Magnetics Business & Technology - March/April 2025 - 22

PRODUCT NEWS
Ultra-Compact Magnetics & GaN Enable Design Breakthrough by Pulsiv
Pulsiv Limited, a Cambridge, UK innovator of power electronics
technology, has developed what it says is the world's most
efficient 65W USB-C GaN optimized reference design to address
the complex challenges associated with thermal performance in
power supplies. Highly optimized ultra-compact magnetics from
Frenetic help make the breakthrough possible.
The advancement could revolutionize the USB-C fast charging
space by offering a unique combination of features and benefits
not seen in other designs. The PSV-RDAD-65USB reference design
combines Pulsiv OSMIUM technology with an industry standard
QR Flyback and the specially designed magnetic elements.
It represents the first in a series of designs aimed at pushing the
boundaries of power conversion by drastically lowering operating
temperatures, minimizing losses, and reducing size to create a
sustainable platform for the USB-C standard.
Dr. Tim Moore, chief
product officer for
Pulsiv
" Our mantra has always been focused
on developing solutions that 'do more
while using less' and this design demonstrates
how Pulsiv OSMIUM technology
can deliver fast charging without the
associated complexity of managing high
temperatures, " explains Dr. Tim Moore,
chief product officer for Pulsiv. " The demand
for more power and faster charging
of cordless products is rapidly increasing
which impacts everything from mobile
phones to power tools. This means more
power is needed in a small form factor
which is even more critical when developing
in-wall/desk solutions which are sensitive to heat. With
30% lower component temperatures, no inrush current, and high
efficiency, we enable designs to become safer, smaller, and be
more reliable. "
The Pulsiv OSMIUM reference design demonstrates a significant
improvement in thermal performance and reduces critical
component temperatures by more than 30% compared to
other designs. At full load, the Flyback transformer reaches an
impressive 33.9°C at 230VAC and 30.3°C at 265V above an
ambient temperature of 26.1°C. Likely setting a new benchmark,
it enables 65W fast charging in space constrained environments
and heat sensitive applications such as in-wall plug sockets that
incorporate USB-C connectivity.
Optimize efficiency and space with a half-active bridge
Pulsiv Osmium technology senses AC line voltage and frequency
22 Magnetics Business & Technology * March/April 2025
Pulsiv PSV-EBAD-65USB evaluation board
to adjust capacitor charging time, therefore the circuit draws
no line current at the AC zero voltage crossing. This enables a
simple half-active bridge implementation to increase efficiency,
especially at low line conditions. Mosfets in the lower half of the
AC to DC bridge are carefully controlled, in combination with
high-side diodes. The half-active bridge in this design strikes the
delicate balance between efficiency, cost, and complexity and
supports universal input with efficiency gains of 0.7% at full load
from a 115V AC supply.
Half-Active Bridge Control
Innovative magnetics reduce transformer size by 20%
The Osmium technology generates a HVDC output that varies
between the peak AC input and 150V to drive the QR Flyback
at maximum efficiency. The wider voltage range significantly
reduces primary side inductance to enable the use of an EQ20
transformer which was developed in partnership with magnetics
company Frenetic, based in Madrid.
" Our team of magnetics experts have demonstrated that Pulsiv
Osmium technology maximises efficiency and reduces the size of
the flyback transformer to a level we've not seen before, " notes
Chema Molina, CEO of Frenetic. " This significant development
will enable customers to improve performance, reduce size, and
lower the cost of their design and we're excited to be part of such
an innovative solution " . As a result, size is reduced 205 and efficiency
improved 50% compared to an RM8 core typically used
in other designs.
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Magnetics Business & Technology - March/April 2025

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