Specifications

17
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APPLICATION SPOTLIGHT
Digital-power controllers unlock performance, flexibility
and energy-efficiency gains
ExarReleasesIndustry’sHighestIntensitySupercapacitorLEDFlash
Driver
Microchip’s dsPIC33F GS family of digital
signal controllers is optimised for high-
performance digital-power control, and
enable part-count reduction as well as
greater performance, flexibility and
energy efficiency in applications such as
power supplies, renewable-energy systems
and advanced lighting.
The controllers can be configured for a variety
of buck- or boost-converter topologies, giving
The XRP6840 -- up to 4.3Amps -- Extends
the Reach of LED-Based Flash Solutions into
Leading-Edge Consumer Applications
Exar unveiled the XRP6840, the industry’s
highest intensity LED flash driver with full
management of supercapacitor based flash
technology. The XRP6840 delivers up to 4.3Amps
flash pulse which is ideal for high resolution
mobile phone cameras and standalone digital
cameras.
Increased resolution in camera phones
and standalone digital cameras requires a
high intensity LED flash current beyond the
capabilities of standard lithium-ion batteries.
The XRP6840 alleviates such peak current
requirements by constantly sourcing a low
controlled current from the system’s battery
FEATURES:
 16-bit 40MIPS CPU
 Up to three 16/32-bit timers
 Internal high-precision oscillator
 UART, SPI and I2C ports
APPLICATIONS:
 LED-lighting controllers
 DigitalHIDanduorescentlampballasts
 Uninterruptible power supplies
 AC/DC power conversion
 DC/DC converters
 Intelligent battery chargers
Microchip
Exar
designers the freedom to optimise for specific
product applications. A single dsPIC33F GS
device can support an entire
system implementation
for LED lighting products,
including power conversion
and PFC alongside digital-
ballast functions such as
dimming and colour-hue
control.
With 32kbyte to 64kbyte
of on-chip Flash, family
members have significantly
larger memory capacity
than previous generations of
digital-power controllers. This
enhances support for 100%
digitally-controlled lighting offering advanced
features and the ability to customise and
differentiate by modifying software.
Intelligent power peripherals minimise
demands for processor intervention and
support the ability to handle the real-time
needs of high-speed current-mode control.
These include up to 18 topology-flexible PWM
channels, up to four high-speed comparators
with programmable references, and up to two
to charge a supercapacitor which in turn
provides the power for peak load functions.
Charging and discharging parameters of the
supercapacitor are completely managed by
the XRP6840 and fully programmable via an
industry standard I2C interface. The XRP6840
supports high peak current functions in battery
operated portable systems while significantly
increasing battery life.
Key Product Features
The XRP6840 combines and manages in a
single device all the functions necessary to
implement a supercapacitor based LED flash
driver solution. Supporting programmable
current in torch and flash modes, the device
comes in both two and three channel versions
for increased design flexibility and supports up
to 600mA of constant charging current. Built
around tri-mode charge pump architecture
and operating at 2.4MHz, the XRP6840 provides
inrush current control and device protection
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10-bit ADCs having 4Msample/s capability
for low latency and high-resolution control.
circuitry while a standard I2C interface provides
a seamless integration into any system.
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EMAIL
ftm.asia
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futureelectronics.com
Reader Response No.
25