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LED Drivers for Human-Centric Lighting

The use of standard overhead fluorescent lights that cause fatigue, eye strain and uncomfortable working environments is waning. Recognizing that discrepancies between natural light and artificial light can have a powerful effect on human productivity and moods and can even impact overall health, many lighting designers are looking for effective solutions for implementing Human-Centric Lighting (HCL) systems using LED technology. Selecting the right LED driver is a key factor when creating an effective Human-Centric Lighting product design.

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What Are the Benefits of Designing Human-Centric Lighting Systems?

The adoption of a more human-centric approach to the lighting in offices, factories, schools, hospitals, medical rehabilitation centers and other facilities can improve the productivity, health, emotional stability and overall comfort for individuals who spend a significant amount of time in these environments. Advancements in LED technologies allow designers to create dynamic lighting systems that match the human body’s natural circadian rhythm and boost the existing natural light within a space with carefully tuned artificial lights.

 

Designing lighting systems to minimize the discrepancies between natural and artificial light requires tools that provide a high level of control over several different aspects of light, including a high Color Rendering Index (CRI), Correlated Color Temperature (CCT) compensation and the ability to adjust the level of light at just the right time.

What Key Features Does a Human-Centric Lighting Solution Need to Offer?

  • Quality of light: Minimal ripple so the quality of light is not affected
  • Color mixing: Ability to mix different color-temperature LEDs to produce light that closely matches the individual’s mood and/or time of day
  • Dimmable: Ability to dim the intensity of the light according to the individual’s mood
  • Wireless connectivity: Ability to wirelessly change the color and intensity of the light

Featured Products

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HV96001

Secondary Micro-Interfaced LED Controller with Deep PWM and Analog Dimming

The HV96001 couples tightly to a secondary microcontroller (MCU) that is typically used for the protocol interface in LED lighting systems. It integrates key features for dimming control, power management and system protection. Its dimming features work with MCU-directed Pulse-Width Modulation (PWM) and analog dimming controls to achieve stable operation at 0.01% and lower. The boost controller stage minimizes the operating overhead to increase system efficiency while reducing inductor size. It also provides line frequency rejection with an input voltage range up to 60V. The PWM dimming uses a proprietary architecture to achieve stable dimming capability over an ultra-wide range (10,000:1+ at 400 Hz). Protection features include output overvoltage and undervoltage protection, overcurrent protection, load short circuit protection and stuck-at-zero detection of the DIM input signal.

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HV96001 LED Driver Evaluation Board

Part Number: ADM01030

 

To help you get started with your development, the Deep Dimming LED Evaluation Board  is fully assembled and tested to evaluate and demonstrate the features of the HV96001 LED driver. On the primary side of the board, a flyback converter is implemented as an active Power Factor Correction (PFC) controller in combination with a PIC® MCU to provide a PF of > 0.9 for full input range. Supporting both linear and PWM dimming capability, the system’s PWM delivers an exceptionally wide dimming range of < 0.01%. The boost stage provides a higher voltage for the LED string with near-zero ripple for a flicker-free LED current. The load switch is used for PWM dimming with an ultra-wide duty cycle.

Started with Our Intelligent LED Lighting System Reference Design

Discover how you can drive two different temperature-color LED strings and control the color selection via Bluetooth® communication. Our Bluetooth Low Energy (BLE) LED Reference Design combines an HV9961 buck LED driver with an 8-bit PIC16F15313 microcontroller (MCU) that communicates with an RN4871 BLE module via UART to create an intelligent LED lighting system solution. The RN4871 module includes a Bluetooth 4.2 baseband controller, on-board Bluetooth stack, digital and analog I/O and RF power amplifier into one solution.

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HV9961 BLE Enabled Lamp

Recommended Devices for This Reference Design

Product

Product Details

HV96001

The HV96001 tightly couples to the secondary microcontroller (MCU), which is typically present for protocol interface in LED lighting systems. It integrates key features for dimming control, power management and system protection. Its dimming features work with general MCU-directed Pulse-Width Modulation (PWM) and analog dimming controls to achieve stable operation to 0.01% and below.

HV9961 

The HV9961 is an average-current-mode control LED driver IC operating in a constant off-time mode. Because this control IC does not produce a peak-to-average error, it greatly improves accuracy, line and load regulation of the LED current without any need for loop compensation or high-side current sensing.

HV9861A

The HV9861A is a patented, average-mode, constant-current control LED driver IC operating in a constant off-time mode.

HV9910B

The HV9910B is an open-loop, current-mode buck LED driver IC. It can be programmed to operate in either a constant frequency or constant off-time mode. PWM dimming response is limited only by the rate of rise and fall of the inductor current, enabling very fast rise and fall times.

HV9805

With a maximum power rating of about 25W at 120 VAC and about 50W at 230 VAC, the HV9805 driver IC is targeted at general LED lighting products, such as LED lamps and LED lighting fixtures. A two-stage topology provides true constant-current drive for the LED load while drawing mains power with high power factor.

RN4871

The RN4871 is a small-form-factor Bluetooth Low Energy (BLE) module measuring just 9 × 11.5 × 2.1 mm. It delivers up to 2.5 times better throughput and more secure connections as compared to Bluetooth 4.1-based products.

PIC16F15313

The PIC16(L)F153XX  family of eXtreme Low Power (XLP) 8-bit MCUs features Intelligent Analog and Core Independent Peripherals (CIPs), as well as a number of communication options for a wide range of low-power applications.