{"product_id":"dc-dc-step-down-converter-20a-power-adjustable-step-down-power-supply-module","title":"DC-DC Step Down Converter 20A Power Adjustable Step-Down Power Supply Module","description":"\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#0056B3;font-size:14px;line-height:22px;letter-spacing:1px;text-transform:uppercase;margin:0 0 24px 0;\"\u003ePower Supply · DC-DC Converters · Step-Down Buck Module · 20A Rated\u003c\/p\u003e\n\n\u003ch2 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:22px;line-height:30px;margin:32px 0 16px 0;\"\u003eWhat Is This 20A Step-Down Converter Module?\u003c\/h2\u003e\n\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#333333;font-size:16px;line-height:26px;margin:0 0 16px 0;\"\u003eThe \u003cstrong\u003eDC-DC Step Down Converter 20A Power Adjustable Step-Down Power Supply Module\u003c\/strong\u003e is a non-isolated buck converter that accepts a higher DC input voltage and regulates it down to a lower, user-adjustable DC output — with up to 20A continuous current capability. It uses pulse-width modulation (PWM) switching with synchronous rectification to achieve conversion efficiency typically above 90%, meaning less heat and smaller heatsink requirements compared to linear regulators.\u003c\/p\u003e\n\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#333333;font-size:16px;line-height:26px;margin:0 0 16px 0;\"\u003e\u003cstrong\u003eIn short:\u003c\/strong\u003e If you need to step a higher DC voltage down to a stable, adjustable lower voltage at up to 20 amps — for LED strips, battery charging, DC motor testing, or bench power — this module does the job with high efficiency.\u003c\/p\u003e\n\n\u003ch2 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:22px;line-height:30px;margin:32px 0 16px 0;\"\u003eWhat to Check Before Wiring It Up\u003c\/h2\u003e\n\n\u003ch3 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:18px;line-height:26px;margin:24px 0 8px 0;\"\u003e1. Input-Output Voltage Differential\u003c\/h3\u003e\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#333333;font-size:15px;line-height:24px;margin:0 0 16px 0;\"\u003eBuck converters need the input to be meaningfully higher than the output — typically at least 2-3V of headroom. If you feed it 12V and need 11V out, regulation may be unstable. Confirm your input rail can supply enough voltage overhead, especially when the input sags under load.\u003c\/p\u003e\n\n\u003ch3 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:18px;line-height:26px;margin:24px 0 8px 0;\"\u003e2. Current De-Rating at High Temperature\u003c\/h3\u003e\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#333333;font-size:15px;line-height:24px;margin:0 0 16px 0;\"\u003eThe 20A rating assumes adequate airflow and an ambient temperature within the module's design range. If you are mounting this inside a sealed enclosure without forced air, derate by 30-40%. A small 12V fan blowing across the heatsink will let you run closer to the rated current continuously.\u003c\/p\u003e\n\n\u003ch3 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:18px;line-height:26px;margin:24px 0 8px 0;\"\u003e3. Output Ripple and Your Load Type\u003c\/h3\u003e\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#333333;font-size:15px;line-height:24px;margin:0 0 16px 0;\"\u003eSwitching regulators produce ripple on the output — typically 50-150mV peak-to-peak depending on load. If you are powering sensitive analog circuits, audio amplifiers, or precision sensors, add an LC filter or a low-dropout (LDO) post-regulator on the output.\u003c\/p\u003e\n\n\u003ch2 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:22px;line-height:30px;margin:32px 0 16px 0;\"\u003eKey Specifications\u003c\/h2\u003e\n\n\u003ctable style=\"width:100%;border-collapse:collapse;border:1px solid #eeeeee;font-family:Arial,Helvetica,sans-serif;font-size:14px;\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:40%;background-color:#f4fcfc;padding:12px 16px;border:1px solid #eeeeee;color:#111111;font-weight:bold;\"\u003eModule Type\u003c\/td\u003e\n      \u003ctd style=\"background-color:#f4fcfc;padding:12px 16px;border:1px solid #eeeeee;color:#333333;\"\u003eDC-DC Step-Down (Buck) Converter\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:40%;background-color:#fafafa;padding:12px 16px;border:1px solid #eeeeee;color:#111111;font-weight:bold;\"\u003eMax Output Current\u003c\/td\u003e\n      \u003ctd style=\"background-color:#fafafa;padding:12px 16px;border:1px solid #eeeeee;color:#333333;\"\u003e20A (continuous, with adequate cooling)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:40%;background-color:#f4fcfc;padding:12px 16px;border:1px solid #eeeeee;color:#111111;font-weight:bold;\"\u003eInput Voltage Range\u003c\/td\u003e\n      \u003ctd style=\"background-color:#f4fcfc;padding:12px 16px;border:1px solid #eeeeee;color:#333333;\"\u003eVerify from product label — typical range 6-40V DC\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:40%;background-color:#fafafa;padding:12px 16px;border:1px solid #eeeeee;color:#111111;font-weight:bold;\"\u003eOutput Voltage Range\u003c\/td\u003e\n      \u003ctd style=\"background-color:#fafafa;padding:12px 16px;border:1px solid #eeeeee;color:#333333;\"\u003eAdjustable via onboard potentiometer; verify range from label\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:40%;background-color:#f4fcfc;padding:12px 16px;border:1px solid #eeeeee;color:#111111;font-weight:bold;\"\u003eConversion Topology\u003c\/td\u003e\n      \u003ctd style=\"background-color:#f4fcfc;padding:12px 16px;border:1px solid #eeeeee;color:#333333;\"\u003eSynchronous rectification, PWM-controlled\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:40%;background-color:#fafafa;padding:12px 16px;border:1px solid #eeeeee;color:#111111;font-weight:bold;\"\u003eCondition\u003c\/td\u003e\n      \u003ctd style=\"background-color:#fafafa;padding:12px 16px;border:1px solid #eeeeee;color:#333333;\"\u003eNew\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#555555;font-size:13px;line-height:20px;margin:8px 0 24px 0;\"\u003e\u003cem\u003eFor detailed schematics, pinout, and full electrical characteristics, refer to the manufacturer datasheet or contact our team for available documentation.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:22px;line-height:30px;margin:32px 0 16px 0;\"\u003eWhere This Module Gets Used\u003c\/h2\u003e\n\n\u003cul style=\"font-family:Arial,Helvetica,sans-serif;color:#333333;font-size:15px;line-height:24px;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Power LED Lighting:\u003c\/strong\u003e Driving 12V LED strips or COB LEDs from a 24V or 36V DC bus, with adjustable brightness via output voltage trimming\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Charging:\u003c\/strong\u003e CC\/CV charging of lithium or lead-acid battery packs when paired with an external charge controller\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDC Motor Speed Control:\u003c\/strong\u003e Variable voltage supply for brushed DC motors in DIY CNC spindles, pumps, and fans\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBench Power Supply:\u003c\/strong\u003e Building a regulated lab power supply from an old laptop brick or server PSU\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVehicle Electronics:\u003c\/strong\u003e Powering 12V accessories (radios, displays, chargers) from a 24V truck or marine electrical system\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSolar Regulation:\u003c\/strong\u003e Stepping down solar panel output to charge a battery at a controlled voltage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:22px;line-height:30px;margin:32px 0 16px 0;\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:17px;line-height:26px;margin:24px 0 8px 0;\"\u003eHow hot will this module get at full 20A load?\u003c\/h3\u003e\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#333333;font-size:15px;line-height:24px;margin:0 0 16px 0;\"\u003eAt full rated current, the heatsink will reach temperatures that are uncomfortable to touch — typically 60-85°C depending on input-output differential and airflow. This is normal for a switching converter operating near its limit, but it does mean you should ensure free air movement around the module and avoid mounting it against heat-sensitive components or plastic enclosures. If you need to run at 20A continuously, add forced-air cooling.\u003c\/p\u003e\n\n\u003ch3 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:17px;line-height:26px;margin:24px 0 8px 0;\"\u003eCan I connect multiple of these in parallel for more current?\u003c\/h3\u003e\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#333333;font-size:15px;line-height:24px;margin:0 0 16px 0;\"\u003eDirect paralleling of buck converter outputs is not recommended — the modules will not share current evenly, and the one with the slightly higher setpoint will carry most of the load until it hits its current limit or overheats. For higher current, either use a single larger converter rated for your total load, or implement active current-sharing circuitry with each module having its own ballast resistance and feedback trimming.\u003c\/p\u003e\n\n\u003ch3 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:17px;line-height:26px;margin:24px 0 8px 0;\"\u003eWhat happens if my input voltage drops below the set output voltage?\u003c\/h3\u003e\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#333333;font-size:15px;line-height:24px;margin:0 0 16px 0;\"\u003eA buck converter cannot boost — when the input falls below the set output voltage, the output will track the input minus a small dropout voltage (typically 1-2V lost across the switching MOSFET and inductor resistance). The module will not be damaged, but your load will see a falling voltage. For applications where the input may dip below the required output, consider a buck-boost topology instead.\u003c\/p\u003e\n\n\u003ch3 style=\"font-family:Arial,Helvetica,sans-serif;color:#111111;font-size:17px;line-height:26px;margin:24px 0 8px 0;\"\u003eDo I need to add external capacitors on the input or output?\u003c\/h3\u003e\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#333333;font-size:15px;line-height:24px;margin:0 0 16px 0;\"\u003eThe module includes onboard input and output filtering capacitors sized for most applications. However, if your input wiring is longer than about 30cm, add a low-ESR electrolytic capacitor (say 470-1000μF) right at the module input terminals to suppress input ripple and prevent voltage ringing on the supply leads. Similarly, if your load has sharp current transients, additional output capacitance can help stabilize the output during load steps.\u003c\/p\u003e\n\n\u003cdiv style=\"background-color:#16c8c8;padding:24px 32px;margin:32px 0;text-align:center;font-family:Arial,Helvetica,sans-serif;border-radius:4px;\"\u003e\n  \u003ch3 style=\"margin:0 0 12px 0;color:#ffffff;font-size:20px;line-height:28px;\"\u003eNeed this converter or building a power supply project?\u003c\/h3\u003e\n  \u003cp style=\"margin:0 0 16px 0;color:#ffffff;font-size:15px;line-height:22px;\"\u003eSend your parts list to \u003cstrong\u003eMoritta@KOEED.COM\u003c\/strong\u003e and we will confirm availability and pricing within 24 hours.\u003c\/p\u003e\n  \u003ca href=\"mailto:Moritta@KOEED.COM?subject=RFQ%20%E2%80%94%20DC-DC%20Step%20Down%20Converter%2020A\" style=\"display:inline-block;background-color:#ffffff;color:#0056B3;padding:12px 24px;text-decoration:none;font-weight:bold;border-radius:4px;font-size:15px;\"\u003eRequest a Quote →\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:1px solid #0056B3;padding:16px 24px;margin:16px 0;text-align:left;font-family:Arial,Helvetica,sans-serif;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 8px 0;color:#111111;font-size:15px;line-height:22px;\"\u003eLooking for other power supply modules or DC-DC converters?\u003c\/p\u003e\n  \u003ca href=\"https:\/\/koeed.com\/collections\" style=\"display:inline-block;color:#0056B3;padding:6px 18px;text-decoration:none;font-weight:bold;border:1px solid #0056B3;border-radius:4px;font-size:14px;\"\u003eBrowse Power Components →\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:1px solid #eeeeee;background-color:#f4fcfc;padding:16px 24px;margin:16px 0;font-family:Arial,Helvetica,sans-serif;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 4px 0;color:#111111;font-size:15px;font-weight:bold;\"\u003e\u0026gt; Need to calculate analog scaling or convert hex values?\u003c\/p\u003e\n  \u003cp style=\"margin:0 0 8px 0;color:#333333;font-size:14px;\"\u003eTry the free KOEED online PLC engineering tools.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/koeed.com\/pages\/plc-analog-calculator\" style=\"color:#0056B3;text-decoration:underline;font-weight:bold;font-size:14px;\"\u003eOpen PLC Tools\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;color:#555555;font-size:13px;line-height:20px;margin:24px 0 8px 0;\"\u003e\u003cem\u003ekoeed.com — Your Trusted PLC Supplier. Industrial electronics, automation components, and specialty parts. Worldwide shipping with 24-hour quote turnaround at Moritta@KOEED.COM.\u003c\/em\u003e\u003c\/p\u003e","brand":"KOEED","offers":[{"title":"Default Title","offer_id":47432194752697,"sku":"298397911542","price":30.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/8476\/7929\/files\/1_56461344-ef24-4f64-a4c0-e234a89f7dd3.webp?v=1783336859","url":"https:\/\/koeed.com\/products\/dc-dc-step-down-converter-20a-power-adjustable-step-down-power-supply-module","provider":"KOEED","version":"1.0","type":"link"}