BRD1267C
BridgeSwitch-2 high-current driver with 600V FREDFETs for BLDC motors up to 1.5HP
Product Overview
Description
The BRD1267C is a high-current member of the BridgeSwitch-2 family, designed for larger BLDC motor applications requiring up to 10A RMS.
This IC integrates two 600V FREDFETs with low RDS(on) of 0.55Ω, enabling efficient operation for motors up to 1.5HP.
The device maintains all BridgeSwitch-2 features including integrated bootstrap, phase sensing, and comprehensive protection.
Product Series
BRD
Primary Application
Large refrigerator compressors
Key Features
- High-current 10A RMS capability
- Low RDS(on) 0.55Ω FREDFETs
- 600V rating for universal input
- Integrated bootstrap supply
- Phase current sensing
- Enhanced thermal performance
Specifications
| Voltage Rating | 600V |
|---|---|
| Current Rating | 10A RMS |
| Power Rating | Up to 1.5HP |
| FREDFET RDS(on) | 0.55Ω |
| Switching Frequency | Up to 50kHz |
| Package | eSOP-16B |
Applications
Large refrigerator compressors
Electronic system design
Commercial HVAC systems
Electronic system design
Industrial pump motors
Motor drive and control systems
High-power appliance motors
Motor drive and control systems
FAE Expert Insights
"The BRD1267C extends BridgeSwitch capability to higher power motor applications. The 10A RMS rating and low 0.55Ω RDS(on) enable driving motors up to 1.5HP with excellent efficiency. What I particularly like is the eSOP-16B package with exposed pad - it provides much better thermal performance than standard packages for high-current operation. The integrated features remain the same as lower current variants, making it easy to scale designs. For commercial HVAC and large appliance applications, this device offers an excellent balance of integration, performance, and cost."
High-current capability with excellent thermal performance for large motors
— Kevin Liu, BeiLuo
Frequently Asked Questions
What is the maximum motor power for BRD1267C?
The BRD1267C can drive BLDC motors up to 1.5HP (1.1kW) under typical conditions. The actual maximum power depends on: 1) Motor voltage - 230V or 460V systems, 2) Current requirement - up to 10A RMS continuous, 3) Thermal conditions - adequate heatsinking required, 4) Switching frequency - higher frequencies increase losses, 5) Motor efficiency - affects overall system power. For 230V systems, 1.5HP is achievable with proper thermal design. For 460V systems, consult the datasheet derating curves. Always verify thermal performance under worst-case conditions.
Use BRD1267C for motors up to 1.5HP with proper thermal management. Contact FAE for high-power design assistance.
How do I manage thermal design for high-current operation?
Thermal management for BRD1267C high-current operation requires: 1) Package selection - eSOP-16B with exposed pad provides best thermal performance, 2) PCB copper area - use maximum copper area (recommended 500mm²) connected to exposed pad, 3) Thermal vias - multiple vias under exposed pad to inner layers, 4) Airflow - ensure adequate airflow in enclosed applications, 5) Operating current - monitor actual device temperature under maximum load. At 10A RMS, device dissipation is approximately 5-8W depending on duty cycle. Junction temperature must not exceed 150°C. For continuous high-current operation, consider external heatsinking.
Provide adequate copper area and consider airflow for high-current designs. Contact FAE for thermal simulation assistance.
Can I parallel BridgeSwitch devices for higher current?
Paralleling BridgeSwitch devices is possible but requires careful design: 1) Current sharing - ensure balanced current distribution between devices, 2) Gate drive - synchronized gate drive signals are critical, 3) Layout - symmetrical layout for equal current sharing, 4) Protection - coordinate overcurrent protection between devices, 5) Control - MCU must manage multiple half-bridges. For most applications, using a single higher-current device (like BRD1267C instead of BRD1265C) is preferred for simplicity. If paralleling is necessary, follow application note guidelines and perform thorough testing under all operating conditions.
Use single higher-current device when possible. Contact FAE if paralleling is required for your application.
What is the switching frequency range for BridgeSwitch?
BridgeSwitch supports switching frequencies up to 50kHz, with typical motor drive applications using 8-20kHz: 1) Lower frequencies (8-15kHz) - lower switching losses, suitable for larger motors, 2) Medium frequencies (15-25kHz) - good balance of losses and audible noise, 3) Higher frequencies (25-50kHz) - smaller filters, higher losses. The optimal frequency depends on motor characteristics, efficiency requirements, and audible noise constraints. For appliance motors, 16kHz is common to avoid audible noise. The device maintains consistent performance across the frequency range with proper gate drive.
Select switching frequency based on motor size and efficiency/noise trade-offs. Start with 16kHz for appliance applications.
How do I select external components for BridgeSwitch?
External component selection for BridgeSwitch involves: 1) Bootstrap capacitor - typically 0.1-1μF, 100V rating, 2) Bootstrap diode - fast recovery diode rated for high-side voltage, 3) Current sense resistor - low value (0.01-0.1Ω) for phase current sensing, 4) VCC capacitor - 10-47μF for supply filtering, 5) Gate resistors - optional for slew rate control. The datasheet provides recommended values and selection criteria. For bootstrap capacitor, size depends on switching frequency and MOSFET gate charge. For current sense, use low-inductance resistors for accurate measurement. Always use components rated for the operating voltage and temperature.
Follow datasheet recommendations for external components. Contact FAE for component selection assistance.