Primary-side regulation to eliminate opto-coupler, quasi-resonant operation for low EMI, and 200kHz switching frequency combine to reduce component count and size of LED drivers
洛斯加托斯，加利福尼亚州– Jan. 10, 2011 - iWatt Inc., a developer of energy-efficient digital power supply control integrated circuits (ICs) used in leading-edge power supplies, today announced two primary-side-regulated, leading- and trailing-edge-dimmable, AC/DC Digital PWM Controllers targeting 100V/230VAC offline LED lighting applications. Designed for isolated or non-isolated LED drivers used in incandescent replacement lamps including both space-constrained (GU10, MR16) and larger (A, PAR) types, the iW3612 (3W to 25W) and low-power iW3602 (3W to 10W) incorporate features to ensure long life, power efficiency, reduced size and component costs, and flicker-free compatibility with existing wall dimmers worldwide. Both LED driver ICs are pin compatible with the previous-generation iW3610, but offer wider dimmer compatibility and introduce new hot-plug support, where the user can swap the LED engine without recycling the input power for the LED driver.
Worldwide conservation initiatives to replace existing incandescent bulbs with energy-efficient LEDs force those LEDs to address the installed base of dimmable-lighting switches. In iWatt’s LED driver ICs, intelligent digital algorithms automatically detect all types of dimmers or a lack thereof for seamless operation, including both leading-edge (TRIAC style) and trailing-edge dimmers. In the rare case of an unsupported dimmer, safe mode shuts it down. The devices allow smooth, flicker-free dimming from 1% to 100% with tight +5% LED current regulation which prevents flicker from noisy line voltage.
iWatt’s AC/DC power conversion ICs are unique in that they feature a digital feedback and control loop versus analog. This adaptive digital control technology – which is transparent to designers and requires no programming or GUI development – optimizes efficiency, simplifies printed circuit board (PCB) design, and eliminates components to reduce driver size and bill of materials (BOM). Precision primary-side-control technology eliminates the opto-coupler and secondary-side control circuit used in traditional isolated flyback designs. Built-in frequency jitter and quasi-resonant (or valley-mode) switching reduces EMI with over 6dB margin and over 85% efficiency, improving thermal management and reducing the EMI filter components necessary. Proprietary digital spread spectrum technology also makes for easy EMI design by automatically adjusting the device’s switching frequency in real-time response to varying line voltage.
高达200kHz的高开关频率使设计人员能够使用较小的电容器和变压器来优化空间。此外，设计人员可以使用较小的散热器，因为高效率（85％或更高）降低了热损失。
LEDs can operate for more than 50,000 hours, and some manufacturers even say 100,000. However, over time and at elevated operating temperatures, the opto-couplers and low-cost electrolytic capacitors in the driver circuitry become weak links in achieving long life. iWatt’s primary-side-control technology eliminates the opto-coupler, and coupled with low inrush current and low ripple current by design, lengthens the life of the LED driver assembly.
综合安全功能包括：LED开放式/短路保护，输入过电压保护和过温热关断。高温下的LED电流降额也可以保护LED。ICS使系统设计人员能够超过所有安全，EMI和监管标准，包括EN55015B，IEC61000-3-2和能源明星。
芯片以低成本的热增强的SO-8封装，具有暴露的垫，允许较低的模切连接到PCB热阻，以提高可靠性。可提供样品，IW3602价格为0.84美元，IW3612以1,000件数量为0.98美元。
产品信息可用于：
http://iwatt.com/wp-content/uploads/2013/04/iW3602_Product_Brief.pdf
http://iwatt.com/wp-content/uploads/2013/04/iW3612_Product_Brief.pdf
在演示:
iwatt.com/wp-content/uploads/2013/04/iwatt_led_driver_overview_1-24-11.pdf.
关于Iwatt Inc.
iWatt Inc. is a power control IC company that designs, develops, and markets semiconductor products for the communication and consumer market segments. The company's patented digital control expertise raises the bar in power supply price/performance metrics. iWatt is currently working with market leaders in the communications, flat panel display, and consumer electronics markets to develop high-density, high-value AC-DC, and DC-DC power supplies. iWatt is backed by VantagePoint Venture Partners and Sigma Partners, two leading CleanTech investors, and Horizon Ventures. The Company’s Silicon Valley headquarters is located in Los Gatos, CA with additional offices in Taipei, Taiwan; Seoul, Korea; Tokyo, Japan; Shenzhen, China; and Hong Kong. For more information, visit iwatt.com or call (408) 374-4200.
Media Contacts:
斯科特布朗
+1 (408) 385-1954
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Michelle Moody
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