STPS30SM80CT

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Diodes are typically used in different applications such as rectifiers, arrays, voltage regulators, charge pumps and so on. The STPS30SM80CT is an example of a Diode Array that is used for Power Rectification and protection. The STPS30SM80CT, is a three-terminal surface-mount 30A, 800V Schottky diode array. It is ideally suitable for use in strongly inductive load switching circuits and for protection against high surge overloads in an AC/DC power supply based applications.

The following is a review of the application field and working principle of the STPS30SM80CT.

Application Field

The primary use of this diode array is in high frequency DC/DC converters and PFC circuits, as they offer high performance, low switching losses and enable high efficiency step-down and step-up converter operation. The three-terminals provide low drop-out operation and enable high current switching capability, which allows it to be used as an active rectifier in power supplies. It is also ideal for high voltage protection in low voltage regulators and digital controllers.

The STPS30SM80CT is also suitable for regulated current limitation, short circuit protection and reverse polarities for charging applications. In addition, it can be employed to reduce conducted EMI in low voltage power supplies, and in active regenerative snubber circuits.

Working Principle

The STPS30SM80CT is a three-terminal device with an internal current limiter. Two of the terminals form a sharp junction between the active and the protective area-enabling them to respond accurately to current changes in microseconds. The third terminal is used for switching the limiter on and off.

The diode array employs a high frequency transition between the forward and reverse conduction phases of its operation. This transition allows the diode array to respond quickly to current changes, and it also minimizes power losses by allowing the forward voltage drop to remain low. The other benefit of this design is that it reduces in-rush current while allowing very high charge rate. The diode array also features a very low reverse recovery time, so that it can protect equipment from reverse operating voltages.

In addition to providing protection from overloads and surges, the STPS30SM80CT reduces conducted EMI from the power supply, and also helps to reduce system noise.

Conclusion

The STPS30SM80CT is a high performance, low switching losses, three-terminal, surface-mount diode array. It is ideally suited for power rectification and protection, and is suitable for high frequency DC/DC converters and PFC circuits. It is also well suited for low voltage protection in low voltage regulators and digital controllers, current limitation, short circuit protection, reverse polarities and reducing conducted EMI in low voltage power supplies.

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