For those unfamiliar with this topology, the Fly-Buck converter creates an isolated output with a synchronous buck regulator and coupled inductor windings (Figure 1). These designs offer several advantages over more traditional isolated power supply topologies. Since the isolated output is closely related to the primary side output voltage, no optocoupler or auxiliary winding is required; in addition, you can use a smaller transformer because the primary and secondary turns ratios have better matching. Using this method, you can get an isolated power supply design that is less expensive and has a smaller footprint. It also makes it easier to design a stable and accurate isolated power supply.
Figure 1: The Fly-Buck converter is created by adding a coupling winding to a synchronous buck converter.
Whether you need a single isolated power rail or a multi-rail power supply, the WEBENCH power design tool can now help you with the Fly-Buck design. As with all other power supply designs, you can use many of the useful features provided by the WEBENCH power supply design tool. Creating a WEBENCH Fly-Buck design is as simple as creating any other WEBENCH power supply design.
In the WEBENCH power design tool, you can create a Fly-Buck design in two ways. The first method involves the use of the WEBENCH design tool control panel. When using this control panel, first click on the "Start Design" button. Once the software is loaded, enter your Fly-Buck design requirements in the Change Inputs section (Figure 2).
Figure 2: Enter your power requirements for the Fly-Buck design in the Change Inputs section.
Click on "Use Advanced Options" to open the Advanced Options menu (Figure 3). Under Design Control, make sure the Show Alternate Topologies checkbox is selected, which will list all possible Fly-Buck solutions. After you confirm the selection of the checkbox, click the "Recalculate" button to continue.
Figure 3: Use WEBENCH Advanced Options to display alternative topologies, including the Fly-Buck design.
A list of possible solutions is provided in the WEBENCH Visual Editor, allowing you to easily classify and compare designs using different devices and topologies. Once you find that a Fly-buck design best meets your application needs, click the Open Design button to open it.
In the second method, you need to determine which device you plan to use in your Fly-Buck design. For example, you plan to use the LM5160 in a Fly-Buck design. In the LM5160 product folder, you will find a WEBENCH design tool control panel created specifically for this device (Figure 4).
When using this WEBENCH control panel, enter the input requirements for your Fly-Buck design. Make sure the “Use Isolated Output?†checkbox is selected before opening this design. This ensures that the design created in the WEBENCH power design tool uses the Fly-Buck topology instead of the normal buck topology.
Figure 4: Using the WEBENCH Product Folder Control Panel allows you to create a Fly-Buck design with a specific device (such as the LM5160).
Once the design is opened, you can optimize the design with an optimized turntable, view the schematics, change the components in the bill of materials (BOM) window, print the design report, and even share the design with your colleagues (Figure 5).
Figure 5: The WEBENCH tool provides a list of power dissipation values ​​for your Fly-Buck design, a complete BOM and a schematic.
You can even run SPICE simulations in the WEBENCH power design tool. Simply click on the "Sim" button and select your simulation type (steady state, input transient, load transient or start) and click on "Start New Simulation". When the simulation is complete, select the waveform you want to view in the waveform viewer (Figure 6). For further design customization, the WEBENCH circuit schematic editor is also available.
Figure 6: Startup and steady state waveforms generated for a Fly-Buck design in the WEBENCH power design tool
The WEBENCH Power Supply Design Tool currently supports the LM5017, LM5018, LM5019, LM25017, LM25018, LM25019, LM5160A and TPS55010 in a Fly-Buck configuration and plans to support more devices in the future.
Whether you've used the Fly-Buck converter before or heard it for the first time, the WEBENCH power design tool makes these isolated power supplies quick and easy to design. In just a few minutes, a Fly-Buck solution is presented to you, and within the WEBENCH environment, you can optimize, customize and analyze this solution right away. Give it a try. If you have any questions, please leave a message below. You will find that the design of isolated power supplies has never been easier.
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