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What is a diode?

Switching Diode (SW): Structure and Features

Structure Symbol Applications・Characteristics
Figure - Rectification Diode Structure Figure - Rectification Diode Symbols
  • Ideal for a variety of switching applications
  • Switching speed:Short reverse recovery time trr

These diodes provide switching operation. Supplying voltage in the forward direction will cause current to flow (ON). Conversely, applying voltage in the reverse direction will stop current flow. Switching diodes are normally characterized by shorter reverse recovery times (trr), resulting in better switching performance.

Switch ON Switch OFF
Figure - ON Current Figure - OFF Current
What is reverse recovery time (trr)?

The reverse recovery time trr refers to the time it takes for the switching diode to turn completely OFF from an ON state. Generally, electrons cannot be stopped immediately after operation turns OFF, resulting in some current flow in the reverse direction.The higher this leakage current is, the greater the loss. However, reverse recovery time can be shortened through heavy metal diffusion, material optimization, or by developing FRDs (Fast Recovery Diodes) that suppress ringing after recovery.

Graph - High switching speed →Smaller area (power consumption)→ Less heat
Key Points
  • trr refers to the time it takes the current to disappear after voltage switches to the opposite direction.
  • A shorter trr translates to lower loss and higher switching speeds
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