Power Supply: AC/DC, Isolated, w/ PFC, > 90W Power Supply: AC/DC, Isolated, w/ PFC, > 90W TI Designs & reference designs Application notes & user guides Selection & solution guides Product bulletin & white papers Blogs & authored articles Similar end equipment solutions AC/DC Isolated Power Supply with PFC > 90WAn AC/DC Isolated Power Supply with PFC > 90W is used to convert the AC power lines to an isolated regulated DC output for powering notebook computers and other equipment. Typically, these operate with a wide-range of AC inputs from 85V to 265V AC (for worldwide source voltage compatibility). Generally, there is only one output in the 12V to 20V range which is compatible with most battery packs. Typically, above approximately 90W, Power Factor Correction (PFC) is used. One of the most desirable attributes of an AC/DC supply is high efficiency. To realize this, Zero Voltage Switching is incorporated. Specifically, this Active Clamp and Reset technique features the benefits of Zero Voltage Switching, simplicity and few components.

EEPROM Emulation With the TMS320F28xxx DSCs Flash Programming Solutions for the TMS320F28xxx DSCs TMS320F281x Boot ROM Serial Flash Programmingmini split unit wiringHigh Efficiency 350W AC/DC Power Supply Reference Designwindow air conditioner repair how to View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.right size ac unit 23 Nov 2015  956 views View All Technical Documents (7) PMP11303 is high-efficiency AC/DC power supply reference design with universal AC input and 25V/13.5A and 12V/1A outputs. LLC+PFC combo IC UCC29950 is applied for the main power stages with 25V/13.5A output while UCC28730 is applied for the auxiliary power with 12V/1A output.

This design has low no load power comsumption (152mW@230VAC) and over 93% peak efficiency. This design also meet 80PLUS Gold requirement for 115VAC Internal power supplies. Conduction EMI test results included Meet 80PLUS Gold for 115VAC internal power supplies 25V/13.5A and 12V/1A dual outputs 122mm x 200mm board dimension Test report is available Over 98% peak PFC efficiency at high line TI's Standard Terms and Conditions for Evaluation Modules apply. PMP11303.1(Output Voltage 1)PMP11303.2(Output Voltage 2) Vin (Min) (V)9090 Vin (Max) (V)264264 Vout (Nom) (V)2512 Iout (Max) (A)13.51 Output Power (W)337.512 Isolated/Non-IsolatedIsolatedIsolated Input TypeACAC TopologyBoost- PFCHalf Bridge- LLCFlyback- DCM Order samples, get tools and find more information on the TI products in this reference design. Design Kits & Evaluation Modules 100V, 8.7mOhm, TO-220 N-Channel NexFET™ Power MOSFET Adjustable Precision Shunt Regulator 50 mA, 24 V, 3.2-μA Iq, Low-Dropout Linear Regulator in SC70 Package

View Design Kits & Evaluation Modules Secondary Side Synchronous Rectifier Controller Offline and Isolated DC/DC Controllers and Converters 200-V Wake-up Monitor for Fast Transient Primary-side Regulation 2.5-A, 5-A, 35-VMAX VDD FET and IGBT Single Gate Driver MOSFET and IGBT Gate Drivers High-Speed, 4-A, 600-V High-Side Low-Side Gate Driver Zero Standby PSR Flyback Controller with CVCC and Wake-Up Monitoring UCC29950 CCM PFC and LLC Combo Controller PMP11303 BOM (Rev. B) PMP11303 Schematic (Rev. A) As a member ofmy.TI you can join theTI E2E™ Community where you can ask questions, share ideas and collaborate with fellow engineers and TI experts Contents are provided "AS IS" by the respective TI and Community contributors and do not constitute TI specifications. Engage in the Community Broadband RF/IF & Digital Radio Visit the TI WikiDesigners have wrestled with the question of whether to design and make their own ac-dc power supply or buy one from an outside vendor for years.

Although project criteria, available tools and components, and demands on the supply may have changed, the importance of the decision has not. A typical ac-dc unit operates from ac-line mains (nominal 120/240 V, 50/60 Hz) and delivers one or several dc rails, usually from a few volts to around 48 V, at less than 1000 W. For example, N2Power offers ac-dc supplies that provide 375 W of output between 12 and 56 V, based on the model (Fig. 1). 1. In the “make versus buy” decision, a commercially available supply such as this 375-W unit from N2Power may provide a performance, packaging, and price combination that is very difficult to achieve and verify. But today’s supplies must do more than deliver power. They have to meet increasingly stringent safety regulations, electromagnetic/radio-frequency interference (EMI/RFI) standards, efficiency mandates, and power factor correction (PFC) objectives. In some specialty applications, such as medical instruments, they also have to keep leakage below a certain threshold and ensure that component failures won’t cause life-threatening conditions.

Today’s ICs make it much easier to design your own power supply. Many ICs embed control and algorithms for PFC, enhancing efficiency, transient response, and load/line performance, while minimizing EMI. Their advanced topologies and operational modes would be difficult to design yourself. Some ICs support digitally controlled supplies, where your system can monitor many of the supply’s internal parameters and adjust them dynamically for optimal operation depending on internal factors such as loading as well as external considerations like ambient temperature and ac power costs. Further, vendors offer reference designs and development tools that can, at first glance, make the supply design almost trivial. These materials fall into two categories. In the first, you get a detailed reference design for a specific supply such as 375 W, 48 V dc that includes a schematic, printed-circuit board (PCB) layout, and bill of materials (BOM). In the second, you use the vendor tools to define your specifications.

The tools then return with the appropriate IC or ICs, passive components, schematic, layout, and performance curves. Most often, designers craft their own power supply because the product’s form factor is unusual or unique. Apple’s notebook power supply is a good example (Fig. 2). Sometimes, standard supplies can’t meet the packaging constraints. 2. Sometimes in-house design is preferred due to the unique nature of the product, as in Apple’s MagSafe ac-dc power supply. In addition, the higher volumes of these consumer products may be a strong justification for custom design. If you’re looking at around 1000 units per month or more, you’ll be amortizing the design and qualification process, and careful BOM analysis may show you can achieve higher profit margins. Also, your requirements may fall outside of what’s available, or few vendors may meet enough of your requirements, prompting you to design your own supply. Some supplies might require a high dc voltage, like greater than 1000 V, though some suppliers may come close enough to what you need or can modify what they offer.

Power supply design is a balance among tradeoffs and constraints of nominal performance, efficiency, thermal issues, maximum/minimum parameter performance, cost, complexity, reliability, technical risk, and BOM supplier uncertainty. Still, there are some applications where one parameter is so overwhelmingly critical that only a custom, do-it-yourself supply will fit, since no commercially available unit is prioritized for that parameter. You also may design your own supply if your requirements are looser than commonly available supplies, and you can get away with less. A supply for basic indicator lights may have loose nominal specs for output accuracy, say ±5%, and few or no transient load issues, so a low-cost design may be all that’s needed. At the other end, you may need specs that are far better than what’s available, which is sometimes the case for science applications. A final reason to design your own is in-house expertise. If you have been designing supplies for years and are familiar with balancing, meeting, and testing to technical and regulatory requirements, then you’re ahead of many design OEMs whose expertise is in digital design.

Basic supply design may be straightforward, but a fully qualified design that meets all of the performance and regulatory specifications is not. And that’s not even accounting for the cost and sourcing of the many components in the complete design. Start with the design itself. ICs can implement a complex topology, but every ac-dc supply needs many non-IC components. Defining and sourcing them can be a headache, especially when their secondary characteristics play a role. For example, capacitance and working voltage define a capacitor, but its equivalent series resistance (ESR) affects its operation, especially at higher frequencies. Even with the right part, you face supplier issues. Your purchasing group may substitute a nominally identical part for an inductor, for instance, to save cost. As a result, field problems may appear months later. You also need to decide the minimum and maximum operating ranges for your design: will it be for a restricted-range line voltage, such as nominal 120 V ac ±10%, or full range (120/240 V ac)?

The former design is somewhat easier and less costly, but it also means you need a second design for the other ac mains if you’re planning to serve worldwide markets. You need a test plan for the design. How will you ensure that it works in corner cases, such as high/low line plus maximum ambient temperature, plus line/load transients, all happening at once? Are you planning to use convection cooling? Do you have the tools to model your supply and its operating environment to be certain that the available airflow will be sufficient? Which way is the supply mounted in use, anyway? It makes a big difference in the cooling situation. If you find out that you need a fan, how will you size it? If you’re designing your own supply, you’re most likely using an IC or chipset from a vendor that also provides a reference design. Has the reference design been built, or is it just a schematic supported by simulation? You’ll likely find that actual performance is not where it was supposed to be, as physical layout, routing and size of ground plane, power and control traces, and connectors will make even the best simulation only a rough approximation of what the actual circuit will do.

Even if the reference design includes a printed-circuit board (PCB) layout, you have to be very careful if you make any change to the layout or BOM. An apparently trivial change can adversely affect performance. A power supply is a closed-loop amplifier that can oscillate, have transient-response issues, and both source and be sensitive to EMI/RFI. Even a well-designed and tested supply faces regulations and standards. These mandates are getting even more challenging as tighter standards are being phased in each year. They cover: Adding to the challenge is the worldwide nature of regulations, which means you’ll be dealing with many regulatory authorities and their unique ways of testing and doing business. Today’s ICs, reference designs, and tools make it easier than ever to design your own supply. Yet the combination of specifications in the N2Power unit in Figure 1 would be very hard for a non-expert to achieve, especially when all regulatory and manufacturing issues are added in.