ST Unveils L4983 to Support Low-Power, High-Efficiency Power Design
TECHWORLD ·
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STMicroelectronics (ST) on the 14th released its new highly integrated PFC controller, the L4983.
The L4983 features a Multiplier Emulator, a distortion optimization circuit, and a 7A Sink·3A Source Totem-Pole output, and supports CCM PFC circuit implementation with a minimum number of external passive components.
ST also provided the EVL4983-350W demo board, which is configured as a 350W PFC pre-regulator supporting a universal input voltage range and has 97.4% efficiency.
STMicroelectronics (ST) on the 14th released its new highly integrated PFC controller, the L4983. The new product is designed to simplify the design of continuous conduction mode (CCM) power factor correction (PFC) circuits.
The L4983 integrates a proprietary Multiplier Emulator and a distortion optimization circuit. It also supports CCM PFC circuit implementation with a minimum number of external passive components, while providing a 7A Sink·3A Source Totem-Pole output.
The device is suitable for power supplies ranging from hundreds of watts to kilowatts. Its main target applications are power supplies that must meet global power quality and efficiency standards.
Examples include home appliances, industrial power supplies, medical power supplies, high-power lighting equipment, servers, and PC. It is also intended for designs that need to meet PFC requirements such as EN 61000-3-2 and Japan's JEIDA-MITI standard.
ST expects the L4983 to help reduce power supply design complexity while improving efficiency and system performance.
To that end, the L4983 offers 3 power-saving modes that help meet Energy Star, the EU Ecodesign Directive, and the European Code of Conduct.
In burst mode, switching automatically stops at light load and no load, and resumes quickly when the load increases without a soft restart. In pin-controlled idle mode, switching is temporarily suspended and the internal error amplifier is shut down. In disabled mode, device operation stops completely and then resumes with the soft-start function.
Through the controls described above, the system reduces unnecessary power consumption under a wide range of load conditions and improves the overall energy efficiency of the power supply.
The L4983 includes a range of protection features to maintain stable power delivery even under harsh operating conditions. It provides overvoltage protection to stabilize output during transient conditions, and also offers cycle-by-cycle overcurrent protection using an internal comparator. It also includes inductor saturation detection to prevent abnormal current and surges.
The Line Feedforward function helps maintain stable output power even when the AC input voltage fluctuates. During startup, it verifies the voltage feedback and current sensing signals, with this signal verification process intended to protect the system from feedback loop faults.
The soft-start function actively limits inrush current. It also improves the stability of output voltage regulation.
ST has provided the EVL4983-350W demo board to accelerate development of switch-mode power supplies using the L4983. The EVL4983-350W board implementation is configured as a 350W PFC pre-regulator supporting a universal input voltage range, with a stabilized 400Vdc output, low total harmonic distortion (THD) across the full load range, and 97.4% efficiency.
Source: TECHWORLD · Park Gyu-chan
Original: https://www.epnc.co.kr/news/articleView.html?idxno=406889
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Source: TECHWORLD
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