NCP3066DR2G Integrated Circuits (ICs)

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Introduction to LED Drivers

LED drivers are electrical circuits designed to regulate and control the flow of current within an LED system. LED drivers are used to control the electrical properties of LED lighting systems, such as brightness, power consumption, thermal management, and EMI compliance. An LED driver is composed of integrated circuits, transistors, or other semiconductor devices.

NCP3066DR2G Application Field and Working Principle

The NCP3066DR2G is an easy-to-use, highly-integrated step-down DC/DC converter designed for battery-powered applications that require adjustable switching frequency from 250kHz to 2MHz with two external resistors. Its high integration can simplify the external components count and reduce the PCB size for handheld device applications.

The PI solution of NCP3066DR2G primarily targets lighting applications. It has synchronization for LED current. The PI solution provides fast adjustment and tuning under varying load conditions and is suitable for LED strings with highest current mirror accuracy. It contains an advanced, low-cost current sensing element feature, and is highly flexible with two control modes, selectable via an external resistor. With fast switching frequency of up to 2MHz, the PI solution provides ultra-fast, accurate current mirroring, thus providing designers with the flexibility to select the appropriate brightness control result and EMI-optimized solution.

The working principle of NCP3066DR2G is based on step-down DC/DC converter. It is a non-isolated buck converter, and the regular buck topology can regulate an output voltage by varying the duty cycle of the internal switch. The output voltage of the buck converter is given by the formula Vout = VIN (1–D), where D is the Pulse Width Modulation (PWM) duty cycle controlled by the internal PWM comparator.

The internal Analog-To-Digital Converter (ADC) reads the feedback voltage from the output side and compares it to the reference voltage set by an internal bandgap voltage generator. The internal control loop corrects the duty cycle in order to maintain a regulated output voltage. An internal oscillator generates a triangular waveform with a frequency adjustable between 250kHz to 2MHz by two optically tied resistors.

NCP3066DR2G series are great for current-mode control (CMC) operations, providing power efficient and fast transient response. The CMC solution includes an integrated low-power NPN high-side driver, which enables simple and fast current sensing techniques, such as an external resistor or current-sensing element, while providing softer switching.

NCP3066DR2G supports high peak current output (up to 30A) with very low input voltage drop (< 0.3V). Its switching frequency is adjustable from 250kHz to 2MHz which can provide fast response to changing load current. Its LM5084M device has current-mode control while delivering low quiescent current and typical power of 800mW. It also provides fast transient response times, excellent load and line regulation, reliable current limit and soft-start. The LM5084M is a low-power step-down DC/DC converter ideal for space-constrained applications.

Conclusion

The NCP3066DR2G step-down DC/DC converter is a highly-integrated solution that is ideal to be used in LED systems. It is capable of regulating the electrical properties of LED lighting systems including brightness, power consumption, thermal management, EMI compliance and much more. It is a current-mode control (CMC) device that can support a high peak current output and fast switching frequency, providing fast transient response and excellent load and line regulation. In conclusion, the NCP3066DR2G device is an ideal choice for LED systems.

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