35V 10A Schottky Discrete Diode in a TO-220AC package# Technical Documentation: 10TQ035 Schottky Barrier Rectifier
Manufacturer : International Rectifier (IR)
## 1. Application Scenarios
### Typical Use Cases
The 10TQ035 is a 35V, 10A Schottky barrier rectifier primarily employed in power conversion circuits requiring low forward voltage drop and fast switching characteristics. Typical applications include:
- Switch-Mode Power Supplies (SMPS) : Used as output rectifiers in buck, boost, and flyback converters operating at frequencies up to 200 kHz
- DC-DC Converters : Employed in synchronous rectification circuits for improved efficiency in voltage regulator modules
- Reverse Polarity Protection : Circuit protection in automotive and industrial systems
- Freewheeling Diodes : Across inductive loads in motor drives and relay circuits
- OR-ing Diodes : In redundant power supply configurations and battery backup systems
### Industry Applications
- Automotive Electronics : Power distribution systems, engine control units, and infotainment systems
- Industrial Automation : PLC power supplies, motor drives, and control circuitry
- Telecommunications : Base station power systems and network equipment
- Consumer Electronics : High-efficiency power adapters, gaming consoles, and computing equipment
- Renewable Energy : Solar charge controllers and power optimizers
### Practical Advantages and Limitations
Advantages:
- Low Forward Voltage : Typically 0.55V at 10A, reducing conduction losses by 40-50% compared to standard PN junction diodes
- Fast Recovery : Essentially zero reverse recovery time (<10 ns), minimizing switching losses in high-frequency applications
- High Efficiency : Superior thermal performance due to low power dissipation
- Temperature Stability : Stable forward voltage characteristics across operating temperature range (-65°C to +175°C)
Limitations:
- Higher Reverse Leakage : Increased leakage current at elevated temperatures (up to 5 mA at 125°C)
- Voltage Rating : Limited to 35V maximum, restricting use in higher voltage applications
- Thermal Considerations : Requires proper heatsinking at maximum current ratings
- Cost : Typically 20-30% more expensive than equivalent ultra-fast recovery diodes
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Thermal Management Issues
- Problem : Inadequate heatsinking leading to thermal runaway at high ambient temperatures
- Solution : Implement proper thermal calculations and use copper pour areas ≥ 2 cm² per amp of current
Pitfall 2: Voltage Spikes
- Problem : Unsuppressed voltage transients exceeding 35V rating
- Solution : Incorporate snubber circuits and TVS diodes for overvoltage protection
Pitfall 3: Reverse Recovery Current
- Problem : Misunderstanding Schottky reverse recovery characteristics
- Solution : While recovery is fast, ensure proper gate drive timing in synchronous rectifier applications
### Compatibility Issues with Other Components
MOSFET Integration:
- Compatible with most modern power MOSFETs in synchronous buck converters
- Ensure gate driver ICs can handle the fast switching transitions
Controller IC Compatibility:
- Works well with popular PWM controllers (UC384x, LTxxxx series)
- Verify controller maximum frequency capabilities match diode switching speed
Passive Components:
- Requires low-ESR input/output capacitors to handle high di/dt
- Use high-frequency grade ceramic capacitors (X7R, X5R) near the diode
### PCB Layout Recommendations
Thermal Management:
- Use 2 oz copper thickness for power traces
- Implement thermal vias under the package (minimum 4-6 vias)
- Maintain minimum 3mm clearance from heat-sensitive components
Power Routing:
- Keep anode-cathode loop
