Summary of +/-18V ISOLATED DC-DC CONVERTER DUAL SUPPLY OUTPUT FROM USB 5V POWER INPUT
This article describes a compact, high-efficiency DC-DC converter that generates dual +/-18V outputs from a single 5V USB or DC supply. Utilizing the SN6501 chip, it ensures high isolation to prevent ground loops and noise. The board also provides non-isolated 3.3V and 5V outputs, making it ideal for testing industrial and scientific modules in small spaces.
Parts used in the Mini Dual Output DC-DC Converter:
- SN6501 chip (oscillator/power-driver)
- Low profile center-tapped transformer
- D2 power LED
- CN1 USB A type connector
- CN2 unregulated dual 18V Output terminals
- CN3 non-isolated 3.3V and 5V DC output terminals
- PCB (37.15 x 15.56 mm)
This is a mini DC-DC converter with dual output from single 5V DC supply or USB power source (e.g., +/-18V from 5V/USB). The mini board will fit into small space and perform with high efficiency. Basically, the circuit transfers power from 5V/USB to the output side +/-18V with high isolation, without a direct connection between 5V/USB power and output. The power isolation prevents ground loops and provides high noise immunity between input and output. The project is based on SN6501 chip, which is oscillator/power-driver, is specifically designed for small factor devices. The device drives a low profile, center-tapped transformer primary from 5V/USB power and secondary side provides unregulated dual output which can be further regulated as per requirement (e.g., +/-5V, +/-12V). Project is a very easy and simple tool to test and run industrial, scientific project, PLC and I/O modules which require dual output from single input. D2 power LED, CN1 USB A type connector for USB power input, CN3 No isolated 3.3V and 5V DC output, CN2 unregulated dual 18V Output.
This is a mini DC-DC converter with dual output from single 5V DC supply or USB power source (e.g., +/-18V from 5V/USB). The mini board will fit into small space and perform with high efficiency. Basically, the circuit transfers power from 5V/USB to the output side +/-18V with high isolation, without a direct connection between 5V/USB power and output. The power isolation prevents ground loops and provides high noise immunity between input and output. The project is based on SN6501 chip, which is oscillator/power-driver, is specifically designed for small factor devices. The device drives a low profile, center-tapped transformer primary from 5V/USB power and secondary side provides unregulated dual output which can be further regulated as per requirement (e.g., +/-5V, +/-12V). Project is a very easy and simple tool to test and run industrial, scientific project, PLC and I/O modules which require dual output from single input. D2 power LED, CN1 USB A type connector for USB power input, CN3 No isolated 3.3V and 5V DC output, CN2 unregulated dual 18V Output.
FEATURES
- Input 5V DC @ 500mA (Power supply or USB Power)
- Output Unregulated +/-18V DC
- Output current 80mA (40mA + 40mA)
- Output 3.3V DC @ 150mA Non-Isolated LDO
- Output 5V DC @ 200mA Non-Isolated
- PCB Dimensions 37.15 x 15.56 mm
Read more: +/-18V ISOLATED DC-DC CONVERTER DUAL SUPPLY OUTPUT FROM USB 5V POWER INPUT
- How does the circuit handle power isolation?
The circuit transfers power with high isolation without a direct connection between the 5V/USB input and the output side. - What is the primary function of the SN6501 chip?
The SN6501 acts as an oscillator and power driver specifically designed for small factor devices. - Can the output voltage be adjusted after conversion?
Yes, the unregulated dual output can be further regulated to requirements like +/-5V or +/-12V. - What are the dimensions of the PCB?
The PCB dimensions are 37.15 x 15.56 mm. - Does the project support USB power input?
Yes, it accepts 5V DC from a power supply or a USB power source. - What is the current capacity of the unregulated dual output?
The output current is 80mA total, split into 40mA for each rail. - Are there any non-isolated outputs provided on the board?
Yes, it includes a non-isolated 3.3V DC output at 150mA and a 5V DC output at 200mA. - Why is power isolation important in this design?
Power isolation prevents ground loops and provides high noise immunity between the input and output.
