Output Voltage Calculation

Thought for 41 sec

The output voltage for a buck converter using a resistor divider is given by:

\Large V_{\text{out}} = V_{\text{FB}}\left(1 + \frac{R_1}{R_2}\right)

For the TPS5430DDA, the typical feedback reference voltage, ( V_{\text{FB}} ), is 0.8 V.

With the resistor values provided:

( R_1 = 33,kΩ )
( R_2 = 10,kΩ )

the calculation is:

\Large V_{\text{out}} = 0.8\,V \left(1 + \frac{33\,kΩ}{10\,kΩ}\right) = 0.8\,V \times (1 + 3.3) = 0.8\,V \times 4.3 = 3.44\,V

Thus, using the current resistor divider, the output voltage is approximately 3.44 V.

Note:
To obtain a 5 V output, you would need to adjust the resistor values. For example, if ( V_{\text{out}} = 5,V ) is desired with ( V_{\text{FB}} = 0.8,V ), then:

\Large 5\,V = 0.8\,V\left(1+\frac{R_1}{R_2}\right) \quad \Longrightarrow \quad \frac{R_1}{R_2} = \frac{5}{0.8} - 1 = 6.25 - 1 = 5.25

If you set ( R_2 = 10,kΩ ), then ideally:

\Large R_1 = 5.25 \times 10\,kΩ = 52.5\,kΩ

You may choose the nearest standard resistor value (e.g., 51 kΩ or 56 kΩ) and recalculate to fine-tune the output voltage.

toastedsteve

is this capable of 5A output

Thought for 12 sec

flux

The TPS5430DDA is typically rated for an output current around 3A. This means that as configured, it is not capable of supporting a continuous 5A load.

For a 5A output, you would need to select a buck converter that is specified to handle currents in excess of 5A or consider paralleling appropriate devices designed for such loads.

Let me know if you need recommendations for alternative components or additional design adjustments.

Search for 5A buck

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list all IC1 pins in a table format. For each pin provide its pin number, pin na...

dimagre

@copilot list all IC1 pins in a table format. For each pin provide its pin number, pin name and function.

copilot

Sure! Here's a table listing the pins of IC1 (TPS5430DDA), including the pin number, pin name, and expected function:

Table

Pin Number	Pin Name	Function
1	BOOT	Bootstrap capacitor connection
2	NC	No connection
3	NC	No connection
4	VSENSE	Voltage sense input
5	EN	Enable input
6	GND	Ground
7	VIN	Input voltage
8	PH	Phase node
9	GNDPAD	Ground pad

If you need more information about any specific pin function, feel free to ask!

Someone is typing...

VIN

vout

IC1

Capacitance

100nF

Resistance

33kΩ

Resistance

10kΩ

Capacitance

100uF

Inductance

10uH

GND

Reviews

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Project Name

12v - 5v converter placeholder

Description

This project involves designing a DC-DC buck converter circuit to efficiently step down a 12V input voltage to a stable 5V output voltage. The converter is suitable for various electronic applications requiring 5V DC supply from a 12V source.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Arrow	$3.18–$4.70
Digi-Key	$4.78–$4.99
LCSC	$0.73–$0.86
Mouser	$5.04–$5.22
Verical	$4.45–$4.79

Controls

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dimagre / 12v - 5v converter placeholder

Schematic