The next step is to assign some net labels in different portions of the schematic. My wired schematic is shown below: Wired schematic without net labels. Once you’re satisfied with the initial arrangement of components, you can start wiring everything together. If you want to use a larger switching frequency, you could then use a smaller inductor while still meeting your ripple requirements. Note also that the inductor in the feedback line is rather large as this is intended to reduce ripple on the output from the buck converter circuit (see page 13 of the LM73606 datasheet). The LM73606 is a synchronous DC-DC converter, so the feedback line is wired up for synchronous operation by following the guidelines in the LM73606 datasheet (see page 12). These decoupling capacitors are C14, C15, and C16. The output from the LM73606 uses two decoupling capacitors to ensure stable power reaches the TPS2549 USB switches. The second bank of capacitors in the upper middle portion of the schematic are part of the buck converter feedback loop.
The bank of capacitors in the upper left are intended for decoupling/bypassing on the input power. Here’s my initial schematic with unconnected components. I’ve laid out the schematic in this way just to develop an initial floor plan as it is easier to move around unconnected components. The image below shows the initial schematic without any connections between components. To get started, I’ve placed everything in a single schematic as the part count is not so high as to warrant hierarchical schematics. The rest of the required components can be accessed from the Manufacturer Part Search panel or from an existing library. You can find the Socket component in the Miscellaneous Connectors.IntLib library file. This is essentially a pad that is used to connect to the power supply (see the 12V, GND, and DIM sockets). Although not components per se, there are three Socket connectors that will appear in the schematic.
The charger requires 12 V of power and charges two external devices through two USB ports.
#MOLEX CONNECTOR ALTIUM LIBRARY PORTABLE#
Here, I’ll present the overall design process for a portable USB charger. If you want to build your own USB charger, you can create your own USB charger board with the powerful schematic design and layout tools in Altium Designer. Or if you're using a database, and have an inventory of equivalent parts, make sure that you have in-house part numbers for each distinct type, and they are referenced accordingly in the BOM.When I’m in my office, I keep my pluggable USB charger around, otherwise the battery on my phone is likely to run out. Or you can go a more generic route, using, say, header symbols from the preinstalled libraries, modifying them on the schematic to add supplier link(s) and footprint. Obviously, you only need as many footprints as there are different part footprints. If you prefer having a complete library, then make a new SchLib Component for each type, and link each one with its respective footprint. (And by that, I mean, you can cut it however you like. If it's a footprint change, or mechanically or electrically different, put it in a new part. As others have said, don't add multiple if they aren't equivalent. Make sure the extra fields are enabled in the BOM output, and if you are using a template, that it has those fields as well. You need to go to Tools/Preferences, Data Management, Suppliers, and tick Suffix for the relevant fields (supplier and mfg fields) so they will show as multiples. You can keep adding supplier links for equivalent parts.
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