{"product_id":"dc-dc-400w-buck-step-down-constant-voltage-current-power-module","title":"DC-DC 400W Buck Power Module – Adjustable CV CC | GUANDO","description":"\n\u003ch2\u003eGUANDO 400W DC-DC Step-Down Buck Power Module — Adjustable Voltage \u0026amp; Current\u003c\/h2\u003e\n\u003cp\u003eMeet the \u003cstrong\u003eGUANDO SZ-BK0612\u003c\/strong\u003e — a high-efficiency, 400W non-isolated BUCK (step-down) power module designed for makers, engineers, and electronics enthusiasts. Whether you need a reliable bench power supply, a battery charging solution, or an LED driver, this compact module delivers continuously adjustable voltage and current with impressive efficiency. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Input Range:\u003c\/strong\u003e Accepts 10.5V–60V DC input, compatible with most common power supplies on the market.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustable Output:\u003c\/strong\u003e Continuously adjustable output voltage (0–45V) and current (0.2–15A) to suit virtually any load requirement.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Efficiency:\u003c\/strong\u003e Step-rectifier design achieves up to 92–97% conversion efficiency depending on input\/output conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Output Power:\u003c\/strong\u003e Up to 400W peak (with forced cooling); 280W \/ 12A maximum continuous output in a well-ventilated environment.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConstant Voltage \u0026amp; Constant Current (CV\/CC):\u003c\/strong\u003e Dual-mode operation with a dedicated red CC indicator light that illuminates during constant-current operation for at-a-glance status monitoring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in Protections:\u003c\/strong\u003e Input undervoltage protection (auto-shuts output below ~10.5V), input reverse-polarity fuse protection (15A fuse), and short-circuit protection via constant-current limiting.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Connections:\u003c\/strong\u003e Built-in 25A screw terminal block — no soldering required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStatus Indicator:\u003c\/strong\u003e Blue LED working indicator light confirms the module is active.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003eSZ-BK0612\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003eNon-Isolated BUCK (Step-Down)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e10.5V – 60V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eOutput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e0V (+1V) – ~Input × 0.8 (max 45V)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eOutput Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e0.2A – 15A (continuously adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003ePeak Output Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e400W (forced cooling required)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eContinuous Output Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e280W \/ 12A (ventilated environment)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eConversion Efficiency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003eUp to 97%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eWorking Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e100 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e-10°C to +85°C (add cooling above 65°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eInput Fuse\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e15A (replaceable)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eConnection Terminal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003eBuilt-in 25A screw terminal (no soldering)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eModule Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e60mm × 60mm × 45mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eNet Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e170g (packaged: ~180g)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px;\"\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow to Adjust Voltage \u0026amp; Current\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eVoltage Adjustment:\u003c\/strong\u003e Use a flat-head screwdriver to turn the \u003cem\u003eCV (blue)\u003c\/em\u003e potentiometer on the module. Rotate \u003cstrong\u003eclockwise\u003c\/strong\u003e to increase voltage and \u003cstrong\u003ecounter-clockwise\u003c\/strong\u003e to decrease it. Monitor with a multimeter for precision.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCurrent Adjustment:\u003c\/strong\u003e Set your multimeter to the 10A or 20A current range. Set output voltage to ~5V, then turn the \u003cem\u003eCC (blue)\u003c\/em\u003e potentiometer fully counter-clockwise (~20 turns) to bring current to minimum. Short-circuit the output terminals through the multimeter, then rotate the CC potentiometer clockwise until the desired current value is reached. \u003cem\u003eNote:\u003c\/em\u003e If the module shows no output after turning CC fully counter-clockwise, this is normal — current is set to 0A. Simply rotate clockwise to restore output.\u003c\/p\u003e\n\n\u003ch3\u003eImportant Safety Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eThis is a \u003cstrong\u003estep-down (buck) only\u003c\/strong\u003e module — input voltage MUST always be higher than output voltage.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNever reverse-connect\u003c\/strong\u003e input or output terminals. Reverse input will blow the input fuse; reverse output will damage the control board beyond repair.\u003c\/li\u003e\n  \u003cli\u003eWhen charging batteries or driving inductive loads (e.g., motors), add an \u003cstrong\u003eanti-backfeed diode\u003c\/strong\u003e on the output.\u003c\/li\u003e\n  \u003cli\u003eDo NOT short-circuit the input negative and output negative poles directly — this bypasses constant-current detection and can damage the module and connected load.\u003c\/li\u003e\n  \u003cli\u003eFor continuous operation above 280W or 12A, add forced cooling (a fan on the heatsink and magnetic ring).\u003c\/li\u003e\n  \u003cli\u003eThe control board has weather-resistant conformal coating — avoid physical impact or dropping.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the maximum output power of the DC-DC 400W buck power module?\u003c\/h4\u003e\n\u003cp\u003eA: The module can deliver up to 400W peak output power, but this requires active forced cooling (a fan on the heatsink and magnetic ring). In a naturally ventilated environment, the maximum continuous output power is 280W at up to 12A. Exceeding these limits without proper cooling may damage the module.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can this step-down module be used to charge lithium or lead-acid batteries?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — the CV\/CC (constant voltage \/ constant current) dual-mode operation makes this module well suited for charging batteries. The red CC indicator light turns on during constant-current charging so you can monitor charging status at a glance. However, you must add an anti-backfeed diode on the output when the module is connected to a battery to prevent reverse current flow.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What input voltage range does this buck module support?\u003c\/h4\u003e\n\u003cp\u003eA: The module accepts a wide input range of 10.5V to 60V DC, making it compatible with most common bench power supplies, solar panels, and other DC sources available on the market. The output voltage can be set from near 0V up to approximately 80% of the input voltage (maximum 45V).\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is soldering required to connect this power module?\u003c\/h4\u003e\n\u003cp\u003eA: No soldering is needed. The module features a built-in 25A screw terminal block for both input and output connections, making setup quick and tool-minimal — just a flat-head screwdriver for the terminals and potentiometer adjustments.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the maximum output power of the DC-DC 400W buck power module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The module can deliver up to 400W peak output power, but this requires active forced cooling (a fan on the heatsink and magnetic ring). In a naturally ventilated environment, the maximum continuous output power is 280W at up to 12A. Exceeding these limits without proper cooling may damage the module.\"}}, {\"@type\": \"Question\", \"name\": \"Can this step-down module be used to charge lithium or lead-acid batteries?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes — the CV\/CC (constant voltage \/ constant current) dual-mode operation makes this module well suited for charging batteries. The red CC indicator light turns on during constant-current charging so you can monitor charging status at a glance. However, you must add an anti-backfeed diode on the output when the module is connected to a battery to prevent reverse current flow.\"}}, {\"@type\": \"Question\", \"name\": \"What input voltage range does this buck module support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The module accepts a wide input range of 10.5V to 60V DC, making it compatible with most common bench power supplies, solar panels, and other DC sources available on the market. 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