Ultra-low-power Bluetooth-controlled cost-effective dimmable smart lighting solution

The Internet of Things is growing at a high speed. Intelligent lighting plays a pivotal role in smart home and building automation applications in its segmented fields, achieving energy saving, reducing electricity costs, and facilitating people's lives. To design a smart lighting solution with competitive advantages, considerations need to be made from various aspects such as LED driving, communication, and energy efficiency. ON Semiconductor provides a Bluetooth-based low-power intelligent lighting solution that integrates scalable power linear LED AC direct driver NCL30170, the industry's lowest power Bluetooth 5 system single chip (SoC) RSL10, and high-voltage linear regulator NCP786A, eliminating the need for Switching Power Supply (SMPS), analog dimming range from 5% to 100%, power factor (PF) up to 0.99, total harmonic distortion (THDi) at full load is only 11%, and standby power consumption is less than 200 mW, which helps For designers to implement ultra-low-power Bluetooth-controlled dimmable smart lighting solutions with high cost performance.

Ultra-low-power Bluetooth-controlled cost-effective dimmable smart lighting solution

How to drive smart dimming?

An obvious advantage of AC direct drive topology is that it eliminates the traditional switching power supply, reduces the bill of materials (BoM) cost, reduces board space, improves EMI performance, and makes LEDs have a longer service life.

ON Semiconductor's NCL30170 AC direct-drive LED driver integrates a high-voltage startup current source for fast start-up for smart lighting and phase-cut dimming applications. The controller manages multiple LED currents in series. The auto-commutation topology produces a smooth sine wave current, making the LED constant current accuracy up to ± 1% and THD below 10%, thereby ensuring that the LED brightness remains unchanged and providing a leading industry power factor (0.99) .

NCL30170 is also the first product on the market that can drive multiple external MOSFET switches to support the connection of multiple LED strings. The power can be extended from 5 W to 300 W. The total number of connected LED strings and external switches is limited only by the highest power level.

NCL30170 can realize analog dimming, the dimming range is from 5% to 100%, and it can maintain the voltage regulation throughout the dimming range, thereby ensuring that the brightness of the secondary LED remains unchanged even at low power. For phase-cut dimming using TRIAC, NCL30170 achieves good SCR compatibility.

In addition, NCL30170 also integrates input over-voltage protection, Rcs short-circuit protection, thermal shutdown and other protection features to ensure high reliability.

Control Smart Lighting via Bluetooth Low Energy

RSL10 is a Bluetooth 5 certified single-chip radio system that supports Bluetooth low energy and 2.4 GHz proprietary / custom protocols, with data rates up to 2 Mbps, and uses different packages to provide the industry's lowest Bluetooth power consumption for multi-domain IoT applications and deep sleep The mode consumes only 62.5 nW, and the peak receive power is only 7 mW. Its high energy efficiency has achieved the industry's highest EEMBC? ULPMark? Score, and supports a wide power supply voltage range from 1.1 V to 3.3 V. It uses 384 kB flash memory and a dual-core processor. (ARM Cortex-M3 processor, 32-bit Dual-Harvard DSP system), also supports CEVA Bluetooth stack. When there is no high-voltage power supply, the RSL10 connection interval is 50 ms, which provides fast response when interacting with the user. The peak current is 8 mA and the average current is only 42? A.

Buck regulator with adjustable output

NCP786A is a high-performance high-voltage linear regulator with an input voltage range of 55 V to 450 VDC and an output current of 10 mA. The output voltage can be set by a resistor divider from 1.27V to 15V, which is extremely suitable for high input voltages. application. Provide ultra-low quiescent current (typical value 10? A), ultra-high power supply rejection ratio (PSRR: 70 dB @ 60 Hz, 90 dB @ 100 kHz), self-power consumption does not exceed 25? A, power consumption is only 8 mW, greatly Lower than the commonly used switching power supply buck regulator.

RSL10 + NCP786A power consumption for dimming applications

At the input of 300 VDC, we measured that the average current of the RSL10 + NCP786A dimmer when it is not connected is 38 μA, the average current of the connection is 57 μA to 67 μA, and the power consumption is only 22 mW.

   Standby power consumption

The standby power consumption (NCL30170 + RSL10) measured at 230 V AC input is about 140 mW to 150 mW, of which NCL30170 consumes about 125 mW. The standby power consumption of the entire solution is less than 200 mW.

The Bluetooth low-power dimmable smart lighting solution uses an innovative AC direct drive topology, eliminating the need for traditional SMPS. It has many advantages such as cost, volume, service life, and reliability, and can flexibly expand the power range as needed. American Semiconductor ’s proprietary active constant power dimming control technology, with a dimming range from 5% to 100%, a power factor of 0.99, and a THDi of only 11% at full power, can maintain uniform lighting brightness even when dimming , Integrates the industry's lowest power Bluetooth 5 SoC RSL10, provides advanced wireless functions without affecting system size, provides ultra-high PSRR through high-voltage linear regulator NCP786A, improves wireless application performance, and achieves high performance and ultra-low power with high cost performance Bluetooth-controlled dimmable smart lighting solution.


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