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To provide energy-efficient lighting for a variety of fields, ST (STMicroelectronics) offers a complete line of power supply solutions and related product portfolios, from low wattage to high wattage products, enabling power supply design engineers to According to the power consumption characteristics of the products, we will select suitable power supply product solutions to develop LED lighting related products that are inexpensive and energy efficient. Mr. Xiao Fuyuan, the technical marketing manager of ST (Italian Semiconductor), is the director of four major LED lighting fields. He is speaking on STMicroelectronics products and solutions: LED lighting issues. He uses the perspective of LED lighting related products to explain the various solutions for its power supply design. The topology of LED lighting can be roughly divided into four major blocks, including: (1) indoor lighting spotlighting (15W, less than 15 watts), which is generally non-isolated buck or boost. Flyback: PSR (return type: primary side adjustment technology) to design. (2) Indoor/outdoor lighting (15-100W), this type of lighting can be PassivePFC Flyback (passive power factor correction flyback), SingleStagePFC (single-stage flyback power factor correction) or ActivePFC Flyback (active power factor correction) Flyback). (3) Outdoor lighting / street lights (100 ~ 250W), can use ActivePFC Flyback, ActivePFC QRFlyback (quasi-resonant flyback) or PFC LLCResonant (power factor correction LLC resonance). (4) Special lighting, such as automotive lighting (AEC-Q100 specification). As for general LED lighting applications, it can be divided into six categories, including: home, commercial, outdoor, street lights, large blocks, emergency lighting. The most important factors driving the LED lighting application market are mainly these three items: (1) efficiency, that is, paying attention to PFC (power factor correction) is high, for example, ENERGY STAR has standardized high-power products of more than 5 watts. The power factor of indoor and commercial lighting must be greater than 0.7 and 0.9. (2) Reliability, that is, MTBF (mean time between failures) is low. For example, circuit design without e-cap (electrolytic capacitor) can be reduced. Sensitivity to temperature to increase stability. (3) Small size, that is, in the alternative of innovative lighting bulbs, including 3 to 20W, the circuit must be able to be inserted into a small space, and has TriacDimmable (leading edge control dimming) Features to increase overall stability. If the lighting application is distinguished by the wattage of the power supply, it can be divided into: Retrofit (such as a bulb), Linear (such as a fluorescent), Panel (such as a flat panel), Street (street), and the like. The wattage is three types of low, medium and high wattages such as 3 to 15W, 15 to 75W, and 100W. The power supply architecture and requirements of various wattages are also different. For example: (1) Low wattage (15W) must have high power factor, power supply and lamp body to adopt a single package, 矽 control dimming, small size and other characteristics, LED current is 10mA ~ 1A, single string design. (2) Medium wattage (15~75W) has high power factor, separate design of power board and control board, post-regulation and dimming, low cost, etc. LED current is 100mA～1A, single or multi-string design . (3) High wattage (75W) also has high power factor, power supply separation design, innovative digital dimming method, remote control, wide temperature design (-40C), ZVS (zero voltage conversion) and other characteristics, LED current Single or multi-string design at 100 mA to 1 A. There are many kinds of schemes and superb advantages. The lighting products with various lighting requirements are generally 15W or less. In terms of circuit architecture, 5W and below are generally matched with a set of QRFlyback converters, while 5W to 15W are generally high-powered. In addition to the QRFlyback converter, there is also a high-performance Flyback converter design with front Triac dimming. The benefits of QRFlyback are that it can reduce the energy loss of switching, improve energy efficiency by more than 80, and is higher than the traditional Hardswitching (hard switch) design of 75, so it is suitable for power supply design of LED lights. A standard power supply that is typically connected to AC (alternating current). When applied to LEDs that require DC power, we can change the architecture by changing the VoltagereferenceIC (reference voltage IC) to a CC/CV controller. Even components such as ICs and MOSFETs (metal oxide field effect transistors) can be omitted, and components such as photocouplers and reference voltage ICs can be omitted by integrating PSR. Because different wattage lighting products have different power supply design requirements, ST has launched various related solutions for different product applications. In the general lighting (15W) product section, there are 5W HVLED805, 7W HVLED807PF and 15W HVLED815PF. High integration, low part count, high power factor and low THD (total harmonic distortion). Dimmable voltage regulator design is high quality and can't be replaced. Triac dimming solution, such as STEVAL-ILL044V1 adopts independent design, adopts American standard (90~132V) dimmable design, output power is 9W, 175mA, energy efficiency 86, high power due to 0.98, THD value of 20 and other characteristics. Because of the dimming products, most of them are divided into American and European voltage products. ST is also developing European regulations (up to 230V) with Triac's solution, and may even develop Universal (full voltage, 90-230V) in the future. Products to meet the needs of a variety of customers. Xiao Fuyuan said that with the traditional 9WTriac dimmable circuit design, when a light is turned on, its LineVoltage will suddenly increase and then slow down to stability, while LineCurrent will not fix the current because of Triac. The so-called Ringing waveform is generated, causing Flicker to appear when the bulb is just lit. The HVLED815PF LED controller, its InputEMIfilter (input filter) has been added to the Damping circuit (damping circuit), through the addition of RC and other components, the lamp can maintain a stable line shape, reduce the Ringing when the lamp is just energized, and let the bulb When it is turned on, there is no flicker. How does the HVLED815PF achieve a high power factor, which increases the conversion efficiency at low voltage through the Diode (diode), and compares it through an internal IC controller by adding an AC component to the rectifier during dimming. McDonald's wave, let its power performance better. As for the 15W Triac dimming solution, the STEVAL-ILL045V1 is a non-isolated design that removes the clampcircuit design, allowing the secondary winding to be part of the primary winding and overshooting the FET's drain voltage. ) Less, so it can improve its motivation. The medium and high wattage schemes do not need to lie in the 15W ~ 75W medium wattage solution part, with a single string LED design part, mostly with a set of high-power Flyback converters with CC / CV controller to implement. Multiple strings of LEDs are added to the above converter, followed by MonolithicBuckConverter (single-chip buck converter), and multiple InverseBuckConverter (inverted buck converter), and then with analog program AnalogController (or analog controller) or with Digital solution MCU (microcontroller) to achieve power control of multiple strings of LEDs. In the circuit diagram architecture part, in the single-string design, the PFC controller part adopts STL6562A/AT, L6564 (T/H), etc. to do the PFC control of the parallel mode, and the MOSFET part adopts STSuperMESH5PowerMOSFET (800V~950V), Unique static and dynamic efficiency. In the CC/CV controller section, TMC101 (CC/CV control) and SEA05, SEA01 (with digital dimming function) and other CCC controllers are used. It is worth noting that digital dimming writes the adjusted data to the internal memory in advance through the preset (default parameter), which has the advantage of saving labor costs in mass production. As for the design of multiple strings of LEDs and analog circuits, after AC-DC conversion, two sets of DC-DCBuckLED driver ICs (such as STLED5000, LED2001, and LED2000 components) are used together with Schottky diodes. The group DC-DCInverseBuckLED driver IC is implemented. Since the Standard buck converter is floating, it must have a charge pump circuit. With an Inverse buck converter, the power MOSFET's drain is grounded and easy to control. Let's look at high wattage applications. For the high-end products with 75W and PLM (PowerLineModule; power line module) for remote control, the architecture is to use the high-performance Flyback at the leading edge, and then connect two sets of InverseBuck (independent string design), and then connect the STEVAL-ILL043V1 to the PLM. The remote control module allows it to remotely control the opening and closing of its LED lights using the power line. In the multi-string (analog or digital drive) circuit design part of building outdoor lighting (75W), with ST's various products, power efficiency can be achieved. 93. Overall average efficiency 87. In the 75W digital LED power supply design part, adopt it EVALSTLUX385 features 4-channel LED and dimming, and features remote control via DALI, USART and other transmission interfaces. The STLUX385A lighting and power management digital controller has won the CES2014 Innovation Award and is the world's first digital controller to solve all application needs with programmable chips. Its specifications support 12 ~ 50V, 4 sets of independently configurable LED channels, each channel can support 3 ~ 10 LED lights, and has open circuit and short circuit protection design. Suitable for a variety of application needs such as professional lighting, street lighting, lighting mixing and color matching. Overall, ST offers total solutions for general LED lighting applications such as wattage, architecture, and dimming, including analog or digital circuits, and offers a variety of design tools (such as evaluation boards), development kits, design worksheets, and Application notes can make LED lighting power supply design easier, easier and more efficient.