OPA729W

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LED Lighting - COBs, Engines, Modules

OPA729W Application Field and Working PrincipleThe OPA729W is an electric chip designed to provide high power level driving capability and bright light source dimming. The lighting industry has predicted that in the next few years, the market will shift from conventional to LED light sources, and the need for ever-better control and power density will rise. The OPA729W will be at the in this wave and serve as a reliable control component for practically every LED light application. The OPA729W is specially designed to provide long-term reliable LED light component solution. In LED lighting applications, it can be used to provide light source power control, current and voltage adjustments, and advanced dimging capability. The chip also provides a built-in jitter mechanism for digital dimming control for frequent dimming needs and delivered a smooth dimming performance. Dependent on signal integration, it features with various dimming modes including pulse width modulation (PWM), signal addressing with frame inaccuracy and dimming downward. The OPA729W has built in Miller Clamp technology and strives to eliminate EMI issues in LED lighting applications.The OPA729W with its electronic jittering (EJ) algorithm can aid in meeting most flicker regulations. This chip has an integrated power supply that rejects external noise and provides an extremely stable power supply. With a high frequency sample-and-hold circuit and its multiple pulse width modulation techniques , the OPA729W supplies ultra-high performance in dimming accuracy.LED light engines and modules typically contain a control unit and driver circuitry which includes the OPA729W chip. The control unit of this LED combination is typically a pulse width modulation (PWM) light dimming controller. This controller can adjust the current or brightness level of a light engine by adjusting the duty cycle or pulse width of the PWM signal sent to the driver circuitry for the given dimming word. The OPA729W chip is connected to the controller, forming a bridge from the controller to the light engine and effectively controls the electrical energy that flows to the engine. The OPA729W will similarly adjust the PWM dimming duty cycle and allow more electrical energy to flow to the light engine when the controller sends a dimming word to designate a higher brightness level, and significantly attenuate the current when the controller sends a dimming word to adjust the brightness level to a lower level. The improved accuracy that this provides in controlling the current also has a greater effect in providing for a more consistent light output. Without the OPA729W chip, the LED light engine would not be able to take full advantage of the dimming capabilities provided by the PWM controller, because the driver circuitry would not be able to accurately regulate the electrical energy going to the engine. COB LED lighting is a cost-effective form of LED lighting that uses multiple LED chips, often hundreds or thousands, mounted on one board. The OPA729W is great for COB lighting applications due to its high level driving capability and advanced dimming capability. The OPA729W can effectively drive high clock frequencies and provide a great dimming range. The current can be adjusted with built-in jitter mechanism when the analog dimming range is too limited. The Miller Clamp can protect lights from voltage peaks and surges and additional filters are provided to block high-frequency noises from transmitting down the transmission line.In summary, the OPA729W is an ideal chip for a wide range of LED lighting applications such as COBs, Engines, and Modules. It provides higher power level for driving capability and outstanding performance in dimming accuracy. With Miller clamp technology, this chip also eliminates EMI issues and provides an extremely stable power supply.

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