input is 4000VAC. The efficiency is 83% and the operating temperature 0 to 70 degrees Celsius.

The models are available in single, dual and triple output. Both input line aas well as neutral meet safety certification. The units meet EN55011 Class B emissions.

The rugged 70W-150W dc/dc converters of IEXR and IEHR Series have been introduced bt Schaefer, Inc. Their applications are: industrial installations, process control and instrumentation.

The input voltage ranges from 10-16VDC, 21-60VDC to 60-132VDC; nominal output: 70W to 150W and single output:  8VDC to 52VDC.

The design of the device features fused input protection, output protection for short circuit and overload conditions,  input transient protection and reverse polarity protection. The efficiency is 80%.

The First Dual Channel Switch Mode has been introduced by AMREL Inc. It’s the first Power Supply (SPD) under 600W. The device features power from 300 to 360W, packaging in 19″ 1U high box and voltages from 8Vdc up to 300Vdc.

The SPD, having front panel keypad, voltage tracking function and a VFD display giving the information for each channel, is easy to use.

The SPD models are available in GPIB & RS-232 (Standard) and USB & Ethernet (Optional). Also RS-485 is available. It allows simple system and power expansion.

The device is very accurate and it matches its linear power supply counterpart.

The new Acopian’s power supply, even though being small, provides up to 288 Watts of DC. They can be fitted is spaces where there is not much room.

The new DC-DC converter features outputs from 3.3 to 125 Vdc, input range from 2:1 to 4:1, protection against overload, short circuit and overvoltage.

The efficiency of the device is 65 to 80%. The operating temperature is from 0 to +71 degrees C, whereas the storage temperature: from -40 to +85 degrees.

The MPU50 Series of 50W AC/DC external power supplies have been introduced by Power Sources Unlimited. The device is very small and measures only 5.75″ x 2.99″ x 1.69″.

Its features are: safety ground leakage current of 0.1mA at 240VAC, 83% efficiency, the operating temperature of 0C to 70C.

The devices are available in single, dual and triple output models and have a 90-264VAC input. The load regulation is 0.5% and 3%, respectively.