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according to the datasheet, what are the recommended resistor values to connect ...
C

collinsemasi

@copilot according to the datasheet, what are the recommended resistor values to connect on the feedback pin to get 3.3V output
2y

copilot

To determine the recommended resistor values for setting a 3.3V output on the MP2162 buck converter, we need to refer to its datasheet. The MP2162 uses a feedback (FB) pin to regulate its output voltage, and typically, this involves setting up a resistor divider from the output to the FB pin. The exact values can vary depending on the specific feedback voltage (V_FB) that the IC uses for regulation.
Assuming typical application circuits and standards for buck converters like the MP2162, the feedback voltage (V_FB) is often around 0.8V to 1V. However, it's essential to check the MP2162's datasheet for the exact V_FB value.
Given a V_FB and the desired output voltage (V_OUT) of 3.3V, the resistor divider can be calculated using the formula:
VOUT=VFB(1+R1R2)V_{OUT} = V_{FB} \left(1 + \frac{R_1}{R_2}\right)
Let's assume a V_FB of 0.8V for this calculation, and rearrange the formula to solve for (R_1/R_2):
R1R2=VOUTVFB−1\frac{R_1}{R_2} = \frac{V_{OUT}}{V_{FB}} - 1
Substitute the values:
R1R2=3.3 V0.8 V−1=3.125\frac{R_1}{R_2} = \frac{3.3\,V}{0.8\,V} - 1 = 3.125
Therefore, the ratio of (R_1) to (R_2) should be approximately 3.125. Common practice is to select a standard value for (R_2) and calculate (R_1) based on this ratio. For instance, if (R_2 = 10,k\Omega), then:
R1=3.125×R2=3.125×10 kΩ=31.25 kΩR_1 = 3.125 \times R_2 = 3.125 \times 10\,k\Omega = 31.25\,k\Omega
Given the need for standard resistor values, (R_2) might be selected as (10,k\Omega), and (R_1) could be approximated to (31,k\Omega) or the nearest standard value.
Please, check the MP2162 datasheet on the Monolithic Power Systems website for the exact feedback voltage (V_FB) and further application guidance. The datasheet will also provide specific recommendations or examples for resistor values for common output voltages like 3.3V, ensuring optimal performance and stability of your DC-DC converter circuit.
2y
3
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C

collinsemasi

commentFileId-a0dc84b7f31abe1d9dc7fd1ef9fbd01cfa005cba200b5a1e6b40654139841a56.png

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2y
2
Inductor sizing https://cdn2.flux.ai/flux-comment-files/files/commentFileId-e89...
C

collinsemasi

Inductor sizing

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2y
5
L1
Inductance
1.6uH
R3
Resistance
44.2kΩ
R2
Resistance
200kΩ
H2
Output Power Good LED
Line 1
------------------------------
Line 2
High=VOUT ready
Line 3
Low=VOUT below nominal
Line 4
regulation
Input Capacitors
Line 1
------------------------------
Line 2
4.7uF used to make system more stable
Line 3
0.1uF input capacitor prevents excessive input voltage ripple
Line 4
Line 4
R1
Resistance
100kΩ
Enabling the Device
Line 1
------------------------------
Line 2
Tied to VIN to alway enable device
Line 3
Might be a good Idea to add Resistor
H4
H3
H1
U1
J1
C2
Capacitance
4.7uF
J2
LED1
C3
Capacitance
22uF
C1
Capacitance
0.1uF

DC - DC Converter

DC - DC Converter thumbnail