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64 l New-Tech Magazine
Infineon multimode
flyback controller improves
performance and drives down
power consumption in mid- to
high-end LED lighting designs
Infineon Technologies AG (FSE: IFX
/ OTCQX: IFNNY) today launched a
multimode flyback controller IC for
LED applications. It can shorten
‘time-to-light’, lower component
counts and reduce operational
and standby power consumption.
Designed to meet the performance
and efficiency demands of mid-
range to high-end LED designs,
the IRS2982S provides a versatile
controller solution that can meet the
needs of a wide variety of interior,
outdoor, office and industrial lighting
schemes.
The IRS2982S incorporates a 600
V high-voltage start-up cell that
delivers a fast ‘time-to-light’ of
less than 0.5 s. At the same time,
it eliminates the need for external
components for voltage division.
Configurable Critical Conduction
Mode (CrCM) and Discontinuous
Current Mode (DCM) operation
ensure compatibility with a wide
range of application requirements.
They make the device suitable for
dimming LED converter designs
across the full current range. The
key application of the IRS2982S
is the isolated flyback with CV
(constant voltage) mode which
opens up design flexibility in other
topologies, such as non-isolated
flyback with CC/CV, buck, boost,
and SEPIC (single ended primary
inductor converter).
Designed
to
keep
power
consumption to a minimum, the
IRS2982S features a burst mode
capability that ensures ultra-
low standby power. The device
operates from a wide input voltage
range of 85 VAC to 305 VAC and
incorporates over-voltage and over-
current protection as standard. An
optimized single-stage PFC/flyback
design ensures a power factor of
higher than 0.9 and a low THD of
below 20 percent.
Intersil Ships Industry’s
First USB-C Buck-Boost
Battery Charger
Single-chip ISL9237 reduces BOM
costs up to 40%, extends battery life
for ultrabooks, tablets and power
banks
Milpitas, Calif., Feb. 17, 2015 –
Intersil Corporation (NASDAQ:
ISIL), a leading provider of
innovative power management
and precision analog solutions,
today introduced the industry’s
first buck-boost battery charger
that supports two-way power
delivery in ultrabooks, tablets and
power banks using the reversible
USB Type-C™ connector. The
single-chip ISL9237 Narrow VDC
(NVDC) battery charger replaces
competitive buck and boost two-
chip charger solutions, eliminating
a charger IC and inductor to reduce
customer bill of materials (BOM)
costs by up to 40%. The ISL9237
leverages Intersil’s patented R3™
modulation technology for acoustic
noise-free operation, excellent
light load efficiency and ultra-fast
transient response to extend battery
run-time.
The USB 3.1-compliant ISL9237
joins the emerging USB-C™
ecosystem as the first battery
charger capable of providing buck-
mode, buck-boost-mode, and
boost-mode for 1-to-3 cell Li-ion
batteries. It also supports USB On-
The-Go (OTG) with a 5Vout reverse
buck-mode, and reduces traditional
two-stage charging to a single-stage
buck-boost for improved efficiency.
The USB Type-C interface
connection enables delivery of data,
video and power up to 100W over a
single cable.
In charging mode, the ISL9237
takes input power from a wide
range of DC power sources —
AC/DC charger adapters, USB
power delivery (PD) ports and any
travel adapter — to charge battery
packs with up to 3-series cell Li-ion
batteries. The ISL9237 can also
operate connected to only a battery,
an adapter, or both. The ISL9237’s
system turbo-mode helps the battery
and charger adapter work together
to supply the system load when it
exceeds the adapter’s capability.
In turbo-mode, the ISL9237 quickly
turns on the battery BGATE FET to
deliver system power. In addition,
the ISL9237’s wide 5V to 20V input
voltage capability helps boost the
USB-C ecosystem to support new
power bank products. Watch a
video on the ISL9237 solution.
“Mobile computing customers have
come to rely on Intersil’s battery
charging and power management
innovations to create the world’s
most efficient devices,” said Andrew
Cowell, senior vice president of
Mobile Power Products at Intersil.
“The ISL9237 is the first USB-C
battery charger to market. It far
exceeds the limits of what was
previously possible to help our