Shulou(Shulou.com)11/24 Report--

CTOnews.com, December 6, with the popularity of 100-watt high-power adapters, high switching frequency, high power density and high efficiency require a better flyback architecture. For high-power chargers and adapters whose power is more than 75W, power factor correction (PFC) is usually needed, which also drives the market demand of corresponding PFC controllers, inductors, rectifier filters and other devices.

SMIC announced the launch of a new generation of PFC control chip-SC3201, which can meet the power factor and input current harmonic requirements of medium and high-power chargers and adapters. With no auxiliary winding, integrated THD optimization, support for segmented output and other core technologies. SMIC SC3201 is packaged in SOT23-6, and VDD supports 9-30V MagneSC3201 not only supports VFB overvoltage protection, VDD undervoltage protection, periodic current limit protection, ultra-high temperature protection and other multiple protection measures, but also supports second-level independent overvoltage, undervoltage and overcurrent protection. CTOnews.com learned that the chip can be widely used in USB-PD chargers, AC-DC adapters, LED drivers, industrial power supplies, power tools and other fields.

SMIC SC3201 PFC controller can be matched with high frequency QR controller SC30xx series and synchronous rectifier controller SC35xx series to form a complete 80W-160W solution.

SMIC 100W solution demo demonstration takes 100W adapter design as an example, using the whole SC3201+SC3057+SC3503 scheme, high PF value and high efficiency can be obtained in the full input range. The full load efficiency of the whole machine can reach 94.3%, and the lowest input voltage of 90Vac can still reach the efficiency value of 92.3%. In the full voltage range, the PF value is above 0.9.

Efficiency curve

PF value curve SMIC Technology layout PD fast charging complete solution, from the launch of the first PD protocol chip, NSC Technology aims at the USB-PD adapter market, before and after the introduction of secondary feedback (SSR) controller for a wide output voltage range, ultra-fast turn-off secondary synchronous rectifier (SR) controller and integrated CC / CV control loop protocol chip to form a complete package of solutions.

SMIC has achieved autonomous control of gallium nitride control chips and has successfully mass produced a number of integrated GaN direct drive controllers. With mature highly integrated GaN solutions, it has reached deep cooperation with multi-brands. The technical development of GaN devices in PD fast charging power supply can be divided into three steps:

Controller + driver + device

Controller + (driver / device)

Controller / driver / device three in one

The initial gallium nitride fast charge power supply generally needs to be designed by the combination of controller + driver + gallium nitride power devices. not only the circuit layout is more complex, the product development is relatively difficult, and the cost is relatively high. After that, the industry began to try to integrate gallium nitride power devices, PWM controllers and drivers into a package to achieve highly integrated gallium nitride sealed chip design.

SMIC has now completed the chip layout of PD fast charging full power segment, from PFC controller, gallium nitride sealed chip, synchronous rectifier chip and synchronous rectifier controller and protocol chip products to achieve a complete one-stop solution, with the advantages of simple peripheral devices, high integration, high conversion efficiency and so on.

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