Switch-Mode Power Supply Capacitor Solution
Application
Description
Complete capacitor solution for SMPS applications from 50W to 500W with optimized performance and reliability.
Core Advantages
Recommended Bill of Materials (BOM)
| Item | Part Number | Description | Quantity | Datasheet |
|---|---|---|---|---|
| 1 | RS-100uF-400V | Radial capacitor 100uF 400V for input filtering | 1 | 📄 Download |
| 2 | HP-10000uF-400V | Snap-in capacitor 10000uF 400V for high-power PFC | 1 | 📄 Download |
| 3 | HM-4700uF-200V | Snap-in capacitor 4700uF 200V for medium-power PFC | 1 | 📄 Download |
| 4 | RS-1000uF-25V | Radial capacitor 1000uF 25V for 5V output | 2 | 📄 Download |
| 5 | RS-470uF-50V | Radial capacitor 470uF 50V for 12V/24V output | 2 | 📄 Download |
| 6 | VT-47uF-35V | SMD capacitor 47uF 35V for auxiliary supply | 1 | 📄 Download |
Applications
Technical Specifications
Customer Success Stories
|
Challenge
250W medical power supply required high-reliability capacitors with 5-year warranty
Solution
Implemented HP series capacitors with conservative derating and full traceability
Results
|
Challenge
120W DIN rail power supplies for factory automation required wide temperature operation
Solution
Selected HM series capacitors with -25°C to +105°C temperature range
Results
FAE Expert Insights
Senior FAE
Applications Engineer
10+ years
Professional Insights
SMPS capacitor selection requires understanding the specific topology and operating conditions. For flyback converters, the output capacitor sees high ripple current at the switching frequency - size for RMS ripple, not just average. For PFC circuits, the output capacitor handles both line frequency ripple (100/120Hz) and high-frequency switching ripple. The combined stress is often underestimated. My recommendation: use the HP series for PFC outputs in supplies above 150W, and HM series for cost-sensitive applications below 150W. For output capacitors, always verify the ESR at your switching frequency - datasheet values are typically at 100/120Hz, but ESR can be significantly lower at higher frequencies.
Key Takeaways
- Size flyback output capacitors for RMS ripple current
- PFC output capacitors handle combined line and switching ripple
- Use HP series for PFC above 150W, HM below 150W
- Verify ESR at actual switching frequency
Decision Framework
SMPS Capacitor Selection
Steps:
- Identify power supply topology and power level
- Calculate input capacitor surge current requirements
- Size PFC output capacitor for combined ripple stress
- Select output capacitors based on RMS ripple current
- Verify ESR at actual switching frequency
- Apply voltage and temperature derating for reliability