PT78ST112V

DC-DC converters are an important type of electronic equipment used to convert direct current (DC) electricity into a form that can be used in a variety of electrical applications. The PT78ST112V is a high-efficiency, isolated DC-DC switching converter with a wide range of input and output voltages, making it suitable for a variety of applications.

General Description

The PT78ST112V is a switching DC-DC converter designed to support a nominal input voltage range of 9 to 36V, and output voltages of 5.0, 9.0, 12.0, 15.0, 18.0, 24.0 V. It offers up to 75 watts of power in a wide range temperature range (−40℃ to 85℃). The PT78ST112V is an isolated, fixed-frequency buck-boost converter with synchronous rectification and adjustable output voltage. It is designed to minimize current losses, translating into increased efficiency and higher reliability.

Features

The PT78ST112V features a variety of protection and monitoring abilities, including continuous short circuit protection (SCP), thermal cut-off (TCO), over temperature protection (OTP), and over current protection (OCP). It also has an on/off control input and enable pin, which can be used to control the output of the converter. The PT78ST112V also features a unique voltage weighted ripple rejection for reducing noise and minimizing EMI filter size.

Applications

The PT78ST112V is suitable for a wide range of applications, including industrial control systems, motor drives, point of sale systems, office and medical equipment, telecom equipment, and more. It can also be used in automotive systems, power supplies, and alternators. The PT78ST112V supports both wide input range and output voltage applications, making it extremely versatile.

Working Principle

The PT78ST112V DC-DC converters work by switching the input voltage through an inductor into an output capacitor. This results in a step-down power conversion with isolated output. The voltage regulation is achieved by comparing the output voltage against a reference voltage. The frequency is fixed and is optimized for the required output voltage, while the output voltage is adjusted by a voltage setting pin. The PT78ST112V includes synchronous rectifiers, which improves efficiency and reduces the input ripple current. This also allows for a smaller inductor size and therefore a smaller overall package size of the DC-DC converter.

Conclusion

The PT78ST112V is a high-efficiency, isolated DC-DC switching converter designed for a wide range of applications. It features a wide input voltage range and output voltages of 5.0, 9.0, 12.0, 15.0, 18.0, and 24.0 V. It supports both wide input range and output voltage applications, allowing for versatile use in various industrial applications. The PT78ST112V also includes a variety of protection and monitoring abilities, as well as a unique voltage weighted ripple rejection for reducing noise and minimizing EMI filter size.