In recent years, LED indoor lighting technology has developed rapidly, and LED indoor lighting has become an overwhelming consumer electronics product with huge demand. More and more LED industry chain upstream, middle and downstream enterprises have joined the development, design and production of indoor LED lamps, which has formed a huge enterprise group. China's superb LED lighting design , manufacturing technology, and LED lighting products with excellent performance and price ratio make it a global and global LED lighting design and production base; China has the world's largest population, family, and in recent years The rapidly improving housing conditions make it the largest lighting market in the world.
LED light sources must be supplied with constant current for normal, healthy and long life. Therefore, providing a stable constant current power supply to the LED lamp bead is the key to the technical power of the LED drive power supply . The driving chip of the constant current power supply is the core technology of the LED driving power supply. LED lighting is an emerging technology. In the early days, because there was no dedicated LED lamp bead to drive the constant current power chip, only the switching power supply chip for switching power supply, charger, adapter, and the constant current circuit at the back end could be used. Reluctantly meet the needs of LED lighting fixtures that require constant current drive power. In recent years, integrated circuit manufacturers at home and abroad have paid attention to and researched constant-current source driver chips for LED lighting. At the same time, they have developed and produced constant-current source driver chips for LED lighting at the same time, and at the same time, LEDs with high integration and simple application circuits. Lighting-specific constant current source driver chips are introduced to the market.
Indoor lighting LED luminaires will be truly massive products. Since countries have a consensus on the technical indicators of LED lighting, there are requirements for compensation for power factors, and it is necessary to return a clean grid to the society. Therefore, indoor lighting LED lamps will use a simple application line with power factor compensation, primary side control (PSR) constant current source driver chip. Single-stage APFC+CC+PSR chips may become the first choice for indoor lighting fixtures.
There are many foreign chip manufacturers, but because of the profit, labor, logistics and other factors they need, their prices cannot fall to the price that Chinese LED manufacturers want. Only Chinese local chip companies can meet their requirements. The profit, labor, and logistics of local chip companies are lower than those of foreign companies. At present, the LED constant current source driver chip produced by the local chip design company is comparable in performance to international companies, and its price is very competitive, and it also has a certain price reduction space.
The fast and comprehensive application technology service of the local chip design company will be another magic weapon to win the market and service production. The integrated circuit design company's provision of complete application solutions for end users is a demand trend in the consumer electronics industry in the new era, and is also a shortcut to quickly promote new integrated circuit products. Therefore, it is very important and necessary to introduce a new generation of chips to LED luminaire manufacturers while providing a practical model (DEMO) that can be used in production solutions.
BP3309 is a single-stage high-precision primary-side feedback LED constant current control chip with source power factor correction. It is suitable for flyback isolation or buck-boost non-isolated LED constant current with 85VAC-265VAC full voltage range input. power supply. A typical application of the BP3309 is shown in Figure 1.
BP3309 integrates active power factor correction circuit, which can achieve higher power factor (PFC) 0.95) and lower total harmonic distortion (THD "20%", efficiency can be greater than 85%; constant current in mass production) The accuracy can be less than +/- 3%. Since the operation is in the critical continuous mode of the inductor current, the power MOS transistor is in a zero current turn-on state, the switching loss is reduced, and the utilization of the transformer is also high. BP3309 adopts a proprietary current sampling mechanism, which works in the primary side feedback mode. It can realize high-precision output constant current control without secondary feedback circuit, which greatly saves system cost and volume and improves system reliability. The chip uses a patented source driver technology and an internal fast charging circuit to achieve low primary side drive losses, and ultra-fast system power-up, LED start-up time is less than 300mS, and AC85V start-up time is only 116mS (Figure 2). The BP3309 uses patented line voltage and load compensation technology to achieve excellent line voltage regulation and load regulation. AC full voltage input, linear load regulation is less than 3%. The line voltage compensation factor can also be flexibly adjusted by external components. The BP3309 incorporates multiple protection features to enhance system reliability, including LED open circuit protection, LED short circuit protection, chip supply overvoltage and undervoltage protection, current sampling resistor open and short circuit protection, and cycle-by-cycle current limit. All protections have an automatic restart function.
(Article source: Gaogong LED)
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