Start your smart POWER SUPPLIES design with LTpowerCAD

The upper half of Figure 2 shows the screen where you can enter design specifications and specify the selection criteria for POWER SUPPLIES IC, as well as information such as the reference circuit and pin layout of the selected product.
The lower half displays a list of POWER SUPPLIES ICs that meet the set conditions.
In the upper left corner of the window shown in Figure 2, there is a column called "Converter Specification."
The designer will enter the design specifications into the list highlighted in light blue in the Converter Specification column.
You do not need to fill in everything, but if any fields are left blank, there is a possibility that a large number of products will be picked up, so it is better to clarify the design conditions as much as possible in advance.

Figure 3. Designer input items

Next, in the center of Figure 3, there is a screen for selecting the converter topology and type. You can specify the topology and type of devices to list. You can select from nine types of topology as shown in Figure 4, and four types of device as shown in Figure 5.
If you select ALL, it will pick from all products, but in order to find the best product, it is recommended that you specify it according to your system.

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  Figure 4. Topology selection

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  Figure 5. Type selection

Additionally, the "Optional Features" checkbox on the right side of Figure 3 allows you to select additional functions such as Enable or product features such as Low EMI, allowing you to search for devices that meet your system requirements.
Once you have specified the conditions up to this point, click the "Search Parts" button in "Converter Specification" (Figure 6).

Figure 6. Starting a parts search

As shown in Figure 7, products that meet the specified criteria will be picked up in the lower half of the screen, and various information such as the year of release and efficiency will be displayed in a list.
Select the product you want to design from the list and proceed to the next step. Clicking Start LTpowerCAD Design Tool in the list will switch to the design screen for the selected product, as shown in Figure 8.

Figure 7. Device list

Figure 8. Reference circuit design screen

Additionally, by clicking the "Loss Estimate & Breakdown" tab on the design screen, you can check a graph of the efficiency curve, as shown in Figure 10 below. Here too, the light blue list fields can be entered by the designer, allowing you to adjust constants while checking efficiency.

Fig. 10 Efficiency characteristics graph page

If you click the "Loop Comp. & Load Transient" tab, you can also check the Bode diagram and load response waveforms, as shown in Figure 11 below.
In the load response characteristics, you can check load fluctuations under various conditions by setting the load step conditions.
As shown here, the process of tuning the constants is very simple, as a design "starting point" is automatically generated once the designer enters their specifications and selects their product.
Since it is possible to check the phase margin, load response, etc. all at once, designers can adjust the constants while keeping in mind which parts need to be relaxed or tightened.

Figure 11 Bode diagram and transient response characteristics page

Finally, you can check the results of your adjustments as a summary. Clicking the "Power Design Summary" tab will display a summary of the basic design conditions and BOM list, as shown in Figure 12 below.
The total mounting area is estimated from the BOM. Although it is only a reference circuit and is conditional, you can check the potential.

Figure 12. Design summary page

The contents of the four tabs can be output as a Summary Report.
Select File in LTpowerCAD, click "Print Summary Report," and select Microsoft Print to PDF when selecting the printer to save the report in PDF format. If you want to save this design information, click "Save As" as shown in the image and save the file. The file extension will be ".ltpc."

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  Figure 13 Summary report output

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  Figure 14 Saving design data

Using LTpowerCAD, we check the characteristics and repeatedly adjust the circuit constants to address any issues that come to light.
It is also important to consider whether the required specifications for POWER SUPPLIES are appropriate.
It is easy to align conditions or, conversely, change conditions, so I believe that using LTpowerCAD will help improve design efficiency.