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Dear Sir/Madam
less power consumption protects the environment. Therefore the
electronics industry develops permanently new methods and
technologies to save power in all kinds of devices. This
newsletter shows some examples. Enjoy it!
Wolfgang
Patelay
Technical
Editor EPN
Trench Gate IGBT Modules (Advanced Power Technology)
Advanced Power Technology has extended its line of Field Stop,
trench gate IGBT power modules with 600, 1200 and 1700V devices
in SP4 and SP6 packages. All units offer minimum VCE (sat)
saturation voltage of typically 1.5V for 600V, 1.7V for 1200V
and 2V for 1700V. They are dedicated to low-frequency operation
where overall system efficiency is a concern. The optimum
switching frequency is 20kHz for 600V products, 10 to 20kHz for
1200V products and up to 10kHz for 1700V products.
Click here
SMD
Power Inductors (TDK)
The VLF 5014 has a mount area of 4.5x4.7mm as well as
a 1.4mm profile. When combined with the functionality of higher
current handling, the product is well-suited to power LED
flash-driver circuits, for use as flashlights in mobile handsets.
The VLF5014 is particularly applicable to the LED flash DC/DC
converter for higher power LEDs (1.2A or greater). The VLF 4014 and
VLF 3014 measure 3.5x3.7x1.4mm and 2.6x2.8x1.4mm respectively. All
inductors feature a high-magnetic-shield construction for EMC
protection.
All
three chips are fully RoHS-compliant.
Click here
DirectFET Chip Set (International
Rectifier)
The
IRF6619 and IRF6633 chip set has been designed for high-frequency,
high-current DC/DC converters used to power advanced telecom and
datacom systems as well as Intel and AMD processors. It replaces
four standard D-Pak MOSFETs per phase in processor power systems,
cutting component count in half and reducing MOSFET board space by
over 50% per phase.
Click here
Power-Management ICs (Microchip)
The
TC1303/TC1304 and TC1313 series of power-management ICs combine a
synchronous buck-switching regulator, low dropout (LDO) regulator
and power-good function into single-chip solutions. All five device
options include the 500mA Buck regulator and the 300mA LDO. The
difference between the devices lies in the power-good function (the
TC1313 doesn't have any).
Click here
Coordinated Circuit Protection Helps Protect AC Mains Equipment
Because overcurrent and overvoltage protection are often viewed
as two unrelated elements of the circuit-protection design
process, protection strategies can result in costly
multi-component solutions, and there is a risk of synergies
between protective devices being overlooked. This article by
Matthew Chamberlain from Tyco
illustrates how coordinated protection helps designers enhance
equipment reliability, reduce component count and meet critical
safety agency requirements.
Click here
Virtual-current mode: current-mode control without the noise
The two most common forms of control in dc/dc
switching power converters are CM (current-mode) and VM
(voltage-mode) control. Each method has its own advantages and
disadvantages. Bob Bell from National
Semiconductor explains in his Design Idea in EDN how a new
dc/dc-switching-regulator design approach combines the best features
of current- and voltage-mode control.
Click here
Op amp can source or sink current
When you design for electronics applications, such as sensor or
amplifier bias supplies or special waveform generators, a
controlled constant-current source or sink circuit can serve as
a useful building block. Alfredo H Saab and
Steve Logan from Maxim are showing in their Design Idea an op
amp can act as such a circuit which exhibit high
dynamic-output impedance and deliver relatively large currents
within an allowed range of compliance voltage.
Click here
Shunt
regulator improves power amplifier's current-limit accuracy
In
this Design Idea John Guy, from Maxim explains how adding
current-limiting circuitry to a power amplifier's or a linear
voltage regulator's emitter-follower output stage protects both the
output transistor and the downstream circuitry from
excessive-current damage.
Click here
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4| Book of The Month |
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Electric Drives and Electromechanical Systems, by Richard
Crowder
The focus of this book on the selection and application of
electrical drives and control systems for electromechanical and
mechatronics applications make it uniquely useful for engineers
in industry working with machines and drives. It also serves as
a student text for courses on motors and drives, and engineering
design courses, especially within mechanical engineering and
mechatronics degree programs.
Click here
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5| Competition |
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Power-Factor-Correction Control Design Kit
The universal reference kit for the IR1150 Power Factor
Correction (PFC) IC from International Rectifier comes as a
small, 710mm2, fully-assembled PFC control circuit
that engineers can drop into an existing power supply, replacing
the old continuous conduction mode (CCM) PFC circuit. Worth over
$160 each, eight such kits are on offer in this issue, jointly
given away by the manufacturer and its pan-European distribution
partner Future Electronics, for EPN readers to win.
Click here
▪
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Copyright 2006,
Reed
Business Information.
EPN and EDN Europe are members of the Reed
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