Power net portal is a special schematic object used to define a power or ground net. Power ports allow you to conveniently indicate a power net at any location in the design. Power nets of the same designator automatically connect throughout your design #portal #power
A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
https://cdn2.flux.ai/flux-comment-files/files/commentFileId-e01a46c1143d69b497bb6809facdf9cc630d5614932ac3fbc34db024585ca6e3.png?GoogleAccessId=graviton-mvp%40appspot.gserviceaccount.com&Expires=4886219344&Signature=WyVWVDggwBP%2BUO6FEem2S%2BF1XSNJm9c5GrnJg8CAjBrxPjY7zH7UlmtksaIhKJKzcfUKZcI2PLDCEwXxw0Ju3NCpRyzyOl1g2kG6XVy2pY1zzE9bJ%2F7Li25aHba4WFIaG4drgRkA2V0fOXAa%2F4cAn5tZGdD9keMrbojRg0%2Bjv74Ytc0AA9iPfSDN9KqTLf6yFhr01ksIlhuweAzd1xJt5UxCnW7i8tphvqPuu3Vk9msR0WUnLNqeuJp0m8TZEbNNv%2Fq1HVKD6KqQEGN0n7W2JcDwrxQbUNkWZJrse1xYtArhCx9lX5%2B2tOXm2P9G4HyEQ46thTAiyG27%2FFF%2F1iYX4A%3D%3D cal the value for L
To calculate the value for the inductor $L$ in your application using the TPS61175, you'll use the formula provided in your document. The formula for the inductance $L$ is given by:
L≥fSW×ILIM×VOUT(VOUT−VIN)×VIN×RPL×POUT
However, based on the context and standard practices for inductor selection, another common formula used for calculating the minimum inductance needed to achieve a certain ripple current $\Delta I$ can be expressed as:
L=fSW×ΔIVIN×(VOUT−VIN)
Where:
$V_{\text{OUT}}$ is the desired output voltage.
$V_{\text{IN}}$ is the input voltage.
$f_{\text{SW}}$ is the switching frequency.
$\Delta I$ is the inductor ripple current. Typically, it's chosen to be about 20-40% of the maximum output current.
It seems like there might be some context missing from the text provided (such as assumed ripple current percentage), and your scenario might be slightly different, given the addition of $R_{\text{PL}}$ and $P_{\text{OUT}}$ considering load and output power losses specifically.
Given this, could you provide any additional details such as:
The specific input and output voltages?
The output power or current required?
The preferred switching frequency or any constraints?
With this information, we can help determine the appropriate inductor value for your application.
Let's select an inductor ripple current, ΔI, which is typically around 20-40% of the output current. Let's assume 30% for a balance between efficiency and component size:
ΔI=0.3×3A=0.9A
We can use the following formula to find the minimum inductance required:
L=fSW×ΔI×VOUTVIN×(VOUT−VIN)
Let's calculate the inductance:
Use the lowest VIN of 2.9 V for worst-case scenario.
Plug these values into the formula:
L=400×103Hz×0.9A×5V2.9V×(5V−2.9V)
Let's calculate this value.
Code Interpreter
Python
# Given values
Vin_min = 2.9 # minimum input voltage in volts
Vout = 5.0 # output voltage in volts
I_out = 3.0 # output current in amps
fsw = 400e3 # switching frequency in hertz
Delta_I = 0.9 # ripple current in amps
# Calculating the inductance
L_min = (Vin_min * (Vout - Vin_min) / (fsw * Delta_I) * Vout)
L_min
The minimum inductance required for your application is approximately 84.6 µH.
When choosing an inductor, consider one that is close to this value with an appropriate current rating, ensuring it can handle the peak and continuous operating conditions. Additionally, check the saturation current rating to be sure it can handle the higher currents without saturating.
Let me know if there's anything else you'd like to discuss or calculate!
2mo
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