Three pins of Schottky and three terminal Schottky connection method

Schottky diode is a semiconductor device that has a shorter voltage drop and recovery time compared to ordinary diodes, and is therefore widely used in many circuits. A Schottky diode has three pins, two of which are positive and one is negative, which is the design of a three terminal type. In this article, we will provide a detailed introduction to the three terminal design and connection of Schottky diodes.

1、 Three terminal design of Schottky diode

The three terminal design of Schottky diodes, also known as Schottky diodes with negative temperature coefficients, is different from conventional PN junction diodes in that it has a metal semiconductor contact instead of a PN junction. This design optimizes the flow and recombination of charge carriers, resulting in higher efficiency of current flow and low voltage drop.

A three terminal Schottky diode typically consists of two positive pins and one negative pin. The semiconductor region connected to the negative pin has a metal shell, and the negative pin itself is equivalent to the N region of the PN junction. The positive pin is connected to the P-type material in the semiconductor region. In Schottky diodes, a potential barrier is formed at the junction of metal and semiconductor, which can prevent most charge carriers from passing through. When current flows through the semiconductor region that filters the potential barrier, electrons are prevented from crossing the barrier and inertia is generated at the metal end. Therefore, the voltage drop of Schottky diodes is smaller than that of ordinary PN junction diodes.

2、 Application of Three Terminal Schottky Diode

1. Application of rectifier

Schottky diodes are widely used in rectifiers, switching power supplies, and power factor correction circuits. The fast switching characteristics and low voltage drop of the three terminal Schottky diode make it suitable for high-efficiency and low voltage drop rectifier applications.

2. Application of RF detector

Three terminal Schottky diodes are also widely used in radio frequency (RF) detectors. RF detector is a circuit that can convert RF signals into DC signals. The high-speed response characteristics and low noise of the three terminal Schottky diode make it a commonly used option in RF detectors.

3. Application of power amplifier

Three terminal Schottky diodes are also used in power amplifier applications. Such as high-power RF thermal therapy, three terminal Schottky diodes can provide high efficiency and good performance, and can reduce problems such as micro coefficients and power supply noise.

3、 Three terminal Schottky diode connection method

1. Positive negative positive connection method

This is the most common connection method, in which two positive poles are connected to two different power sources, and the negative pole is connected to the controlled load circuit. When the voltages of the two positive electrodes are equal, the three terminal Schottky diode is turned off and no current flows. When the voltage difference between the two positive electrodes exceeds the forward turn-on voltage of the Schottky diode, the Schottky diode begins to conduct, and current flows through the load circuit, causing the load circuit to operate.

2. Positive positive negative connection method

In this connection, the negative pole is connected to the ground (GND), and the two positive poles are connected to two different power sources, with one positive pole connected to the positive power source and the other positive pole connected to the negative power source. When the voltage difference between two positive electrodes is less than the forward turn-on voltage of the Schottky diode, the Schottky diode closes and no current flows. When the voltage difference between the two positive electrodes exceeds the forward turn-on voltage of the Schottky diode, the Schottky diode begins to conduct and current flows through the load circuit.

In short, the three terminal design and low voltage drop of Schottky diodes make them an indispensable component in many circuits. Under the correct application and connection, it can provide high efficiency, high-speed response, and stability.