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LED Drivers for Human Centric Lighting


Gone are the days of standard overhead fluorescent lights that result in fatigue, eye strain and uncomfortable working environments. Human Centric Lighting is the understanding that there are often discrepancies between natural light and artificial light which can result in a powerful effect on our productivity, mood and can even impact our overall health.

Selecting the right LED driver is a key component to creating an effective Human Centric Lighting product design.

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Smart Lighting Demo Solution – HV9961 with Bluetooth® Control
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Microchip has developed a reference design that demonstrates how customers can drive two different temperature color LED strings and how to control the desired color through Bluetooth® communication. This solution combines a buck LED driver (HV9961) with an 8-bit microcontroller (PIC16F15313) which communicates through UART with the Bluetooth module (RN4871) to create an intelligent LED lighting system solution. This demo combines a Bluetooth low energy module which 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
Benefits of Designing Human Centric Lighting Systems
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Businesses, schools, hospitals and medical rehabilitation centers can benefit by adopting a more human-centric approach to the lighting in offices and factories to improve productivity, health, emotional stability and overall comfort.

Advancements in LED technologies allow designers to create dynamic lighting systems that match our bodies natural circadian rhythm and boost the existing natural light within a space with carefully tuned artificial lights. Designing lighting systems that are geared toward minimizing the discrepancies between natural and artificial light require engineers to have tools that provide a high level of control over several different aspects of light.

Systems that aim to improve the quality of light require high Color Rendering Index (CRI), Correlated Color Temperature (CCT) compensation and the ability to adjust level of light at just the right time.

Characteristics and Requirements
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In order to achieve Human Centric Lighting, the solution needs certain key features:
  • Quality of light: Minimal ripple such that it does not impact the quality of light.
  • Color mixing: Ability to mix different color temperature LEDs to produce light that closely matches the person’s mood and/or time of day.
  • Dimmable: Capabilities to dim the intensity of the light according to the mood.
  • Wireless connectivity: Ability to be able to change the color and intensity of the light through wireless control.
ProductProduct Details
HV9961The HV9961 is an average current mode control LED driver IC operating in a constant off-time mode. This control IC does not produce a peak-to-average error, and therefore greatly improves accuracy, line and load regulation of the LED current without any need for loop compensation or high-side current sensing.
HV9861AThe HV9861A is a patented, average-mode, constant current control LED driver IC operating in a constant off-time mode. 
HV9910BThe HV9910B is an open loop, current mode, buck LED driver IC. The HV9910B 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.
HV9805HV9805 driver IC is targeted at general LED lighting products, such as LED lamps and LED lighting fixtures with a maximum power rating of about 25W at 120 VAC and about 50W at 230 VAC. A two-stage topology provides true constant current drive for the LED load while drawing mains power with high power factor. 
RN4871The RN4871 is a small form factor, Bluetooth low energy module measuring just 9 x 11.5 x 2.1 mm. It delivers up to 2.5x throughput improvement and more secure connections compared to Bluetooth 4.1 based products.
PIC16F15313PIC16(L)F153XX 8-bit microcontroller family features essential peripherals like Intelligent Analog, Core Independent Peripherals (CIPs) and communication combined with eXtreme Low-Power (XLP) for a wide range of low-power applications.