The maximum safe operating area (SOA) for the STP21N90K5 is typically defined by the device's voltage and current ratings. According to the datasheet, the maximum voltage rating is 900V and the maximum current rating is 21A. However, it's essential to consult the datasheet and application notes for specific SOA curves and guidelines.
To ensure proper cooling, consider the device's thermal resistance (Rth) and maximum junction temperature (Tj). The STP21N90K5 has a thermal resistance of 0.45°C/W and a maximum junction temperature of 175°C. Use a suitable heat sink, ensure good thermal interface material, and follow the recommended PCB layout and thermal design guidelines to minimize thermal resistance.
The recommended gate drive voltage for the STP21N90K5 is typically between 10V to 15V. However, it's essential to consult the datasheet and application notes for specific gate drive requirements and guidelines to ensure proper device operation and minimize switching losses.
To protect the STP21N90K5 from overvoltage and overcurrent conditions, consider implementing overvoltage protection (OVP) and overcurrent protection (OCP) circuits in your design. These can include voltage regulators, zener diodes, and current sense resistors. Additionally, ensure proper PCB layout and routing to minimize parasitic inductances and capacitances.
The recommended dead time for the STP21N90K5 in a half-bridge configuration depends on the specific application and switching frequency. As a general guideline, a dead time of 100-200 ns is typically sufficient to prevent shoot-through currents. However, consult the datasheet and application notes for specific guidelines and recommendations.
STP21N90K5 datasheet
by STMicroelectronics
