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DC DC Converters

A DC-to-DC converter is an electrical circuit that converts a source of direct current (DC) from one voltage level to another. It is an electrical device which is used to convert a variable DC voltage to a fixed DC voltage, or vice versa. The basic types of DC-to-DC converters are step-down (or buck) converters, step-up (or boost) converters, forward converters, and flyback converters.

PT7775C application field and working principle

The PT7775C are step-up DC-to-DC switching converters that was developed by Powertech Semiconductors. The converters operate with a wide input voltage range of 4 V – 30 V and offer a programmable output voltage range of 3 V – 24 V. The output voltage is set up by an external resistor. This device is designed for applications that require a wide input voltage range and high current capability up to 1.5A. The device can also include adjustable soft start time, protective features like reverse current protection, output short circuit protection and thermal protection, and over voltage protection, allowing for a safe and stable power supply system.

The working principle of the PT7775C converter is relatively simple. The device uses a voltage regulator based on the Pulse Width Modulation (PWM) technique to convert the input voltage to the desired output voltage. The voltage regulator is controlled by the PWM signal and converts the input voltage to the desired output voltage. An external resistor is used to set the output voltage. The voltage regulator is connected to the feedback pin with an external resistor to regulate the output voltage. The voltage regulator also has an enable pin which controls the switch in the device.

The PT7775C converter is a reliable and cost-effective device that is suitable for a wide range of applications. The device is highly efficient with a wide input voltage range and delivers a high output voltage accuracy, up to 1%. It also includes various protection features such as output short-circuit protection, over-voltage protection, and reverse current protection, making it a robust and reliable power supply system. With its low power consumption, high efficiency, and wide input voltage range, the PT7775C is an ideal device for a wide range of applications.

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