1000V 3 Phase Bridge in a D-63 package# Technical Documentation: 26MT100 Schottky Barrier Rectifier
## 1. Application Scenarios
### Typical Use Cases
The 26MT100 is a 100V, 26A Schottky barrier rectifier primarily employed in high-frequency switching applications where low forward voltage drop and fast recovery characteristics are critical. Common implementations include:
- Switch-mode power supplies (SMPS) - Particularly in output rectification stages of AC/DC converters and DC/DC converters
- Freewheeling diodes in buck, boost, and buck-boost converter topologies
- Reverse polarity protection circuits in high-current systems
- OR-ing diodes in redundant power supply configurations
- Battery charging circuits where low voltage drop minimizes power dissipation
### Industry Applications
Automotive Electronics:
- Electric vehicle power conversion systems
- LED lighting drivers
- Engine control units (ECUs)
- Battery management systems
Industrial Equipment:
- Motor drive circuits
- Welding equipment power supplies
- Uninterruptible power supplies (UPS)
- Industrial automation controllers
Consumer Electronics:
- High-power laptop adapters
- Gaming console power supplies
- Large-format display power modules
- Server power supplies
Renewable Energy:
- Solar inverter circuits
- Wind turbine power conversion
- Energy storage systems
### Practical Advantages and Limitations
Advantages:
- Low forward voltage drop (typically 0.55V at 13A, 25°C) significantly reduces power losses
- Fast switching characteristics with essentially no reverse recovery time enable high-frequency operation up to 500kHz
- High current capability (26A average forward current) supports power-dense designs
- Excellent thermal performance with low thermal resistance (1.5°C/W junction-to-case)
- High surge current capability (300A peak) provides robustness against transient overloads
Limitations:
- Higher reverse leakage current compared to PN junction diodes, particularly at elevated temperatures
- Limited reverse voltage rating (100V) restricts use in high-voltage applications
- Temperature sensitivity - Forward voltage decreases with temperature while reverse leakage increases
- Higher cost compared to standard recovery diodes with similar voltage/current ratings
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Thermal Management Issues:
- Pitfall: Inadequate heatsinking leading to thermal runaway
- Solution: Implement proper thermal calculations considering maximum junction temperature (150°C) and derate current based on ambient temperature
Voltage Spikes and Transients:
- Pitfall: Unsuppressed voltage spikes exceeding maximum reverse voltage
- Solution: Incorporate snubber circuits and TVS diodes for overvoltage protection
Current Sharing in Parallel Configurations:
- Pitfall: Unequal current distribution when paralleling multiple devices
- Solution: Use matched devices or include ballast resistors to ensure current balance
Layout-Induced Oscillations:
- Pitfall: Parasitic inductance causing ringing during switching transitions
- Solution: Minimize loop area in high-di/dt paths and use proper decoupling
### Compatibility Issues with Other Components
Gate Drivers and Controllers:
- Compatible with most PWM controllers (TI, Infineon, STMicroelectronics)
- Ensure controller dead time accommodates Schottky's fast recovery
MOSFET/IGBT Compatibility:
- Excellent pairing with modern MOSFETs in synchronous rectification
- Watch for voltage rating matching with switching devices
Capacitor Selection:
- Requires low-ESR capacitors for effective filtering
- Ceramic capacitors recommended for high-frequency decoupling
Magnetic Components:
- Works well with ferrite-core transformers and inductors
- Consider saturation characteristics when designing
