DC COMMON MODE CHOKE COIL # Technical Documentation: CPFC74NPPS02H2A20
Manufacturer : SUMIDA
---
## 1. Application Scenarios
### Typical Use Cases
The CPFC74NPPS02H2A20 is a high-performance common-mode power line choke designed for electromagnetic interference (EMI) suppression in AC/DC power circuits. Key use cases include:
- Noise Filtering : Attenuates common-mode noise in switching power supplies (e.g., flyback, forward converters).
- Motor Drives : Suppresses high-frequency noise in variable-frequency drives (VFDs) and industrial motor controllers.
- Renewable Energy Systems : Integrated into solar inverters and wind turbine converters to comply with EMI standards.
### Industry Applications
- Consumer Electronics : Power adapters, LED drivers, and gaming consoles.
- Industrial Automation : PLCs, servo drives, and robotics power modules.
- Telecommunications : Base station power supplies and server racks.
- Automotive : On-board chargers (OBCs) and DC-DC converters in electric vehicles (EVs).
### Practical Advantages and Limitations
| Advantages | Limitations |
|----------------|-----------------|
| High common-mode impedance (>1 kΩ at 100 kHz) | Limited to low-frequency noise suppression (<10 MHz) |
| Compact footprint (suitable for space-constrained designs) | Saturation current constraints at high power densities |
| Wide temperature range (-40°C to +125°C) | Not optimized for differential-mode noise (requires additional filtering) |
| Compliance with IEC/EN 60939 safety standards | Higher cost compared to ferrite bead solutions |
---
## 2. Design Considerations
### Common Design Pitfalls and Solutions
| Pitfall | Solution |
|-------------|--------------|
| Saturation Under High Current | Operate below 80% of rated saturation current (e.g., 20 A max for CPFC74NPPS02H2A20). |
| Resonance at High Frequencies | Pair with X-capacitors (e.g., 100 nF) to dampen parasitic LC resonances. |
| Thermal Stress in Compact Layouts | Ensure ≥2 mm clearance from heat-generating components (e.g., MOSFETs). |
### Compatibility Issues
- Capacitors : Use low-ESR ceramic capacitors (e.g., X7R) to avoid impedance mismatches.
- ICs : Compatible with PWM controllers (e.g., TI UCC28C40) but may require snubbers for fast-switching FETs.
- Connectors : Avoid unshielded cables near the choke to prevent radiated EMI coupling.
### PCB Layout Recommendations
1. Placement : Position choke immediately after AC input and before the rectifier stage.
2. Routing :
- Keep input/output traces short and parallel to minimize loop area.
- Use a ground plane beneath the choke but avoid overlapping with high-speed digital traces.
3. Vias : Place thermal vias under the core for heat dissipation (if mounted on a heatsink).
4. Clearance : Maintain ≥3 mm creepage distance for safety compliance (IEC 60664-1).
---
## 3. Technical Specifications
### Key Parameters
| Parameter | Value | Explanation |
|---------------|-----------|-----------------|
| Inductance | 2.0 mH ±20% | Measured at 100 kHz, 0.25 Vrms; critical for noise attenuation bandwidth. |
| Rated Current | 16
