Make a donation to Elecfarm1. Specifications
- Dimension: 21×21mm.
- Input voltage: 4.5V÷28V.
- Fixed out voltage: 3.3V (You can adjust the voltage by changing feedback resistors).
- Current output: 3A.
Figure 1: Dimension of board
2. Notations
- +VIN: Input voltage.
- GND: Common Ground for input and output voltage.
- +3V3: Output voltage.
3. Schematic Design
Figure 2: Operating principle of relay module
4. 3D model
Some images are about this board you can see at https://youtu.be/jVNwZ8kD4Sc 
| Line # | Designator | Name | Description | Quantity | Manufacturer 1 | Manufacturer Part Number 1 | Link |
|---|---|---|---|---|---|---|---|
| 1 | C1 | 10uF | 10µF ±20% 50V Ceramic Capacitor X5R 1210 (3225 Metric) | 1 | Taiyo Yuden | CEUMK325BJ106MM-T | Amazon: 20PCS SMD Ceramic Capacitors 1210 106 10% X7R 1210 1... |
| 2 | C2 | 22uF | 22µF ±10% 25V Ceramic Capacitor X5R 1210 (3225 Metric) | 1 | KEMET | C1210C226K3PACTU | https://amzn.to/33zMOs9 |
| 3 | C3 | 220pF | 220pF ±10% 100V Ceramic Capacitor BX 0805 (2012 Metric) | 1 | KEMET | CDR01BX221BKUS7185 | Amazon: Aexit 200Pcs 50V Passive Components 220pF Capacitanc... |
| 4 | C4 | 0.1uF | 0.1uF 50V | 1 | KEMET | C0805C104K5RACTU | https://amzn.to/3aUmz24 |
| 5 | D1 | SS34 | 3A 40V SS34 SMA | 1 | Multicomp | SS34A | https://amzn.to/2QbmNd4 |
| 6 | L1 | 4.7uH | RLF7030T-4R7 4.7µH Shielded Wirewound Inductor 3.4A 31.2 mOhm Max Nonstandard | 1 | TDK | RLF7030T-4R7M3R4 | Ebay: https://www.ebay.com/itm/Drossel-Ferrit-SMD-4-7uH-3-4A... |
| 7 | R1 | 124K | 124 kOhms ±1% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Moisture Resistant Thick Film | 1 | Yageo | RC0805FR-07124KL | Ebay: https://www.ebay.com/itm/Qty-100-124K-ohm-1-1-8W-0805-... |
| 8 | R2 | 40K2 | 40.2 kOhms ±1% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film | 1 | Stackpole Electronics | RMCF0805FT40K2 | Ebay: https://www.ebay.com/itm/50PCS-1-8W-0805-SMD-SMT-Resis... |
| 9 | R3 | 68K | 4.7 kOhms ±1% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film | 1 | Vishay | CRCW0805680KFKEA | Amazon: Cement Resistor,Ltvystore 30Packs 10W 10 Ohm 5% Woun... |
| 10 | R4 | 24K9 | 200 Ohms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film | 1 | Yageo | RC0805FR-0724K9L | Ebay: https://www.ebay.com/itm/50PCS-1-8W-0805-SMD-SMT-Resis... |
| 11 | R5 | 100K | 100 kOhms ±1% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Moisture Resistant Thick Film | 1 | Yageo | RC0805FR-07100KL | Amazon: Cement Resistor,Ltvystore 30Packs 10W 10 Ohm 5% Woun... |
| 12 | R6 | 200K | 200 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film | 1 | Stackpole Electronics | RMCF0805JT200K | https://amzn.to/2U7vtn3 |
| 13 | U1 | MP1584 | Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 3A 8-SOIC (0.154", 3.90mm Width) Exposed Pad | 1 | Monolithic Power Systems | MP1584EN-LF-Z | https://amzn.to/2JasvYF |
| 14 | Wire | 1 | Amazon: CBAZY Hook up Wire Kit (Stranded Wire Kit) 18 Gauge ... |
| Name | Size | # Downloads |
|---|---|---|
| Buck 3A MP1584.GBL | 3.82 kB | 395 |
| Buck 3A MP1584.GBS | 212 B | 296 |
| Buck 3A MP1584.GKO | 550 B | 282 |
| Buck 3A MP1584.GM1 | 162 B | 294 |
| Buck 3A MP1584.GTL | 14.23 kB | 301 |
| Buck 3A MP1584.GTO | 119.95 kB | 339 |
| Buck 3A MP1584.GTP | 4.1 kB | 334 |
| Buck 3A MP1584.GTS | 4.15 kB | 319 |
| Buck 3A MP1584.TXT | 563 B | 324 |
| Status Report.Txt | 307 B | 262 |
| Revision | Created | Layers | Dimensions |
|---|---|---|---|
| rev1 | 5 years ago | 2 | 21 × 21 |