PT78HT265H

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DC-DC converters are devices that can convert a DC voltage from one level to another. The PT78HT265H converter is an example of a DC-DC converter and is used to convert any voltage between 3 and 18 VDC to an output voltage of 5 VDC. This versatile converter is suitable for many applications including mobile electronics, digital imaging, audio/video equipment, and printer/scanner, etc.

Introduction

The PT78HT265H DC-DC converter is an ideal device to safely convert an input voltage from 3V-18V DC to an output voltage of 5V DC. It is a step-up converter that comes with a wide range of features including low quiescent current, wide input voltage range, overvoltage protection, soft start, and short-circuit protection. This converter operates from –25°C to 85°C, making it suitable for use in a wide range of applications.

Application Field

The PT78HT265H is a widely used device for a number of applications. This includes portable electronics, digital imaging, audio/video equipment, printer/scanner, and many more. It is well suited for applications where space is at a premium as it is very low profile with its height of only 2.3mm and can be easily mounted on a PCB to save on board space. The wide input voltage allows it to operate from a variety of sources including both USB and battery operated devices.

This converter is especially suitable for applications where high electrical noise environments exist due to the high switching frequency of up to 1MHz. The 4.5V to 18V input and 5V output combination of the converter make it ideal for applications such as smartphones, LED lighting, automotive electronics, and USB powered applications that require a reliable step-up regulator.

Working Principle

The PT78HT265H DC-DC converter uses a non-isolated buck topology with a synchronous rectifier. The circuit consists of a step-up regulator, an inductor, a diode, a schottky diode, and a capacitor. The step-up converter is powered by an input from 3V-18V DC, which is then boosted to the required output voltage of 5V DC using an inductor and a schottky diode. The output is then regulated using an internal error amplifier and a PWM comparator.

The device is highly efficient due to its synchronous rectifier to minimize switching losses. The adjustable current limit and overvoltage protection ensure that the device operates safely under any conditions. The PT78HT265H also features a soft start function which allows for a gradual start of the regulated output voltage to reduce inrush current.

Conclusion

The PT78HT265H DC-DC converter is a highly versatile device that can easily convert an input voltage from 3V-18V DC to an output voltage of 5V DC. It is suitable for a wide range of applications including mobile electronics, digital imaging, audio/video equipment, and printer/scanner. This converter is highly efficient and features low quiescent current, wide input voltage range, overvoltage protection, soft start, and short-circuit protection. This converter is an ideal device to power small applications with its adjustable current-limit and overvoltage protection.

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