DC 9V-120V to 12V 3A Step Down Buck Converter - High Voltage Power Module

Specifications

• Input Voltage Range: 9V to 120V DC.

• Output Voltage: Fixed 12V DC.

• Output Current: 3A (Max).

• Output Power: 36W.

• Efficiency: Up to 92%.

• Switching Frequency: 140kHz.

• Protection: Short circuit protection, over-current protection, and over-temperature protection.

• Operating Temperature: -40°C to +85°C.

• Dimensions: 42mm x 30mm x 17mm.

Key Applications & Projects

• E-Bike Lighting: Powering 12V LED headlights and tail-lights from 48V/60V/72V batteries.

• EV Horns & GPS: Running standard car accessories on electric scooters or bikes.

• Industrial Automation: Stepping down high-voltage DC bus lines for sensor and control logic.

• Solar Power Systems: Regulating 24V or 48V solar arrays down to 12V for accessory use.

Project Evolution

• Past Projects (Prerequisites): If you've used the LM2596 and realised its 40V limit is too low for your 60V battery, you’re ready for this.

• Feature Upgrade: This module unlocks High-Voltage Resilience. You no longer need to worry about blowing up your regulator during a battery charge cycle where voltages can reach 84V or higher.

• Effort/Requirements: Beginner. No adjustments needed—it is a fixed 12V output. Simply solder your input and output wires.

Virtual Technician & Wiring

⚠️ Safety Warning: You are working with high-voltage DC. Ensure your battery is disconnected before soldering. Use high-quality wire (minimum 20 AWG) for 3A loads.

Package Includes: 1 x DC 9V-120V to 12V 3A Step Down Buck Converter

Frequently Asked Questions (FAQ)

• Can I use this on a 72V E-Bike? Yes, it is perfect for 72V systems (which peak at ~84V).
• Does the output voltage change with the input? No, the output remains a stable 12V even if the input fluctuates between 20V and 120V.
• Does it need a separate heatsink? No, the included heatsink is sufficient for a 3A load.
• Can I charge a phone with this? Yes, if you connect a 12V-to-USB adapter to the output.
• What happens if I short the output? The module has built-in short circuit protection and will shut down to prevent damage.
• Is it waterproof? No, it must be mounted inside a weatherproof enclosure for outdoor use.
• Can I run a 12V motor with this? Yes, as long as the motor's peak current doesn't exceed 3A.
• Is the output adjustable? No, this is a fixed 12V version for maximum stability.
• What is the minimum input voltage? 9V, but for a stable 12V output, we recommend an input of at least 15V.
• Can I use it on a 96V system? Yes, it handles up to 120V comfortably.
• Does it get hot? It gets warm at 3A. Ensure there is some airflow in your enclosure.
• Can I parallel two for 6A? Not recommended; use our PRO3571 10A version instead.
• Will it drain my battery when not in use? The idle current is very low (~5mA), but we recommend a master switch for long-term storage.
• Is it isolated? No, this is a common-ground buck converter.
• What is the efficiency? Approximately 90-92% depending on the load.
• Can I use it for 24V input? Yes, it works perfectly with 24V inputs.
• Is it protected against reverse polarity? No; reversing the input wires will damage the module.
• Can I use it as a LED driver? Yes, it is excellent for 12V LED strips.
• What is the switching frequency? 140kHz, which minimizes electrical noise.
• Is it verified for high-voltage peaks? Yes, we've tested this specifically for the voltage spikes found in EV systems.