ZK-4KX CNC Buck Boost Converter 4A 35W - Adjustable DC-DC 0.6-36V Power Module with LCD

Specifications:

• Type: Non-isolated Automatic Buck-Boost (Step-up/Step-down)
  
• Input Voltage: DC 5.0V - 30V
  
• Output Voltage: DC 0.6V - 36V
  
• Output Current: 0 - 4.0A (Continuous)
  
• Output Power: 35W (Standard) | 50W (With enhanced cooling)
  
• Voltage Resolution: 0.01V
  
• Current Resolution: 0.001A
  
• Conversion Efficiency: Approximately 88%
  
• Display: Multifunction Blue-Backlit LCD
  
• Protections: Input Anti-reverse, Output Anti-backflow, OVP, OCP, OPP, OTP, LVP.
  
• Dimensions: 79mm x 43mm x 42mm

Key Applications

• Solar Battery Charging: Perfectly regulates fluctuating solar panel output to charge 12V or 24V batteries with Constant Current (CC) mode.
  
• DIY Bench Power Supply: Transform any old laptop adapter into a high-precision laboratory power source.
  
• LED Driver: Precise current control for high-power LED arrays.
  
• Automotive Electronics: Stable 12V output for dashcams or infotainment systems from a fluctuating car battery (8V-14V).

Project Evolution

• Past Projects (Prerequisites): If you've previously used LM2596 or XL6009 modules with tiny brass trim-pots, you know how hard it is to dial in a precise 3.30V.
  
• Feature Upgrade: The ZK-4KX upgrades you to CNC digital control. No more screw-drivers; just turn the encoder for 0.01V precision. The built-in protection logic means you no longer need external fuses for most low-power R&D work.
  
• Effort/Requirements: Beginner-Friendly. Features easy-to-use screw terminals and an intuitive menu system.

Virtual Technician & Wiring

• ⚠️ SAFETY WARNING: While this module has anti-reverse protection, always double-check polarity. For continuous operation at 4A or 35W+, ensure adequate airflow across the rear heatsink.
  
• VIN+ / VIN-: Connect your DC input source (e.g., 12V Adapter or Solar Panel).
  
• OUT+ / OUT-: Connect to your Load or Battery.
  
• CC/CV Adjustment: Short-press the 'SW' button to toggle display; long-press the rotary encoder to enter setting mode.
  
• Battery Charging: Set your target voltage first, then set the max charging current. The "Anti-backflow" feature means you don't need a diode for battery charging!

Package Included:

1 x ZK-4KX CNC Buck Boost Converter 4A 35W - Adjustable DC-DC 0.6-36V Power Module with LCD

Frequently Asked Questions (FAQ)

1. What is the difference between Buck and Boost?
   Buck reduces voltage, while Boost increases it. This ZK-4KX does both automatically to maintain a steady output.
2. Can I use this to charge a 12V Lead Acid battery?
   Yes. Use the Constant Current (CC) mode to set the charging rate and Constant Voltage (CV) for the float voltage.
3. Does it need a separate diode for battery charging?
   No. It has built-in anti-backflow protection to prevent the battery from discharging back into the module.
4. What happens if I short-circuit the output?
   The module will enter Over-Current Protection (OCP) mode and cut off the output to prevent damage.
5. Can I power this from a 5V USB port?
   Yes, but since the input current is limited, you won't be able to draw high power (35W) from the output.
6. What is the "OPP" protection?
   Over-Power Protection. It limits the total wattage (35W) to prevent the components from overheating.
7. How do I set the Constant Current (CC) limit?
   Long-press the rotary encoder, navigate to the current setting (A), and dial in your desired limit.
8. Is the display visible in the dark?
   Yes, it features a clear, backlit LCD display.
9. Can I use this for 24V industrial sensors?
   Yes, it provides very stable output, which is Probots™ Logic-Safe ????️ for sensitive industrial electronics.
10. What is the maximum input voltage?
    The absolute maximum input is 30V DC. Do not exceed this.
11. Does it remember my settings after power-off?
    Yes, all voltage and current settings are saved in non-volatile memory.
12. Why is the output voltage slightly lower than my setting?
    Check your input power source. If the source cannot provide enough current, the voltage may sag under load.
13. Can I use this as an LED driver?
    Absolutely. The Constant Current mode is ideal for driving high-power LEDs safely.
14. How do I calibrate the voltage?
    The module is factory-calibrated, but you can enter the calibration menu by holding the 'U/I' button during power-up.
15. Does it have a cooling fan?
    No, it uses a high-efficiency heatsink. For 50W loads, an external fan is recommended.
16. Can it handle 220V AC?
    No. This is a DC-to-DC converter only. Never connect AC mains to this module.
17. What size wires should I use?
    For 4A current, we recommend 18AWG or 20AWG high-quality copper wire.
18. Can I use this for a 3.3V Raspberry Pi?
    Yes, the 0.01V resolution allows you to set a very precise 3.30V or 5.10V for SBCs.
19. What is the 'LVP' setting?
    Low Voltage Protection. It shuts off the output if your input battery (like a LiPo) drops below a certain level to prevent over-discharge.
20. Is the rotary encoder durable?
    Yes, it is a high-quality digital encoder designed for thousands of adjustments.