Dialog Semiconductor's New SSL LED Driver Platform Delivers the Ultimate in Dimming Performance at Optimised BOM Cost

iW3688 uses digital control for highest performance phase-cut dimming and superior TRIAC/digital dimmer compatibility; eliminates over 20 external components including external bleeder circuit

LONDON--()--Dialog Semiconductor plc (FWB:DLG), a provider of highly integrated power management, AC/DC power conversion, solid state lighting (SSL) and Bluetooth(R) Smart technology, today debuted its innovative solid state lighting (SSL) LED driver platform designed to deliver the ultimate in dimmer performance and compatibility with an ultra-low bill of materials (BOM) cost for next-generation LED bulbs. The first LED driver from this new platform - the iW3688 - delivers smooth, flicker and shimmer-free dimming supporting the widest range of phase-cut dimmers. It also enables manufacturers to drive down the manufacturing cost of LED bulbs by using Dialog's patented integrated digital control technology to eliminate more than 20 components, including the external bleeder circuit.

“Dialog invented digital adaptive control LED driver ICs to optimise SSL luminaire performance and to drive the cost of LED lighting down to an affordable price point for mass consumer adoption”

The iW3688 single-stage LED driver is designed for applications up to 20W, including A-style, BR, candle, GU10 and PAR bulbs and T8 LED tubes, as well as external lighting ballast drivers. It uses Dialog's patented intelligent digital dimming control technology to provide exceptional compatibility and performance with the most challenging TRIAC and digital dimmers, while Dialog's patented sophisticated digital algorithms enable integrated active biasing for high performance dimming at a lower cost compared to conventional external bleeder circuits.

"Dialog invented digital adaptive control LED driver ICs to optimise SSL luminaire performance and to drive the cost of LED lighting down to an affordable price point for mass consumer adoption" explains Davin Lee, Senior Vice President and General Manager of the Power Conversion Business Group at Dialog Semiconductor. "Our innovative iW3688 LED driver platform once again raises the bar and extends our lead in wide dimmer compatibility, exceptional dimming performance and ultra-low BOM cost - sophistication and performance that can only be achieved with digital control."

TRIAC dimmers require a minimum load current to maintain forward conduction. This is a problem for highly efficient, low-power LED bulbs since they may fail to draw enough current through the TRIAC to clear the holding current threshold, resulting in flicker and shimmer in dimmable LED bulbs. Many low-power bulb designs address this issue by using an external bleeder circuit to draw extra current through the TRIAC while it is conducting. However, the disadvantage is these bleeder circuits require additional external components and dissipate additional power inside the bulb, significantly raising the internal temperature and shortening the LED bulb operating lifetime.

The iW3688 eliminates the cost of up to 20 external components in the bulb design, including as many as 10 required for the external bleeder circuit, and instead uses Dialog's integrated digital algorithms that modulate primary FET switching to draw extra current during dimming. This ensures the input current continuously stays above TRIAC biasing thresholds during forward conduction, eliminating the need for an external bleeder circuit. The iW3688 further reduces BOM costs by simplifying the EMI filter circuit and integrating the current sink, switching and VCC charging circuits. Additional savings come from the iW3688's advanced IC power management and voltage sensing, which allow the use of low-cost, off-the-shelf inductors.

The iW3688 integrates Dialog's patented over-temperature protection (OTP) de-rating technology to address LED bulb lifetime issues caused by excessive heat. OTP technology monitors the temperature inside the sealed SSL bulb and seamlessly dims light output if the temperature rises above a safe operating threshold, then restores brightness as temperature falls. This results in cooler operation, avoids exceeding the temperature rating of the electrolytic capacitors, and helps ensure a predictable and safer bulb operating life.

iW3688 Key Features

- Single-stage with up to 20W output power

- Digital algorithms provide exceptional dimmer compatibility - TRIAC and digital

- Highest performance phase-cut dimming

- Immune to noise and instability - no shimmering

- Automatic detection of dimmer type

- Wide dimming range 1% to 100%

- Configurable dimming parameters

- Lowest total BOM size/cost

- Integrated current sink, switching and VCC charging circuit

- Uses low-cost, off-the-shelf inductor

- No added cost for potting

- Low total harmonic distortion < 20% with high PF > 0.95

- Built-in LED over-temperature protection derating

The iW3688 is available today in an SOIC14 package, and expected to be in volume production in the second Quarter of 2015.

Product summary is available: iW3688

Product Summary. Dialog iW3688 LED driver video: http://www.dialog-semiconductor.com/media-centre/multimedia-library.

‒ ENDS ‒

About Dialog Semiconductor

Dialog Semiconductor provides highly integrated standard (ASSP) and custom (ASIC) mixed-signal integrated circuits (ICs), optimised for Smartphone, Tablet, IoT, LED Solid State Lighting (SSL) and Smart Home applications. Dialog brings decades of experience to the rapid development of ICs while providing flexible and dynamic support, world-class innovation and the assurance of dealing with an established business partner. With world-class manufacturing partners, Dialog operates a fabless business model and is a socially responsible employer pursuing many programs to benefit the employees, community, other stakeholders and the environment we operate in.

Dialog's power saving technologies including DC-DC configurable system power management deliver high efficiency and enhance the consumer's user experience by extending battery lifetime and enabling faster charging of their portable devices. Its technology portfolio also includes audio, Bluetooth(R) Smart, Rapid Charge(TM) AC/DC power conversion and multi-touch.

Dialog Semiconductor plc is headquartered in London with a global sales, R&D and marketing organisation. In 2014, it had approximately $1.16 billion in revenue and was one of the fastest growing European public semiconductor companies. It currently has approximately 1,400 employees worldwide. The company is listed on the Frankfurt (FWB: DLG) stock exchange (Regulated Market, Prime Standard, ISIN GB0059822006) and is a member of the German TecDax index. It also has convertible bonds listed on the Euro MTF Market on the Luxemburg Stock Exchange (ISIN XS0757015606).

Language:   English
Company: Dialog Semiconductor Plc.
Tower Bridge House, St. Katharine's Way
E1W 1AA London
United Kingdom
Phone: +49 7021 805-412
Fax: +49 7021 805-200
E-mail:

jose.cano@diasemi.com

Internet:

www.diasemi.com

ISIN: GB0059822006, XS0757015606
WKN: 927200
Indices: TecDAX Listed: Regulierter Markt in Frankfurt (Prime Standard); Freiverkehr in Berlin, Düsseldorf, Hamburg, München, Stuttgart

Contacts

Dialog Semiconductor
Lauren Ofstedahl
Phone: +1 (408) 845-8518
lauren.ofstedahl@diasemi.com
Web: www.dialog-semiconductor.com
Twitter: @DialogSemi
or
Dialog Semiconductor Power Conversion Business Group
Sherry Hill
Phone: +1 (408) 628-6521
sherry.hill@diasemi.com

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