TF-DC-800V-470uF
TF-DC-800V-470uF high-performance DC-link capacitor for industrial inverters with low ESR and high ripple current cap...
Product Overview
Description
The TF-DC-800V-470uF is a high-performance DC-link capacitor designed for industrial inverter and converter applications.
This capacitor features metallized polypropylene film construction with optimized electrode design for low ESR and high ripple current handling.
The cylindrical aluminum case with dry resin filling provides excellent environmental protection and thermal performance.
Product Series
TF
Primary Application
Variable frequency drives
Key Features
- Low ESR metallized polypropylene film construction
- High ripple current capability for compact designs
- Self-healing properties for enhanced reliability
- Dry resin filled aluminum case
- Low inductance design for high frequency applications
- RoHS compliant and UL recognized
Specifications
| Capacitance | 470uF |
|---|---|
| Voltage Rating | 800V DC |
| Tolerance | ±10% |
| Ripple Current | 25A @ 10kHz, 45C |
| ESR | ≤2.5mΩ @ 10kHz |
| Temperature Range | -40C to +85C |
| Lifetime | 100,000 hours @ 45C, VR |
Applications
Variable frequency drives
Motor drive and control systems
Solar power inverters
Renewable energy systems
Wind power converters
Power conversion and supply
UPS power supplies
Electronic system design
EV onboard chargers
Battery and charging management
Industrial power supplies
Industrial automation and control
FAE Expert Insights
"In my extensive experience with industrial inverter designs, I have found Tongfeng's DC-link capacitors to offer excellent performance at a very competitive price point. The TF-DC-800V-470uF model provides ripple current capability comparable to premium European brands but at significantly lower cost. I particularly appreciate the consistent ESR specifications across production batches, which is critical for thermal design calculations. For solar inverter applications, I recommend operating these capacitors at no more than 80% of rated voltage to maximize lifetime. The 85C temperature rating provides good margin for outdoor cabinet installations. One design tip: when using multiple capacitors in parallel for higher current applications, ensure symmetrical PCB layout to balance current sharing. Overall, this is an excellent choice for cost-sensitive industrial designs where reliability cannot be compromised."
Excellent ripple current capability and consistent ESR make this ideal for industrial inverter applications
— David Chen, Senior FAE - Power Electronics, BeiLuo
Frequently Asked Questions
What is the maximum ripple current for the TF-DC-800V-470uF capacitor?
The TF-DC-800V-470uF capacitor is rated for 25A ripple current at 10kHz frequency and 45C ambient temperature. This rating is based on the thermal limit of the capacitor, where the internal temperature rise due to ESR losses must not exceed the maximum allowable temperature. At higher frequencies, the ripple current capability may be slightly reduced due to increased ESR at very high frequencies. At lower ambient temperatures, the ripple current capability increases - approximately 30A at 25C ambient.
For applications exceeding 25A ripple current, use multiple capacitors in parallel or select a higher capacitance model. Contact our FAE team for thermal modeling assistance.
How do I calculate the required DC-link capacitance for my inverter?
The required DC-link capacitance depends on several factors including DC bus voltage, allowable ripple voltage, load current, and switching frequency. A common formula is C = I / (2 × π × f × Vripple), where I is the DC current, f is the switching frequency, and Vripple is the allowable peak-to-peak ripple voltage. For a typical 400V DC bus with 5% ripple allowance (20V peak-to-peak), 10kHz switching frequency, and 20A DC current, the calculation gives approximately 160uF.
Provide your DC bus voltage, switching frequency, output power, and allowable ripple voltage to our FAE team for detailed DC-link capacitor sizing calculations.
What is the ESR of the TF-DC-800V-470uF and why is it important?
The TF-DC-800V-470uF capacitor has a maximum ESR (Equivalent Series Resistance) of 2.5mΩ at 10kHz. ESR is a critical parameter for DC-link capacitors because it determines the power dissipation (heat generation) due to ripple current. The power dissipation is calculated as P = I² × ESR, where I is the ripple current. Lower ESR means less heat generation for the same ripple current, resulting in longer capacitor lifetime.
For high ripple current applications, prioritize capacitors with low ESR specifications. The TF-DC series offers excellent ESR performance for demanding inverter applications.
How does temperature affect the lifetime of DC-link capacitors?
Temperature has a significant impact on DC-link capacitor lifetime, following the Arrhenius relationship. The TF-DC-800V-470uF is rated for 100,000 hours lifetime at 45C ambient temperature and rated voltage. For every 10C increase in temperature, the lifetime is approximately halved. Conversely, for every 10C decrease, the lifetime approximately doubles.
Implement proper thermal management including adequate ventilation, heat sinking if necessary, and voltage derating to maximize capacitor lifetime. Contact us for thermal design assistance.
Can I use multiple capacitors in parallel for higher ripple current?
Yes, using multiple DC-link capacitors in parallel is a common practice to achieve higher ripple current capability and lower effective ESR. When connecting capacitors in parallel, the total capacitance is the sum of individual capacitances, and the total ripple current capability is approximately the sum of individual ratings. However, proper current sharing is essential to avoid overloading individual capacitors.
For high ripple current applications, consider using multiple capacitors in parallel with symmetrical layout. Contact our FAE team for PCB layout recommendations.
What safety considerations apply to DC-link capacitors?
DC-link capacitors store significant energy and can present safety hazards if not properly handled. Key safety considerations include: Energy storage - a 470uF capacitor charged to 800V stores approximately 150 joules of energy, which can cause electric shock or arc flash. Always discharge capacitors before handling using a properly rated discharge resistor or bleeder circuit.
Implement proper discharge circuits, overvoltage protection, and secure mounting in your design. Contact us for safety-related application guidance.