TLPA18A Circuit Protection

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TVS (Transient Voltage Suppressors) are diodes that can protect electronic circuits from damage caused by high voltage or high energy electrical transients. They are commonly used in automotive, power electronics, computer and communications applications. Normally, TVS devices operate on the principle of clamping, which involves limiting the voltage level or current flow within a circuit or component to a desired value during a transient event. TVS diodes are usually placed between two more sections of the circuit, with each section having its own power supply. When the voltage exceeds the breakdown voltage (Vbr) set by the diode, it creates a reverse biased current path in the other devices connected to it, allowing the stored current to flow and protect the circuit from damage. The TLPA18A is a series of configurable TVS diodes that use this principle to protect against overvoltage or overcurrent events.

The TLPA18A is a three-terminal device with a high-performance breakdown voltage, one external resistor, and an optional two-stage zener clamp. It is optimized for high-frequency switching power supplies and uses proprietary switches to switch in two separate zener clamps to protect against surges brought on by lightning strikes. The first stage zener clamp offers protection for permanent surge events, while the second stage offers protection from fast transient surges. This device is designed to protect against overvoltage conditions up to 1550 volts, and current transients up to 10,000 amperes.

The TLPA18A utilizes three different breakdown voltages in a single package. Each breakdown voltage is represented by the letters "A", "B", and "C", and is assigned to a specific current rating, as follows: 1A (breakdown voltage of 1000 Vdc), 2A (breakdown voltage of 1500 Vdc), and 3A (breakdown voltage of 1550 Vdc). This device is rated up to 350 volts in continuous operation, and up to 500 volts transient operation. It has a Reverse Stand-off Voltage (Vr) of 9V, which means that the maximum continuous reverse voltage across the device cannot exceed 9 Volts.

The TLPA18A also features an internal thermal protection device, which is a resistor-based thermal overload protection circuit. This thermal protection device helps protect the device from damage due to overheating, which can be caused by an overload current passing through the device. The thermal protection circuit is designed to open the device\'s switch when the temperature of the device exceeds the preset limit. The thermal protection device limits the maximum current that can flow through the device during operation, and opens the device\'s switch when an overload occurs. This helps to protect the device from damage and ensures that the device does not continue to operate when the ambient temperature is too high.

The TLPA18A also features an integrated ESD protection circuit, which offers protection against electrostatic discharge. ESD (electrostatic discharge) is a spark of static electricity that can damage sensitive components. The ESD protection circuit limits the potential current damage to the components in a power supply circuit from an ESD event. The device is designed to clamp out damaging ESD voltages and currents, and also offers protection to the surrounding components. The integrated ESD protection circuit ensures that the device is able to operate reliably in applications that may be vulnerable to ESD events.

The TLPA18A is designed to provide superior protection to a wide range of electronic circuits, and is suitable for many demanding applications. Its highly configurable design allows the user to choose which breakdown voltages and which thermal protection devices to use, depending on the specific application needs. The integrated ESD protection circuit, thermal protection device, and external resistor make this device suitable for power supply protection circuits, automotive applications, and any other application that may be vulnerable to electrical overvoltage or overcurrent transients.

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