iWatt's portfolio of AC/DC converters all take advantage of the patented PrimAccurate™ control technology. This technology uses proprietary digital algorithms that perform real-time waveform analysis to monitor the output voltage and current through an auxiliary winding on the main transformer instead of using direct feedback from the output voltage (isolated or non-isolated). Cycle-by-cycle analysis through iWatt's digital technology allows for tight load and line regulation to input and output changes and full protection without costly additional components such as power sense resistors. By operating with a digital control block, the PrimAccurate™ devices can also operate in multiple modes of operation without the need for complex analog circuitry. Some of the AC/DC converters made by iWatt use combinations of Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM), flattening out the efficiency curve, offering high efficiency across a broader load range than equivalent analog circuits. In circuits where this technology is not needed, such as solid state lighting, the the converters use quasi-resonant control to optimize efficiency for heavy loads. The fully digital control also allows for compensation to be done in the time domain instead of the frequency domain, removing the need for external compensation components, easing design and reducing time-to-market for developers.

iWatt's AC/DC converters designed specifically for the Solid State Lighting (SSL) market overcome one of the major issues in designing retrofit luminaires, dimming without potentially harmful flicker.By implementing Flickerless™ technology in each SSL driver, iWatt offers LED drivers that are compatible with the industry's broadest range of dimmers, while eliminating potentially harmful flicker.

iWatt's patented Flickerless™ technology utilizes a two-stage conversion approach, first detecting the type of dimmer, if any, is present. Once determined which dimmer type is used, then the input voltage is passed through a chopping circuit, which provides the correct impedance to match the dimming circuit and therefore helps to improve the Power Factor of the overall circuit. Besides this, the chopping circuit also provides a voltage without the line frequency component, allowing the AC/DC controller to provide the PWM dimming of the LED driver current based on the dimming percentage demanded by the input dimming circuit. The iWatt family of SSL drivers operate with dimming frequencies between 630Hz to 900Hz, with a dimming range of 1% to 100%. This completely removes the possibility of visible and non-visible flicker on the LED output.

iWatt's LED Backlighting products are power management devices for driving large arrays of LEDs in LCD panels for applications such as HDTVs or Public Information Displays. With large displays that are backlit by LEDs, the key area of concern is how to provide equal brightness across the full panel without wasting too much energy or having to bin LEDs into similar characteristics. Binning is expensive and with new Energy Star^® power consumption standards becoming more and more stringent, burning extra watts to improve brightness matching is no longer possible. BroadLED™ solves all these problems by providing channel-to-channel current matching of better than 2% and a digital algorithm to optimize efficiency without sacrificing current accuracy. iWatt's patented Adaptive Switch Mode technology, part of the BroadLED™ technology, reduces wasted power by 60%, while maintaining better than 2% channel-to-channel matching, enabling higher integration of drivers and the possibility of implement local dimming for large LCD displays in HDTVs. Adaptive Switch Mode works by establishing a constant current through each LED string and then the digital control algorithm calibrates the low dropout driver to account for the voltage applied to the highest voltage LED string, which may be beyond what that individual string requires. The current through the string is increased in order to utilize the applied voltage to its maximum and then the LDO driver is PWM modulated until the average current matches the original programmed current. This way, the extra voltage applied in not wasted in the driver, but actually conserved by PWM'ing each LED channel. This savings, on a channel by channel basis, adds up to an extremely large energy savings, thank to iWatt's patented technology.

iWatt leverages its proprietary PrimAccurate™ control circuit technology and integrates it with high power transistors in order to create a new range of technology called AccuSwitch™. The integration of the patented digital control circuit, offering high output accuracy and a reduced component count through proprietary primary-side feedback technology, with a high voltage transistor allows for an overall solution that saves valuable real estate in home and industrial electronics. The iW181x family is the first family of products offered by iWatt with AccuSwitch™ technology, with an 800V-rated power bipolar transistor, enabling off-line power supplies with average output power ratings of 5W from a single integrated circuit.