Selecting the right switching power supply (SPS) is essential for ensuring long-term performance, safety, and reliability in electronic systems. Making the right decision not only improves product life cycle but also minimizes risks such as overheating, failure, and power instability.
Below are key points to consider when choosing the most suitable SPS for your application:
1. Choose a Power Supply with Extra Capacity (At Least +30%)
To enhance system reliability, it is recommended to select a power supply with at least 30% higher wattage than the actual system requirement.
Example:
If your load requires 100W, choosing a 130W or higher power supply ensures stable performance, reduces thermal stress, and prolongs lifespan.
2. Consider Ambient Temperature & Cooling Conditions
Switching power supplies generate heat during operation. If the device is placed in a high-temperature environment or lacks proper ventilation, the available output power must be derated.
Manufacturers provide derating curves showing the relationship between temperature and output power — always refer to these charts in the product datasheet to avoid overheating or failure.
3. Select Functions Based on Application Needs
Different applications may require different features. Depending on your design, consider the following:
Protection Functions
- OVP – Over Voltage Protection
- OTP – Over Temperature Protection
- OLP – Over Load Protection
Application Functions
- Power Good / Power Fail signals
- Remote control
- Remote sensing
Special Features
- Power Factor Correction (PFC)
- UPS (Uninterruptible Power Supply) capability
Choosing the right feature set ensures stability, system compatibility, and smarter power operation.
4. Check Safety Standards & EMC Compliance
Before finalizing a power supply model, confirm that it meets the required:
- Safety certifications
- EMC/EMI regulations
Compliance ensures safe usage, reduces risk to equipment and users, and is required for most commercial products.
Summary
A well-selected switching power supply delivers higher reliability, better efficiency, and safer operation. Always evaluate power margin, thermal conditions, required functions, and certification compliance before deciding — doing so will significantly improve system performance and longevity.
