Products, Materials + Tools | Nov 18, 2013

ISSI Announces Single Stage High Power Factor AC/DC LED Controller for Retrofit LED Bulbs

Integrated Silicon Solution, Inc., a leader in advanced memory and analog IC solutions, today announced the IS31LT3932, a high performance universal AC input LED Controller for the solid-state lighting (SSL) market place. With a universal input voltage range from 85 to 265VAC, a Power Factor Correction greater than 0.97 and a typical output current accuracy of +/-3%, the IS31LT3932 is ideally suited for a wide range of offline LED retrofit lamp solutions including E26, GU10, PAR and T8. This true constant current LED controller can support LED lighting solutions of up to 30W with a minimal number of external components.

The IS31LT3932 utilizes a patent pending average current mode control scheme to maintain inductor current regulation regardless of variation of input and output voltage. The device implements a Pulse Frequency Modulation (PFM) technology without an optocoupler and secondary side control or loop compensation circuitry dramatically reducing the bill of material (BOM) and overall cost. The controller can be configured to operate in a Non-Isolated Buck or Buck Boost mode or Isolated Flyback mode. The device's unique architecture continuously monitors the output voltage and adjusts the operating frequency to maintain high LED current accuracy.

The IS31LT3932 has special input power line sensing and output voltage sensing circuits operating in primary feedback mode to deliver highly accurate current regulation to the LED load. The IS31LT3932 incorporates many features found in more complex controllers such as soft-start, Vcc under-voltage lockout with hysteresis, and protections against output over-voltage, output open and short circuit, primary side over-current and thermal shutdown with hysteresis. In addition, the versatile high voltage gate drive of the IS31LT3932 will support a wide range of low-cost power MOSFET devices.

"The IS31LT3932 expands our LED controller offering for the retrofit lamp market," remarked Ven Shan, ISSI VP of Analog products. "Lighting manufacturers will benefit from the versatility offered by a high power-factor, universal AC input and constant current output because one design will support multiple LED array load configurations. With design re-use, our customers can truly maximize their design efforts."

Price and Availability:
The IS31LT3932 is available in a space saving, RoHS compliant SOP-8 package and is priced at $0.69 in 1,000 piece quantities.

For more information on this and other HBLED products visit the ISSI Analog products website http://www.issi.com/US/product-analog-hbled-driver.shtml or download the IS31LT3932 Datasheet

ISSI HBLED Product Line:
ISSI's HBLED product line offers a broad variety of devices for most types of SSL, including MR-16, GU-10, PAR, Bulb, Street lamps, Emergency lighting, and etc. Devices operate from Battery voltage, low voltage AC or DC, as well as AC line input voltage.  The HBLED product line is geared towards simplifying the application circuit for ease of use, as well as expediting our customer's time to market.

About ISSI:
ISSI is a fabless semiconductor company that designs and markets high performance integrated circuits for the following key markets: (i) automotive, (ii) communications, (iii) industrial, medical, and military, and (iv) digital consumer. The company's primary products are high speed and low power SRAM and low and medium density DRAM. The company also designs and markets NOR flash products and high performance analog and mixed signal integrated circuits. ISSI is headquartered in Silicon Valley with worldwide offices in Taiwan, Japan, Singapore, China, Europe, Hong Kong, India, and Korea. Visit our web site at http://www.issi.com/.  

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