🔋 5A DC-DC CC/CV Buck Converter — Adjustable 4–38V to 1.25–36V Step-Down Module
Compact DC-DC step-down power module designed for adjustable constant voltage (CV) and constant current (CC) operation. This board is ideal for battery charging, high-power LED driving, DIY bench power projects, and general low-voltage DC regulation where you need controllable output voltage and current in one compact module.
It is a practical solution for users who want a flexible buck converter that can work as a regulated power module, a battery charger for compatible chemistries, or a constant-current LED driver.
🔧 Key Features
⚡ CC / CV Operation: supports both constant current and constant voltage modes
📉 Step-Down Design: reduces a higher DC input voltage to a lower adjustable output voltage
🎛️ Fully Adjustable Output: voltage and current can be set with onboard potentiometers
🔋 Battery Charger Ready: suitable for lithium-ion, NiCd, NiMH, and other compatible battery packs when configured correctly
💡 LED Driver Function: can be used as a high-power LED constant-current driver
🟢🔴 Status Indicators: visual indication for constant-current / constant-voltage behavior and charging status logic
🚀 High Efficiency: up to 96% under suitable conditions
🛡️ Built-In Protection: short-circuit current limiting and over-temperature shutdown
🆚 How This Module Can Be Used
As a General DC Power Module
Use when: You need an adjustable DC output with current limiting / overcurrent behavior for testing or powering a load.
Why pick it: Good for DIY electronics where you want controllable voltage and current in one small board.
As a Battery Charger
Use when: You know the correct float voltage and charging current for your battery and want a low-cost CC/CV charger solution.
Why pick it: Strong fit for custom charging projects where different chemistries or charge voltages are required.
As a High-Power LED Driver
Use when: You need a constant-current source for LEDs or similar loads with known operating voltage and current requirements.
Why pick it: Useful for high-power lighting projects when current control matters more than simple voltage supply.
⚙️ Shared Features
Module Type: DC-DC buck converter with CC/CV control
Control Method: onboard voltage and current trimmers
Applications: charger, LED driver, regulated DC source
Protection: current limiting and thermal shutdown
Mounting: 4 × 3 mm screw holes
Connection Style: screw terminal or solder terminal pads
📐 Key Specifications
Input Voltage: 4–38V DC
Output Voltage: 1.25–36V DC adjustable
Output Current: up to 5A adjustable
Output Power: up to 75W
Working Temperature: -40°C to +85°C
Operating Frequency: 180KHz
Conversion Efficiency: up to 96%
Short Circuit Protection: yes, current-limited around 8A
Over-Temperature Protection: yes, automatic output shutdown when overheated
Reverse Input Protection: No
Module Dimensions: approx. 51.2 × 26.2 × 15 mm
Terminals: V-IN = input, V-OUT = output
🧠 Quick Selection Guide
Need a lower output voltage than your input? This buck converter is the right type.
Need a charger with adjustable voltage and current? This module is a strong fit.
Need to drive a high-power LED safely? Use the constant-current setup mode.
Need the output to be higher than the input? Choose a boost converter instead.
🔋 Battery Charging Guide
1. Determine the correct float voltage and charging current for your battery.
2. With no battery connected, adjust the voltage potentiometer until the module reaches the required final charge voltage.
3. Short the output through a meter in 10A mode and adjust the current potentiometer to the desired charge current.
4. Connect the battery only after voltage and current are set correctly.
5. During charging, current gradually drops; when it falls to about 0.1 × the set current, the charge-complete indication logic changes per the supplied spec.
💡 LED Driver Guide
1. Confirm the LED’s required operating current and maximum voltage.
2. With no LED connected, set the output voltage to the appropriate maximum level.
3. Short the output through a meter and adjust the current potentiometer to the desired LED current.
4. Connect the LED only after the settings are correct.
🧰 Typical Uses
Lithium-ion battery charging projects
NiCd / NiMH battery pack charging
High-power LED constant-current driving
DIY bench DC regulation
General step-down voltage conversion
Custom electronics power builds
🔌 Wiring & Safety
This is a step-down (buck) module, so the output voltage must be set below the input voltage.
There is no reverse input protection, so double-check polarity before applying power.
Always set the output voltage and current limit before connecting a battery, LED, or sensitive load.
For operation above about 3A and 35W, improve heat dissipation with better airflow or additional cooling.
Use proper wire gauge and secure terminations for higher-current applications.
⚠️ Important Notes
This module is a DC buck converter, not an AC power supply.
A small output voltage drop of about 0–0.3V under load can occur because of the onboard current-sense resistor; this is normal per the supplied spec.
Real continuous current depends on cooling, ambient temperature, and installation conditions.
Improper setup can damage batteries, LEDs, loads, or the module itself.
📦 Package Includes
1 × 5A DC-DC Constant Current / Voltage Regulator Module
💥 Volume Discount — Buy More & Save
• 10% OFF when you buy 2 units
• 15% OFF when you buy 3 units
• 20% OFF when you buy 4 or more units
Discount auto-applied.
🇺🇸 Premium Support & Shipping
• US Stock / Fast Shipping — 2–4 day delivery from Oklahoma, USA. Your purchase supports a US-based small business.
• 🧪 Quality Checked & Tested — spot-checked before shipping.
• 🔁 Easy Returns — 30-day returns; we pay return shipping.
• 📦 Professional Packaging — safe delivery, 100% guaranteed.
Compact DC-DC step-down power module designed for adjustable constant voltage (CV) and constant current (CC) operation. This board is ideal for battery charging, high-power LED driving, DIY bench power projects, and general low-voltage DC regulation where you need controllable output voltage and current in one compact module.
It is a practical solution for users who want a flexible buck converter that can work as a regulated power module, a battery charger for compatible chemistries, or a constant-current LED driver.
🔧 Key Features
⚡ CC / CV Operation: supports both constant current and constant voltage modes
📉 Step-Down Design: reduces a higher DC input voltage to a lower adjustable output voltage
🎛️ Fully Adjustable Output: voltage and current can be set with onboard potentiometers
🔋 Battery Charger Ready: suitable for lithium-ion, NiCd, NiMH, and other compatible battery packs when configured correctly
💡 LED Driver Function: can be used as a high-power LED constant-current driver
🟢🔴 Status Indicators: visual indication for constant-current / constant-voltage behavior and charging status logic
🚀 High Efficiency: up to 96% under suitable conditions
🛡️ Built-In Protection: short-circuit current limiting and over-temperature shutdown
🆚 How This Module Can Be Used
As a General DC Power Module
Use when: You need an adjustable DC output with current limiting / overcurrent behavior for testing or powering a load.
Why pick it: Good for DIY electronics where you want controllable voltage and current in one small board.
As a Battery Charger
Use when: You know the correct float voltage and charging current for your battery and want a low-cost CC/CV charger solution.
Why pick it: Strong fit for custom charging projects where different chemistries or charge voltages are required.
As a High-Power LED Driver
Use when: You need a constant-current source for LEDs or similar loads with known operating voltage and current requirements.
Why pick it: Useful for high-power lighting projects when current control matters more than simple voltage supply.
⚙️ Shared Features
Module Type: DC-DC buck converter with CC/CV control
Control Method: onboard voltage and current trimmers
Applications: charger, LED driver, regulated DC source
Protection: current limiting and thermal shutdown
Mounting: 4 × 3 mm screw holes
Connection Style: screw terminal or solder terminal pads
📐 Key Specifications
Input Voltage: 4–38V DC
Output Voltage: 1.25–36V DC adjustable
Output Current: up to 5A adjustable
Output Power: up to 75W
Working Temperature: -40°C to +85°C
Operating Frequency: 180KHz
Conversion Efficiency: up to 96%
Short Circuit Protection: yes, current-limited around 8A
Over-Temperature Protection: yes, automatic output shutdown when overheated
Reverse Input Protection: No
Module Dimensions: approx. 51.2 × 26.2 × 15 mm
Terminals: V-IN = input, V-OUT = output
🧠 Quick Selection Guide
Need a lower output voltage than your input? This buck converter is the right type.
Need a charger with adjustable voltage and current? This module is a strong fit.
Need to drive a high-power LED safely? Use the constant-current setup mode.
Need the output to be higher than the input? Choose a boost converter instead.
🔋 Battery Charging Guide
1. Determine the correct float voltage and charging current for your battery.
2. With no battery connected, adjust the voltage potentiometer until the module reaches the required final charge voltage.
3. Short the output through a meter in 10A mode and adjust the current potentiometer to the desired charge current.
4. Connect the battery only after voltage and current are set correctly.
5. During charging, current gradually drops; when it falls to about 0.1 × the set current, the charge-complete indication logic changes per the supplied spec.
💡 LED Driver Guide
1. Confirm the LED’s required operating current and maximum voltage.
2. With no LED connected, set the output voltage to the appropriate maximum level.
3. Short the output through a meter and adjust the current potentiometer to the desired LED current.
4. Connect the LED only after the settings are correct.
🧰 Typical Uses
Lithium-ion battery charging projects
NiCd / NiMH battery pack charging
High-power LED constant-current driving
DIY bench DC regulation
General step-down voltage conversion
Custom electronics power builds
🔌 Wiring & Safety
This is a step-down (buck) module, so the output voltage must be set below the input voltage.
There is no reverse input protection, so double-check polarity before applying power.
Always set the output voltage and current limit before connecting a battery, LED, or sensitive load.
For operation above about 3A and 35W, improve heat dissipation with better airflow or additional cooling.
Use proper wire gauge and secure terminations for higher-current applications.
⚠️ Important Notes
This module is a DC buck converter, not an AC power supply.
A small output voltage drop of about 0–0.3V under load can occur because of the onboard current-sense resistor; this is normal per the supplied spec.
Real continuous current depends on cooling, ambient temperature, and installation conditions.
Improper setup can damage batteries, LEDs, loads, or the module itself.
📦 Package Includes
1 × 5A DC-DC Constant Current / Voltage Regulator Module
💥 Volume Discount — Buy More & Save
• 10% OFF when you buy 2 units
• 15% OFF when you buy 3 units
• 20% OFF when you buy 4 or more units
Discount auto-applied.
🇺🇸 Premium Support & Shipping
• US Stock / Fast Shipping — 2–4 day delivery from Oklahoma, USA. Your purchase supports a US-based small business.
• 🧪 Quality Checked & Tested — spot-checked before shipping.
• 🔁 Easy Returns — 30-day returns; we pay return shipping.
• 📦 Professional Packaging — safe delivery, 100% guaranteed.
