Products, Materials + Tools | Oct 04, 2012

Allegro MicroSystems Announces New LED Lighting Driver IC Series

Allegro MicroSystems, Inc. announces the release of a new simple and efficient family of LED driver ICs that can be configured as buck or buck-boost voltage converters. The LC5220D/S LED series is offered by Allegro and manufactured and developed by Sanken Electric Co., Ltd. in Japan. This new series is targeted at the consumer market with end applications to include LED lighting fixtures and LED light bulbs.

Features and Benefits:
• Buck and buck-boost topology; selectable by peripheral circuit structure
• Built-in fixed reference voltage limiting constant current control; high precision regulator improves current precision and simplifies setting of current level
• Sleep function, with latch mode; input high, 3 V or more, on REF pin turns off IC output to LEDs
• Enable function; input low on REF pin toggles IC output to LEDs
• High input voltage; up to 250 V or 450 V, depending on product
• Built-in constant current control; PWM method, output current adjustable by the voltage input on the REF pin
• External adjustable PWM dimming control
• Protection features:
o Open protection (OPP) with latched shutdown; protects IC when a free-wheeling diode is open
o Undervoltage lockout (UVLO)
o Overcurrent protection (OCP) with latched shutdown; variable OCP threshold linked to REF pin voltage
o Thermal shutdown (TSD) with auto restart

These non-isolating devices operate off-line, having a high voltage capacity that allows direct connection to a wide range of supply voltages (from 25 to 400 V recommended). The LC5220 series uses PWM and constant current mode to drive LEDs with adjustable dimming. Each device incor­porates a power MOSFET and controller IC as well as built-in protection and energy-saving functions, reducing external parts required, and making the LC5220 ideal for use in small-size LED light bulbs.

Standard through hole or surface mount packages are available. The LC5220 series is an updated version of the LC5200 series, and integrates most of those functions, while broadening the selection of AC input voltages and offering better protection features, for fewer peripheral components.

For additional information please download the LC5220 seriesdatasheet or visit www.allegromicro.com

About Allegro MicroSystems, Inc.:

Allegro MicroSystems is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro's innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Further information about Allegro can be found at www.allegromicro.com.

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