Dear Expert,
I designed the schematics and layout for TPS62913, the schematics was got from Webench, Kindly verify my layout and let me know the updates.
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Dear Expert,
I designed the schematics and layout for TPS62913, the schematics was got from Webench, Kindly verify my layout and let me know the updates.
The layout looks very good. However, for 12 to 3.3V, I would recommend using the 2.2MHz setting and a 2.2uH inductor as shown in the datasheet for the lowest ripple. See Table 8-2 below. If you are confident that you want the S-CONF pin tied to GND with the 1MHz setting and 4.7uH inductor, then you can keep it this way. To give yourself some flexibility to try some of the features of the part such as 2.2MHz fsw, output discharge or spread spectrum, you could add a resistor to GND from the S-CONF pin.
Dear sir,
Im not sure about this design,kindy give a guide like how to choose 2.2MHz setting.
The switching frequency and several other features can be selected by connecting a resistor from the S-CONF pin to GND, or by connecting it directly to VIN if you want all the other options disabled. The value of the resistor can be selected by using Table 7-1 in the datasheet, which I have copied below for your convenience.
I am inquiring with the WEBENCH team why I am not able to change both the inductor and the switching frequency for the 12V to 3.3V supply and get a new simulation. However, I have tested the 12V to 3.3V application with 2.2MHz and 2.2uH inductor per the table 8-2 and it works very well. This solution was also used in the ADC app note here: https://www.ti.com/lit/pdf/slvaew7.
That would depend on your application and if the transient response is adequate for your device. Typically this is not required, as the load is fairly constant for clocking and other applications using this device. What does your load profile look like?