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Add Buck converter in circuit

mr-black

How to connect the frequency pin

vimalraja

@copilot Add Buck converter in circuit

copilot

Sure, let's try to add a buck converter to this schema.

The buck converter requires 4 components: an input capacitor (Cin), an output capacitor (C_OUT), an inductor (L), and a control switch, which is usually a transistor such as a MOSFET. Here are my suggestions:

Input capacitor (Cin): You can add a component to your design with the designation of Cin_1 and assign it a typical value such as 10uF.
Output capacitor (C_OUT): Add this component and designate it as C_OUT_1. A typical value would be 22uF.
An inductor (L): Designate this component as L1 and assign it a typical value of 10uH.
Control Switch (Q1): Add this component as Q1. A typical component can be a N-Channel MOSFET like the FDN337N.

Regarding the connections:

Connect the positive terminal of the input voltage source to the Control Switch (Q1).
Connect the other terminal of the Q1 to one end of the inductor (L1).
Connect the other end of the L1 to the positive terminal of the output Capacitor (C_OUT_1) and to the load (if any).
Connect the ground terminal of the input source to the negative terminals of Cin and the source terminal of Q1.
Connect the negative terminal of C_OUT_1 to ground.

Also, remember the control and feedback circuitry to manage the switching of Q1. This will depend on whichever controller IC you decide to use, but the basic idea is to have the controller analyze output voltages and adjust the timing of the Q1 switching to maintain the desired output voltage.

Does this help you in setting up the Buck Converter schematic in Flux?

mr-black

How to connect feedback pin

copilot

The feedback pin (VFB) is used to ensure our output voltage maintains its intended level. To connect it, we need to create a voltage divider network using two resistors. Let's call these resistors R1 and R2:

Add resistor R1 to your project and give it a default value, say 10 kΩ.
Add resistor R2 to your project and give it a default value, also 10 kΩ.

Then, make these connections:

Connect VOUT_15:1 to R1:1.
Connect R1:2 to R2:1 and to the VFB:1 pin on your buck converter.
Connect R2:2 to one of the PGND (power ground) pins.

This arrangement forms a circuit that measures a fraction of the output voltage and sends it back to the controller as feedback. The values of R1 and R2 will determine the output voltage according to this equation:

V_{out} = V_{FB}(1+\frac{R1}{R2})

Where,

V_{FB}

is the feedback voltage which is a constant specified by the manufacturer in the data sheet, and Vout is your desired output voltage.

Please adjust the values of R1 and R2 to get your desired output voltage. The exact values you need would depend on the specifications of your particular Buck converter.

Take note that the values chosen for R1 and R2 might change under different load conditions, so depending on your specific application, you might want to adjust these values accordingly.

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Reviews

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