Mosfet(Metal-Oxide-Semiconductor field-effect Transistors) can be classified into three types based on their drain-source breakdown voltages: high voltage, medium voltage, and low voltage. Mosfets with different withstand voltage levels have significant differences in structure, performance, and application.
l Withstand voltage range: (commonly 200V to 1500V, or even higher).
l Design features:
Use Super Junction or lateral diffusion (LDMOS) structures to reduce on-resistance while maintaining high withstand voltage.
Slow switching speed (high parasitic capacitance), suitable for low-frequency high-voltage scenarios.
l Power conversion:
¢ AC-DC switching power supply (such as PC power, charger, server power).
¢ Inverter (solar PV, UPS uninterruptible power supply).
l Industry and Energy:
¢ Motor drives (industrial frequency converters, electric vehicle electronic control).
¢ High voltage direct current transmission (HVDC).
l Lighting:
¢ LED driver power supply, HID lamp ballast.
l Withstand voltage range: 30V to 200V.
l Design features:
¢ Balanced withstand voltage and switching performance, low on-resistance, suitable for medium power applications.
¢ The switching speed is moderate, suitable for scenarios such as DC-DC conversion, motor control, etc.
l Automotive electronics:
¢ 12V/24V systems (such as window motors, ECU power management).
¢ 48V mild hybrid system (MHEV).
l Industrial Controls:
¢ PLC (Programmable Logic Controller), servo drives.
¢ Industrial DC-DC converters (e.g. 48V to 12V).
l Consumer electronics:
¢ Power tools, drone electronic control (ESC).
¢ Laptop motherboard power supply (Buck/Boost circuit).
l Withstand voltage range: < 30V (commonly 1.8V to 30V).
l Design features:
¢ Very low on-resistance (milliohm level), suitable for high current applications.
¢ Ultra-fast switching speed (for high-frequency applications, such as MMHZ DC-DC).
¢ Package miniaturization (e.g. DFN, PowerPAK).
l Portable devices:
¢ Phone/tablet battery management (charge and discharge protection, load switch).
¢ Fast charge protocol chip (such as USB PD synchronous rectification).
l Computer hardware:
¢ CPU/GPU power supply (multiphase Buck circuits, such as server VRM).
¢ Motherboard power management (MOSFET array).
l Power management:
¢ Synchronous rectification (DC-DC converter).
¢ Low-voltage high-current switches (such as solid-state relays).
Types | Withstand voltage range | Core features | Typical application areas |
High voltage | ≥200V | High withstand voltage, shock resistance, low conduction loss | Power adapters, photovoltaic inverters, industrial power supplies |
Medium voltage | 30V~200V | Balance performance with cost | Automotive electronics, industrial control, power tools |
Low voltage | <30V | Ultra-low R DS(on), high-frequency switching | Fast charging for mobile phones, VRM for servers, BMS |
1. Withstand voltage: It needs to be higher than the actual working voltage with margin (e.g. 1.5 times).
2. On-resistance: Affects efficiency, low voltage MOS requires extremely low RDS (on).
3. Switching losses: Drive losses need to be optimized for high frequency applications.
Example:
l Electric vehicle charging station → High voltage MOS (650V to 1200V).
l Laptop motherboard → Medium-voltage MOS (30V - 100V).
l Fast charging chip for mobile phones → Low voltage MOS (20V - 30V).
The choice of different withstand voltage MOSFETs should be based on the voltage, current and frequency requirements of the specific application scenario.
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