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Dear Sir/Madam
The life earth concert showed that protecting the environment is
now in everyone´s mind. By designing devices with extremely low
power consumption you can help to reach this goal. Helpful
information you´ll find in this newsletter. Enjoy!
Wolfgang Patelay
Technical Editor, EPN
20 to 40V Power MOSFETs (Vishay)
Vishay Intertechnology has added new N-channel 20, 30, and 40V
devices to its PolarPAK family of power MOSFETs with
double-sided cooling. The dual heat dissipation paths provided
by PolarPAK's double-sided cooling construction allow high
current densities in systems with forced air cooling, enabling
more compact designs and the ability to reduce the number of
paralleled MOSFETs.
Click here
High-Voltage Regulators (Torex Semiconductor)
Designed to operate with input voltages as high as 28V, the XC6216
CMOS LDO regulators are well suited for industrial and other
applications where nominal 24V supplies are commonly encountered. In
addition, the regulators consume only 5µA in normal operation,
falling to 0.1µA in standby mode.
Click here
Power
Resistors (Tyco)
Recently added to Tyco's CGS range of power resistors, the
aluminium-housed THS series is based on the high-performance HS
technology, and features the same basic performance levels but at a
lower cost. Encapsulated in silver aluminium housing, the resistors
are extremely stable, high-quality wirewound components capable of
dissipating high power in a limited space with relatively low
surface temperature.
Click here
High-Voltage IC with PFC (International Rectifier)
The
IRS2168D IC has been designed for advanced electronic linear
fluorescent lamp ballasts which incorporate active power factor
correction (PFC). It integrates PFC, ballast control and a 600V
half-bridge driver in a compact 16-lead SO package and features a
wide-range input-voltage PFC to simplify complex multi-lamp circuits
that include a fault counter on the current-sense pin for multi-lamp
ballasts and cycle-by-cycle protection on the PFC side for high
reliability.
Click here
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Removing Power Bottlenecks in SAR ADCs
Analogue-to-digital
converters (ADCs) based on successive approximation (SAR) are
popular because of their relatively low circuit complexity.
However, as the pressure on the sampling specs goes up, their
power consumption rises substantially. To overcome the major
power bottlenecks, a completely new architecture, developed at
IMEC and entirely operating in the charge domain, is coming to
the rescue.
Jan Craninckx and
Koen Snoeckx describe this aechi´tecture in detail in their
article in EPN.
Click
here
ADC
Design for Multichannel Power-Line Monitoring
Advances in microprocessor
technology and increasing staff costs are key drivers for power
companies to design new automated high-voltage (220kV and above)
substations using high-accuracy integrated automation systems.
Improved signal processing technologies make it possible to achieve
better than 0.1% accuracy in next-generation systems, as compared to
present systems' typical 0.5% accuracy levels.
Colm Slattery from Analog Devices
shows in his article that this improvement is mainly achieved with
the use of high-performance simultaneous-sampling ADCs.
Click here
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Circuit Breaker
provides Overcurrent and precise Overvoltage Protection
Requiring only a handful of inexpensive
components, the circuit breaker in Anthony H Smiths´ Design Idea
responds to both overcurrent- and overvoltage fault conditions.
At the heart of the circuit, an adjustable, precision,
shunt-voltage regulator provides a voltage reference,
comparator, and open-collector output, all integrated into a
three-pin package.
Click here
Photodiode
Amplifier exhibits one-third the Output Noise of Conventional
Transimpedance Amp
A conventional 1-MΩ
transimpedance amplifier has at least 130 nV√Hz of output-noise
density at room temperature. You can consider the 130 nV as the
theoretical noise floor limit of the amplifier because that is the
noise density of the 1-MΩ
resistor itself. Any noise in the op amp can only make things worse.
Cooling the resistor to 77.2K, the temperature of liquid nitrogen,
quiets it to 65 nV√Hz, provided that it survives, but is that the
only option? Can you beat the 130-nV theoretical noise floorwithout
cooling? The Design Idea by
Glen Brisebois from Linear Technology
shows
one way of doing this.
Click here
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4| Book of The Month |
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Switch-Mode Power Converters, by Keng Wu
This book introduces an innovative, highly analytical approach
to symbolic, closed-form solutions for switched-mode power
converter circuits. The author uses extensive equations to
explain how solid-state switches convert electrical voltages
from one level to another, so that electronic devices (e.g.,
audio speakers, CD players, DVD players, etc.) can use different
voltages more effectively to perform their various functions.
Click here
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EPN and EDN Europe are members of the Reed Electronics Group
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