10.5-60V to 0-45V, 400W CC/CV Buck Converter, step-down

DC-DC 400W High-Power Buck Constant Voltage Constant Current

Adjustable Power Supply Module Battery Charger LED Driver

Product Features

• Wide 10-60V input voltage, compatible with most power sources on the market as input.

• High output power, with good ventilation and natural heat dissipation, can reach 280W/12A (Note: There are output power and current limitations).

• Module uses synchronous rectification, extremely high efficiency, efficiency above 97%-96% when output voltage is above 10V.

• Constant Current indicator when charging batteries. Charging status is clear at a glance.

• Input has a 15A fuse; reverse connection of input terminals will not damage the power supply (will blow the fuse, fuse needs replacement).

Product Parameters

• Product Model: SZ-BK0612

• Module Name: 400W Buck Constant Voltage Constant Current

• Module Type: Non-isolated Buck Module (BUCK)

• Input Voltage: 10.5-60V

• Output Voltage Range: 0-45V (Must meet buck condition: Input multiplied by 0.8)

• Minimum Output Voltage: 0V (+1V)

• Maximum Output Voltage: Approx. Input * 0.8 (e.g., Input 40V * 0.8 = 32V max output, actual might be slightly higher, ~34V/35V)

• Output Constant Current: 0.2-15A (Continuously adjustable, strengthen heat dissipation if over 12A)

• Maximum Output Power: 400W (Requires adding a fan for forced cooling of heatsink and magnetic core)

• Continuous Max Operating Power: 280W (in ventilated environment)

• Continuous Max Operating Current: 12A (in ventilated environment)

• Input Undervoltage Protection: Yes (Output disabled below ~10.5V, approx. 0.5V error)

• Input Overvoltage Protection: No (Overvoltage prohibited)

• Operating Temperature: -10 to +85°C (Strengthen heat dissipation when exceeding 65°C)

• Operating Frequency: 100KHz

• Conversion Efficiency: Up to 97% (Efficiency depends on input/output voltage and current)

• Short Circuit Protection: Yes (Constant Current protection)

• Input Reverse Polarity Protection: Yes (Input reverse connection will blow the input fuse)

• Output Reverse Current Protection: No (When charging batteries or connecting inductive loads like motors, an external reverse-blocking diode is required)

• Power Indicator: Yes (Blue LED)

• Constant Current Indicator: Yes (CC indicator red LED on the small board lights up during CC operation, no current output; off during CV)

• Connection: Built-in solder-free 25A terminal block

• Module Dimensions: Length 60mm x Width 60mm x Height 45mm

• Weight: 177g; with packaging 210g.

• Packaging: Individual cardboard box.

• Note: "Input/IN" is input. "Output/OUT".

Important Notes

• Input +/- and Output +/- strictly prohibited from reverse connection (Input reverse connection blows fuse, Output reverse connection damages control board, which is unrepairable and must be replaced).

• The control board has some waterproof glue; if damaged, it can only be replaced. Consider before purchasing.

• When charging batteries or connecting inductive loads, an external reverse-blocking diode must be added to the output.

• Voltage & Current Adjustment Method: (Requires multimeter and flathead screwdriver)

  • Voltage Adjustment: Rotate the "CV" potentiometer on the main board clockwise to increase, counterclockwise to decrease, according to required voltage.

  • Output Current Adjustment: Set multimeter to 20A or 10A current range. Set this supply's voltage to 5V. Turn the "CC" potentiometer counterclockwise ~20 turns (min current). Short the output with the multimeter. Then, rotate the "CC" potentiometer clockwise to adjust to the required current value. (Note: After turning CC pot counterclockwise, output voltage may disappear because current is set to 0A. Ignore this, output returns when current is increased clockwise).

• Module uses low-side current sensing. Do NOT directly short the input negative and output negative with a wire. Shorting the negatives disables constant current, potentially damaging the supply and the device requiring CC.

• This is a buck converter; it can only step down voltage, not boost. Input voltage must be higher than output voltage.