Non-isolated driver (non-isolaTIon) chips have always played an important role in LED lighting applications. Compared with isolated products, it has higher efficiency in architecture and lower system cost, and has a small footprint. Gradually become a mainstream program. Silan Microelectronics has introduced a series of driver chip SD690XS series for high performance non-isolated LED lighting driver applications. This series of chips belongs to the drive circuit of the built-in high-voltage MOS tube. It can be called a true constant current source. It can detect and control the real output current in real time, and output current changes when the input voltage, output voltage, and peripheral inductance change. Very small. The SD690XS uses a number of patented technologies with excellent performance, high PFC, high constant current accuracy and high conversion efficiency. It can be widely used in various LED lighting applications such as bulbs and T5/T8 LED lamps. The SD690XS has the following advantages: 1: Built-in 600V high-voltage power MOSFET, SD6901S, SD6902S and SD6904S respectively have different current levels of MOS to meet the needs of different power segments. Among them, SD6904S has 4A current capability MOS, adopts SOP7 miniaturized package, which is the only one in the industry. Built-in MOS circuit (small package) with voltages up to 18W. 2: With very good current consistency, using the patented technology of the constant current control mode of Silan Micro, the output current is directly collected, and the current is controlled by the error amplifier. The consistency of the constant current accuracy can be within ±3%. 3: The chip can work over a wide voltage range. The SD690XS uses a unique constant current control mode. The input voltage can vary from 85V to 265V, and the output current varies by less than ±1%. 4: Using floating technology, it can be used for non-auxiliary winding power supply technology, which can effectively reduce costs. In addition to the above advantages, the SD690XS also comes with a PFC control function that automatically achieves a full PF value in the full voltage range (full voltage input range PF 0.9). At the same time, the chip adopts the bottom-open mode, which can reduce the switching loss and improve the system conversion efficiency. In 18W applications, the conversion efficiency is higher than 93%. In addition, the chip integrates various protection functions, including output open circuit protection, output short circuit protection, cycle-by-cycle overcurrent protection, over temperature protection and VCC overvoltage protection. Among them, the LED short-circuit protection also uses the patented technology of Silan Microelectronics, which can make the chip achieve extremely low output short-circuit protection power consumption under abnormal conditions of output short circuit (short-circuit power consumption at 18W) Managed POE Industrial Switches The POE switch port supports an output power of 15.4W or 30W, in line with the IEEE802.3af/802.3at standard, and supplies power to standard POE terminal equipment through network cable power supply, eliminating the need for additional power wiring. In line with IEEE802.3at POE switch, the port output power can reach 30W, and the power available to the powered device is 25.4W. In layman's terms, a POE switch is a switch that supports network cable power supply. It can not only realize the data transmission function of ordinary switches, but also at the same time. Supply power to the network terminal.
POE (Power Over Ethernet) refers to the use of IP-based terminals (such as IP phones, wireless LAN access points AP, network cameras) without any changes to the existing Ethernet Cat.5 cabling infrastructure. Etc.) While transmitting data signals, it can also provide DC power supply technology for such devices. POE technology can ensure the normal operation of the existing network while ensuring the safety of the existing structured cabling, minimizing costs.
POE is also known as a local area network-based power supply system (POL, Power over LAN) or Active Ethernet (Active Ethernet), sometimes also referred to as Power over Ethernet for short. This is the use of existing standard Ethernet transmission cables to transmit data and data at the same time. The latest standard specification of electric power, and maintains compatibility with existing Ethernet systems and users. The IEEE 802.3af standard is a new standard based on the POE of the Ethernet power supply system. It adds related standards for direct power supply through the network cable on the basis of IEEE 802.3. It is an extension of the existing Ethernet standard and the first international standard for power distribution. standard.
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