High Power Adjustable Buck Power Supply Module DC-DC Step Down Converter Wide Input Voltage Regulator Board

🔧 Adjustable Buck Power Supply Module

✨ Core Advantages

✅ Well-crafted circuit layout ✅ High voltage & current adjustment accuracy ✅ Stable long-running performance ✅ Built-in large heat sink for heat dissipation ✅ Large toroidal inductor + high-capacity filter capacitors ✅ Dual potentiometers for voltage/current independent regulation ✅ Blue LCD digital display for real-time voltage monitoring ✅ Short-circuit protection built-in

📋 Product Specifications

• Input Voltage: 7V-40V
• Output Voltage: 1.5V-35V continuously adjustable Note: Only works as buck module; input voltage must be ≥1.5V higher than output voltage
• Output Current: Max 10A, recommended operating current ≤8A
• Output Power: Max 150W, recommended working power ≤100W; reduce power when input-output voltage difference is large
• Operating Temperature: -40℃ ~ +85℃
• Operating Frequency: 300 kHz
• Conversion Efficiency: Up to 95%
• Protection Function: Short Circuit Protection
• Function Exclusion: No reverse input protection, no output anti-backflow
• Mounting: Fixed by 8pcs 3mm screws
• Wiring: Terminal block connection or soldering; VIN = input, Vout = output

📺 LCD Display Modes

3 switchable display modes controlled by SET button:

1. F-0 Mode: Only display output voltage (OUT)
2. F-1 Mode: Only display input voltage (IN)
3. F-2 Mode: Alternately cycle input & output voltage display Operation Guide:
4. Press SET key to loop 3 display modes, corresponding indicator lights toggle on/off
5. Press OK/Confirm key to save settings and exit setup menu
6. Single press OK key to turn LCD backlight on / off

⚙️ Calibration Operation Guide

Voltage Calibration Steps

1. Cut off power supply, hold down SET button, then power on the module to enter calibration mode (LCD screen flashes)
2. Release SET button: Press SET to increase voltage value, press OK to decrease value
3. Adjust screen value to match actual input voltage (e.g. real input 12.65V → set display to 12.65V)
4. Auto save after 2 seconds, power off to exit calibration (only calibrate once at first use)

⚠️ Special Usage Note

New users may fail to adjust output voltage after receiving the module: factory default output voltage is ~20V. Rotate ADJ-V potentiometer counterclockwise for more than 10 full turns until voltage value changes, then voltage regulation works normally.

🛠 3 Main Application Scenarios

1. Overcurrent Protected Step-down Power Supply

Constant current mode activates only when actual load current exceeds preset value; otherwise constant voltage mode runs. Constant current function only works when output voltage ≥2V. Operation Steps:

1. No-load status: Turn ADJ-V potentiometer to set target output voltage
2. Short output terminals with thick wire/tweezers (do not adjust voltage during short circuit), turn ADJ-I potentiometer to set overcurrent protection threshold; red constant current indicator lights when current hits limit
3. Connect load and start operation

2. Lithium Battery Charger

Constant current + constant voltage charging mode, with charging full indicator light Operation Steps:

1. Confirm battery float voltage & charging current (e.g. 3.7V 2200mAh lithium cell: float voltage 4.2V, max charge current 2.2A)
2. No-load: Adjust ADJ-V to match battery float voltage
3. Short output terminals, adjust ADJ-I to set target charging current
4. Factory default charging complete threshold: 0.1× preset charging current. Yellow charging light off, blue full-charge light on when current drops below threshold
5. ⚠️ Critical Safety Tip: Disconnect battery first, then cut input power after charging to avoid reverse current damage

3. Constant Current LED Driver

Operation Steps:

1. Confirm LED rated working voltage & operating current
2. No-load: Adjust ADJ-V to match LED working voltage
3. Short output terminals, adjust ADJ-I to set LED constant driving current
4. Connect LED light string and power on

📝 General Operation Instructions

1. Read full manual & operation guide before wiring and power-on test
2. All modules pass factory power-on aging test before shipment
3. Confirm wiring definition before power supply; solder terminals only after verification
4. Warranty Exclusion: Damage caused by wrong wiring, improper use or DIY modification is not covered