80 / 84
new products
Allegro MicroSystems, LLC Announces New
High Current Integrated DC Motor Driver IC
Allegro MicroSystems, LLC announces a new motor driver
IC designed for pulse-width-modulated (PWM) control
of DC motors. Allegro’s A5950 is capable of peak output
currents up to ±3 A and operating voltages up to 40 V. This
new device is targeted at the automotive market with end
applications to include heads-up-display, shift drive, door
closure and engine thermal management applications. It is
also targeted at the commercial market to drive brush DC
motors for ATM cash dispensers, robotic vacuums, printers,
copiers and ticketing and vending applications.
Input terminals are provided for use in controlling the speed,
direction and torque of a DC motor with externally applied
PWM control signals. Internal synchronous rectification
control circuitry is provided to lower power dissipation
during PWM operation and low current standby mode is
included to improve efficiency. Internal circuit protection
includes overcurrent protection, motor lead short to ground
or supply, thermal shutdown with hysteresis, undervoltage
monitoring of VBB, and crossover-current protection.
Diagnostic features include an analog output that can be
used to monitor the current through the external sense
resistor and an open drain FAULTn output.
The A5950 is supplied in a low-profile 4 mm × 4 mm,
16-contact QFN (suffix “EU”) package with wettable flank
option (suffix “-J”), or a 16-lead eTSSOP (suffix “LP”), both
with exposed power tab for enhanced thermal performance.
Allegro MicroSystems, LLC is a leader in developing,
manufacturing
and
marketing
high-performance
semiconductors. Allegro’s innovative solutions serve
high-growth applications within the automotive market,
with additional focus on office automation, industrial,
and consumer/communications solutions. Allegro is
headquartered in Worcester, Massachusetts (USA) with
design, applications, and sales support centers located
worldwide. Further information about Allegro can be found
at
www.allegromicro.com.
CUI Further Expands Thermal
Management Portfolio with New Line of Heat
Sinks
CUI’s Thermal Management Group today announced
an expansion to its existing portfolio of Peltier devices
and dc fans with the addition of a heat sink product
line. The new line of aluminum heat sinks, available in
both extruded and stamped versions, are compatible
with TO-218, TO-220, TO-252, and TO-263 transistor
packages. Designed to improve the heat dissipation
of low and high power board level applications, these
stampings and extrusions are conveniently measured
under four conditions for thermal resistance, making
it easier to select the optimal heat sink for natural
convection or forced air cooled systems.
The extruded and stamped heat sinks offer tin plated or
black anodized material finishes and are available with or
without solder pins in vertical or horizontal orientations.
Thermal resistances measured at 75°C ΔT in natural
convection environments are as low as 4.49°C/W, while
power dissipation ratings measure up to 16.7 W at 75°C
ΔT in natural convection.
Along with their standard form factors and sizes, CUI
also offers a range of custom heat sink capabilities. With
alternate production methods such as forging and die
casting as well as extrusions and stampings, CUI can
create virtually any shape or profile to fit specific design
needs. A variety of additional materials and finishes
are available, including clear and color anodization,
chromate powder coating, and nickel or zinc plating.
Hole punching for custom mounting patterns is also an
option. In addition, CUI’s standard or custom heat sinks
can be integrated with any of its current Peltier and dc
fan offerings to achieve more complex thermal solutions.
“At CUI, we see the development and expansion of
our thermal management product line as a natural
complement to our industry leading portfolio of power
products,” stated Kraig Kawada, CUI’s VP of Product
Management. “As the heat in applications continues to
rise due to increasing power densities, we believe that
the introduction of these heat sinks, alongwith our current
Peltier devices and dc fans will assist our customers in
meeting their growing thermal management challenges.”
80 l New-Tech Magazine Europe