Diode Current Reg. 135V 2.2mA 2-Pin TO-206AA# Technical Documentation: CR200 Series Schottky Barrier Rectifier
## 1. Application Scenarios
### Typical Use Cases
The CR200 series Schottky barrier rectifiers are primarily employed in high-frequency switching applications where low forward voltage drop and fast recovery characteristics are critical. Common implementations include:
- Switch-mode power supply (SMPS) output rectification in DC-DC converters (buck, boost, flyback topologies)
- Freewheeling diodes in inductive load circuits (motor drives, relay coils, solenoid controllers)
- Reverse polarity protection in battery-powered devices and portable electronics
- OR-ing diode applications in redundant power systems and hot-swap configurations
- Voltage clamping circuits in transient suppression applications
### Industry Applications
- Consumer Electronics : LCD/LED TV power boards, laptop adapters, gaming console power supplies
- Automotive Systems : DC-DC converters in infotainment systems, LED lighting drivers, battery management systems
- Industrial Automation : PLC power supplies, motor drive circuits, industrial sensor interfaces
- Telecommunications : Base station power modules, network equipment DC power distribution
- Renewable Energy : Solar microinverters, charge controllers, power optimizers
### Practical Advantages
- Low forward voltage drop (typically 0.38V at 1A): Reduces power dissipation and improves efficiency in high-current applications
- Fast switching characteristics (negligible reverse recovery time): Minimizes switching losses in high-frequency circuits (>100 kHz)
- High surge current capability : Withstands inrush currents during startup and transient conditions
- Low thermal resistance : Enables compact designs without excessive heat sinking
- Lead-free and RoHS compliant : Meets environmental regulations for global markets
### Limitations
- Lower reverse voltage rating (20V-100V depending on variant): Not suitable for high-voltage applications
- Higher reverse leakage current compared to PN junction diodes: Can affect efficiency in low-power standby modes
- Temperature sensitivity : Forward voltage decreases with temperature (negative temperature coefficient)
- Limited avalanche capability : Requires external protection in circuits with significant voltage transients
## 2. Design Considerations
### Common Design Pitfalls and Solutions
| Pitfall | Consequence | Solution |
|---------|-------------|----------|
| Exceeding reverse voltage rating | Catastrophic failure, short circuit | Select device with V_RRM ≥ 1.5× maximum expected reverse voltage |
| Inadequate thermal management | Thermal runaway, reduced reliability | Calculate power dissipation (P_D = V_F × I_F) and ensure T_J < 125°C |
| Ignoring reverse recovery effects | EMI issues, switching losses | Use proper snubber circuits for inductive switching applications |
| Overlooking PCB parasitics | Ringing, overshoot, EMI problems | Minimize loop area, use proper decoupling, and implement controlled impedance traces |
### Compatibility Issues
- Mixed diode technologies : Avoid paralleling Schottky diodes with PN junction diodes due to different forward characteristics
- Gate drive circuits : Ensure CR200's low forward voltage doesn't interfere with MOSFET body diode conduction in synchronous rectifiers
- Analog circuits : High reverse leakage current may affect precision analog circuits; consider isolation or alternative components
- High-temperature environments : Derate current capability above 75°C ambient temperature (refer to derating curves in datasheet)
### PCB Layout Recommendations
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Critical Layout Priorities:
1. Minimize AC loop area for high di/dt paths
2. Provide adequate copper area for heat dissipation
3. Separate high-frequency switching nodes from sensitive analog traces
4. Use multiple vias for thermal relief when connecting to ground/power planes
Specific Guidelines:
- Place CR200 as close as possible to
