MILPITAS, Calif., Nov. 8, 2016 /PRNewswire/ -- Intersil
Corporation (NASDAQ: ISIL), a leading provider of innovative power
management and precision analog solutions, today announced it is
shipping the industry's first 6-phase bidirectional PWM controller
designed to perform buck and boost power conversions between 12V
and 48V automotive buses. A single automotive-grade ISL78226
delivers up to 3.75kW at greater than 95% conversion efficiency,
and is able to interleave in a modular master/slave architecture to
deliver higher power. This innovative design allows engineers to
support the rapid adoption of 48V hybrid powertrains that provide
improved emissions and better fuel economy for internal combustion
engine/electric mild hybrids. Watch a video on the ISL78226
solution.
By 2020, automotive 48V systems will help reduce CO2
emissions by up to 15%, improve fuel consumption, capture energy
typically lost while braking, and provide torque in the low RPM
range for start-stop mild hybrids. The 48V power net is needed to
manage the next generation of energy efficient electrical systems
that require more power than available with the existing 12V
subsystem. To reduce weight, many traditionally
mechanical/hydraulic systems such as power steering, roll
stabilization, heating, and air conditioning will be converted to
48V electrical drive. A new electric turbocharger will provide
on-demand horsepower and torque, enabling the use of smaller more
efficient combustion engines without sacrificing drivability. A
high power starter/generator will replace the 12V alternator,
reducing noise and vibration during engine starting while allowing
regenerative braking to recapture up to 4x more of the available
kinetic energy. The 12V bus and 12V lead-acid battery will handle
the lighter loads, including ignition, interior lighting,
navigation and audio systems.
Previously, 48V systems required a DSP with complicated firmware
and/or separate buck and boost controllers combined with power
stages and complex switching logic. One ISL78226 controller
eliminates the complexity associated with previous 48V designs. The
controller responds to changing load requirements by automatically
adding or dropping phases to maximize system efficiency. It can
also manage an abrupt change in power conversion direction. For
example, if the 48V starter/generator fails while the vehicle is
driving, the ISL78226 DC/DC controller seamlessly reverses power
conversion direction so the 12V battery will temporarily supply the
48V subsystems, such as power steering, allowing the vehicle to
safely pull over and stop.
The ISL78226 controller also integrates a digital PMBus™
interface for system control, telemetry and diagnostics that
support ISO 26262 functional safety requirements. The controller's
limp-home mode reduces power in the event of a serious fault or
failure, allowing the vehicle to be driven home or to a nearby
service station for repairs.
"The ISL78226's high integration and innovative features
simplify designing a robust 48V/12V power net solution for
automakers," said Philip Chesley,
senior vice president of Precision Products at Intersil. "Designers
don't have to be digital power experts or assemble multiple buck
and boost controllers and the other required circuitry to create a
48V mild hybrid design."
Key Features and Specifications of ISL78226
- 6-phase bidirectional synchronous 12-48V controller regulates
voltage and current
- Master/slave architecture supports up to four ICs in
parallel
- Average phase-to-phase current balancing, and average current
output with +/- 1.5% accuracy
- Cycle-by-cycle peak current limiting, negative current
limiting, and digitally programmable average current limit
- Analog/digital control of output voltage
- Selectable phase-dropping and diode emulation for light load
efficiency improvement
- Phase dropping enabled with companion ISL78420 FET driver
family featuring tri-level input
- Programmable automatic driver bootstrap capacitor refresh
pulses
- Supply and clock redundancy for functional safety
- Comprehensive protection with selectable hiccup or latch-off
fault responses, and digitally programmable warning and fault
thresholds
- Dual-output flyback controller and 200mA adjustable output
linear regulator
- AEC-Q100 Grade-1 qualified for operation from -40°C to
+125°C
Pricing and Availability
The ISL78226 6-phase 12-48V
bidirectional synchronous DC/DC controller is available now in a
10mm x 10mm, 64-lead TQFP package and is priced at $6.95 USD in 1k quantities. An ISL78226EVAL1Z
evaluation board is also available. For more information, please
visit: www.intersil.com/products/isl78226.
About Intersil
Intersil Corporation is a leading
provider of innovative power management and precision analog
solutions. The company's products form the building blocks of
increasingly intelligent, mobile and power hungry electronics,
enabling advances in power management to improve efficiency and
extend battery life. With a deep portfolio of intellectual property
and a rich history of design and process innovation, Intersil is
the trusted partner to leading companies in some of the world's
largest markets, including industrial and infrastructure, mobile
computing, automotive and aerospace. For more information about
Intersil, visit our website at www.intersil.com.
Intersil and the Intersil logo are trademarks or registered
trademarks of Intersil Corporation. All other brands, product names
and marks are or may be trademarks or registered trademarks used to
identify products or services of their respective owners.
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SOURCE Intersil Corporation