The SD486X series chip is a built-in high voltage MOSFET and current mode PWM+PFM controller for switching power supplies introduced by Hangzhou Silan Microelectronics. The series features low power consumption, low startup current and low EMI. The maximum efficiency is over 84%, and the startup voltage, output voltage and maximum power can be adjusted. At present, the power range that the chip can provide is: wide voltage range 5~18W, narrow voltage range 7~21W. Can be widely used in set-top boxes, DVD players, power adapters and other complete products.
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The series of chips have a peak current compensation circuit, which can provide maximum power balance for the chip. After the circuit is initialized, the stress of the transformer at the time of chip startup can be effectively reduced. According to the actual situation of the load, the switching frequency of the chip can be adjusted within the range of 24~67KHz. The light load mode and peak current control function can provide higher efficiency for the chip. In addition, the ADJ terminal of the chip has the maximum power limit adjustment function; the frequency jitter generated by the oscillation chip can reduce EMI; in the standby mode, the chip enters the doze mode, thereby effectively reducing the standby power consumption of the chip. At the same time, various abnormal state protection functions are integrated inside the chip. Including undervoltage lockout, overvoltage protection, overload protection, primary coil overcurrent protection, overtemperature protection and pulse leading edge blanking. After the chip is protected, the chip can be automatically restarted until the system is normal.
The SD486X series chip is based on the BCD process independently developed by Silan Microelectronics. It is packaged in DIP-8 and has built-in high-voltage power MOS series transistors. Therefore, the SD486X series products have high integration, small footprint and easy assembly. Outstanding features such as machine debugging. Compared with the application scheme using discrete control chips and power MOSFETs, not only the overall cost is reduced, but also the reliability of the chip is greatly improved.
SD486X is another new series launched by Silan Microelectronics in the field of low-power AC-DC after the successful launch of the SD484X series. Silan Microelectronics will continue to deepen its efforts in the field of green energy conservation and launch more green energy-saving high-voltage power management products with superior performance.
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