With the development of Internet of Things (IoT), especially smart lighting and smart home, high efficiency and high performance small size power supply is more and more demanded by the market. How can we ensure the best performance while making the power supply smaller? ON Semiconductor to provide based on the NCL2801+NCP13992 a complete set of programs you need: adapted to gallium nitride (GaN) switching devices, working in high-frequency switching frequency occasions of small volume PFC & LLC program.
The NCL2801 is a member of ON Semiconductor's family of PFC control chips for switching power supply solutions. Built-in valley count frequency return (VCFF), valley turn-on and other technologies to provide excellent total harmonic distortion (THD) and power factor (PF) value performance. It is suitable for LED lighting, PC power supply and flat-panel TV applications that require high PF and low THD.
NCP13992 as a member of ON Semiconductor LLC resonant half-bridge controller family, in the NCP1399 excellent performance on the basis of the innovative addition of light load mode (LL mode), Quiet SKIP mode, significantly improve the efficiency of the whole machine in the case of light loads, and effectively inhibit the hiccups under the mode of the noise problem.
Program Features:
1. The use of critical mode current-type PFC controller NCL2801, internal integration of valley turn-on technology, in addition to excellent THD and PF value performance, but also has excellent efficiency performance;
2. The use of the industry's well-known current-type LLC topology driver chip NCP13992, based on the realization of high-frequency switching operation, to achieve the miniaturization of the power supply, and has excellent efficiency performance;
3. Simple external circuit, which is conducive to simplify the PCB layout work;
4. LLC full-load operating frequency of 300KHz or so, perfectly adapted to the current market hot GaN products, the realization of the LLC part of the high-frequency design;
5. Perfect protection: over-temperature protection (OTP), over-voltage protection (OVP), over-current protection (OCP) and so on;
6. NCP13992 enters Light Load (LL) mode and Skip Cycle (SKIP) mode under light load conditions, which gives the whole machine excellent light load efficiency and standby power consumption performance;
Application Areas:
-High PF value, low THD and other applications, such as LED lighting industry;
-High efficiency, high operating frequency, high power density requirements of applications AC-DC switching power supply;
Examples of Applications
1. Physical Diagram of the Program:
2. Typical Application Schematic and Circuit Introduction:
PFC part of the use of ON Semiconductor NCL2801 products, SOIC-8 package, the peripheral circuit is simple. FB foot for the output voltage sampling signal input, as a feedback signal input at the same time as the output voltage OVP function to protect the MULT foot of the external resistor voltage divider, sampling the input AC voltage, used to determine the range of the input voltage as well as to set up the BO function to protect. In the design process, it is also necessary to pay attention to the value of the external resistor (R10) at the CS pin: R10 is fixed at four levels, respectively 100Ω, 330Ω, 620Ω and 1000Ω.
The size of the value of R10 determines the size of the load changes, the MOS tube switching process of the first fixed jump CTRL foot of the voltage size, the larger the value of R10, the first valley jump when the load is larger. We recommend the use of 100Ω or 330Ω resistors to have a better THD performance while also having a better efficiency performance.
For the LLC part, we use ON Semiconductor's NCP13992 in a SOIC-16 package. As a current-type control of the LLC controller, has a fast feedback loop response speed, with excellent dynamic response performance.
NCP13992 built-in high-voltage start-up pin HV pin, can withstand a maximum start-up voltage of 600V.
The PFCFB pin has a built-in 1V voltage reference to detect the PFC part of the voltage, which is used to set the startup voltage point of the LLC circuit. The SKIP pin has a built-in 50uA constant-current source, and the external ground resistor generates a voltage that is compared with the FB voltage, which is used to set the load point for the NCP13992 to enter the SKIP mode.
The LLCCS pin has a built-in 4.35V (varies by version) reference, which detects the voltage on the resonant capacitor through external capacitor voltage divider (C15,C25,C26 and R30), and is used to realize the detection of the primary resonant cavity current size and OCP protection.
PFCMODE pin is the voltage output, when the VCC voltage is higher than Vcc_on, PFCMODE will have a stable voltage output (about 12V in normal operation). This voltage can be used to power the VCC pin of the PFC part controller.
3. Excellent Standby Power Consumption and Efficiency Performance:
4. Excellent PF Value Performance:
Program Application Summary
As proven PFC and LLC controllers in the market, NCL2801 and NCP13992 have won the recognition and preference of many power engineers for their excellent performance. In the high-frequency application scenario of driving GaN devices, NCL2801 and NCP13992 still have excellent performance: stable and high efficiency, but also has perfect protection, excellent THD, PF value and standby power consumption. Therefore, as high-frequency and small-size lighting solutions adapted to GaN switching devices, NCL2801 and NCP13992 will be welcomed by everyone.
For more exciting articles, please click perceptive-ic.com.
