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new products
dimming. The switching frequency is adjustable in
the range of 200 kHz to 700 kHz. The adjustable soft
start feature limits the current peak as well as voltage
overshoots at start-up.
LED system cost reduction with LITIX Power
TLD5190QV
The LITIX Power family of DC/DC converters and
controllers targets medium-power to high-power
applications. These comprise LED daytime running
lights and LED low-beam and high-beam. The new
family member TLD5190QV is a synchronous H-bridge
DC/DC controller with similar features as the TLD5541-
1QV. Without SPI interface it particularly suits LED
control electronics where no microcontroller is needed,
while it is easy to implement. The device also offers
integrated protection functions, both analog and digital
(PWM) dimming and an adjustable switching frequency
in the range of 200 kHz to 700 kHz.
Availability and packaging
The synchronous H-bridge DC/DC controllers TLD5541-
1QV TLD5190QV are already in volume production and
available in VQFN-48 packages. Both LED drivers are
suitable for use in harsh automotive environments and
specified according to AEC-Q100. Infineon supports the
design-in with demo boards, data sheets and PSpice
simulation models.
Further information on the complete LITIX portfolio is
available at
www.infineon.com/LITIX60V I²C Battery Monitor Measures State of
Charge Parameters with 1% Accuracy
ON Semiconductor (Nasdaq: ON), driving energy
efficient innovations, has utilized its strength and
depth in a broad range of semiconductor disciplines
– including analog, power management, sensor
interface and signal conditioning – to introduce a
comprehensive development resource for the wearable
electronics sector. The newWearable Development Kit
(WDK1.0) combines a wide array of highly optimized
components, with the objective of assisting OEMs in
bringing differentiated products to market. Using it can
significantly accelerate design cycles for wearable
electronics while mitigating heavy engineering costs.
“Despite the growing interest in wearable electronics,
to date there is simply not a solution on the market
that provides the scope needed by OEMs to help them
develop feature rich designs that will attract strong
consumer uptake,” states AJ ElJallad, senior manager,
corporate strategy and business development at ON
Semiconductor. “The WDK1.0 is a multi-faceted design
asset that will allow wearable technology projects to be
expedited – shortening time to market and curbing the
associated investment in engineering by leveraging the
extent of ON Semiconductor’s product portfolio.”
For this new offering, a high efficiency programmable
NCP6915 Power Management IC provides 5 LDOs
and 1 DC-DC to support power requirement for
the smartwatch and for additional development
requirements. An NCP1855 battery charger IC, plus
an LC709203F fuel gauge and a 10 watt (W) rated
SCY1751 wireless charging front-end controller
(supporting AirFuel compatible magnetic resonance
charging) have also been incorporated. The kit’s sensor
capabilities stem from the MEMS-based FIS1100 inertial
measurement unit (IMU), with 3‐axis gyroscope and 3‐
axis accelerometer operation enabling accurate multi-
dimensional motion tracking. There is also an embedded
temperature sensor included and an LC898301 driver
IC for initiating haptic feedback.
Critical to the WDK1.0 is its wireless connectivity,
which is addressed via an ultra-lower power nRF52832
multi-protocol system-on-chip (SoC) from Nordic
Semiconductor. This features a 32-bit ARM® Cortex™
processor core and a 2.4GHz transceiver – offering
support for Bluetooth Low Energy (BLE) and other
relevant wireless technologies. The kit is complemented
by a SmartApp which can be downloaded directly from
Android PlayStore and Apple AppStore. Using this,
various pieces of information can be transposed, such
as the steps taken, calories burnt, distance covered
and activity period, as well as human machine interface
aspects like screen brightness adjustment, clock face
control, alarm settings and establishing fitness goals. An
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