1200V 20A Std. Recovery Diode in a D2-Pakpackage# Technical Documentation: 20ETS12S Schottky Diode
Manufacturer : International Rectifier (IR)
## 1. Application Scenarios
### Typical Use Cases
The 20ETS12S is a 20A, 120V Schottky diode primarily employed in high-frequency switching applications where low forward voltage drop and fast recovery characteristics are critical. Common implementations include:
Power Supply Circuits
- Switch-mode power supply (SMPS) output rectification
- Freewheeling diodes in buck/boost converters
- OR-ing diodes in redundant power systems
- Synchronous rectifier replacements in DC-DC converters
Industrial Applications
- Motor drive circuits for clamp diodes
- Welding equipment power stages
- Uninterruptible power supply (UPS) systems
- Battery charging/discharging protection
Automotive Systems
- Alternator rectification assemblies
- DC motor control circuits
- Power distribution modules
### Industry Applications
- Telecommunications : Server power supplies, base station power systems
- Renewable Energy : Solar inverter bypass diodes, wind turbine converters
- Consumer Electronics : High-efficiency laptop adapters, gaming console power supplies
- Industrial Automation : PLC power modules, motor drive units
### Practical Advantages
- Low Forward Voltage : Typically 0.65V at 10A, reducing power losses by 30-40% compared to standard PN junction diodes
- Fast Switching : Reverse recovery time <35ns enables operation at frequencies up to 200kHz
- High Temperature Operation : Rated for junction temperatures up to 175°C
- Low Reverse Leakage : <1mA at rated voltage and temperature
### Limitations
- Voltage Constraint : Maximum 120V reverse voltage limits high-voltage applications
- Thermal Sensitivity : Reverse leakage current doubles approximately every 10°C temperature increase
- Surge Current : Limited surge capability requires careful inrush current management
- Cost Consideration : Higher cost per ampere compared to standard recovery diodes
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Thermal Management Issues
- Pitfall : Inadequate heatsinking leading to thermal runaway
- Solution : Implement proper thermal calculations accounting for maximum junction temperature
- Recommendation : Use thermal interface materials and ensure minimum 0.5°C/W thermal resistance
Voltage Overshoot Protection
- Pitfall : Voltage spikes exceeding maximum reverse rating
- Solution : Incorporate snubber circuits and TVS diodes
- Implementation : RC snubber with 100Ω resistor and 1nF capacitor in parallel
Current Sharing Challenges
- Pitfall : Unequal current distribution in parallel configurations
- Solution : Add balancing resistors or use matched devices
- Guideline : 0.1Ω current-sharing resistors for parallel operation
### Compatibility Issues
Gate Driver Compatibility
- May require additional gate drive circuitry when replacing MOSFET body diodes
- Ensure proper dead-time control to prevent shoot-through
Controller IC Interface
- Compatible with most PWM controllers (UC384x, TL494, etc.)
- Check minimum on-time requirements for proper operation
Passive Component Selection
- Input/output capacitors must handle high ripple currents
- Inductor selection critical for proper current waveform shaping
### PCB Layout Recommendations
Power Stage Layout
- Keep diode close to switching MOSFET (maximum 10mm separation)
- Use wide, short traces for high-current paths
- Implement ground plane for improved thermal dissipation
Thermal Design
- Provide adequate copper area for heatsinking (minimum 2cm² per amp)
- Use thermal vias under package for improved heat transfer
- Consider forced air cooling for high ambient temperatures
Signal Integrity
- Separate high-frequency switching nodes from sensitive analog circuits
- Implement proper bypass capacitor placement (100
