PTK25-D48-D12

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The usage ofPower Conversion for DC DC convertersin engineering and electrical applications extend from very simple voltage regulators to complex power supplies. This article will discuss the application field and working principle of PTK25-D48-D12, a type of DC DC converter.

Introduction to DC DC Converters

A DC DC converter is an electrical device used to convert DC, direct current, input voltage to higher, lower, or alternating voltages. By converting the direct current to alternating current, the efficiency of energy transfer is improved. Depending on the type of conversion occurring, DC DC converters can be categorized as isolated, non-isolated, step-down, and step-up converters.

Applications of DC DC Converters

DC DC converters have a wide variety of applications, including portable electronics, power supplies, solar power controllers, medical devices, telecommunications/networking equipment, industrial automation, and many more. Each DC DC converter can be tailored to the specific application at hand and can include features such as impedance matching, EMF compensation, frequency response, and input/output voltage protection.

The PTK25-D48-D12 DC DC Converter

The PTK25-D48-D12 is a high-efficiency, low-dropout DC DC converter from O2Micro. This converter is rated at 2.5W and converts an input voltage from 4.8V to 12V, allowing the powering of a wide range of devices, including automotive and industrial applications. The device features a wide operating temperature range of -40° C to +85° C and utilizes a synchronous PWM boosted architecture, making it ideal for applications requiring a fast, reliable power supply.

Working Principle of the PTK25-D48-D12

The PTK25-D48-D12 comprises of an input voltage regulator, an internal power switch, an error amplifier, a PWM circuit, an output correction transistor, a regulator, and a feedback reference voltage circuit. It also includes an EMI filter, a soft start, and an over-current protection system.

When the DC input voltage is applied, the input voltage is first regulated by the voltage regulator. This regulated voltage is then applied to the internal power switch, where it is switched on and off to create a duty cycle. This duty cycle is modulated by the PWM circuit, which is driven by the error amplifier. When the duty cycle is high, more charge is transferred from the input voltage to the output voltage. When the duty cycle is low, less charge is transferred, allowing the output voltage to stabilize. The output voltage is then referenced to the feedback voltage, and the regulator and the output correction transistor adjust the output voltage accordingly.

Conclusion

The PTK25-D48-D12 is a type of DC DC converter designed for a variety of applications, including automotive and industrial applications. It is designed to convert an input voltage of 4.8V to 12V at an efficiency of 2.5W. The working principle of the converter involves the regulation of the input voltage, the creation of a duty cycle through the internal power switch, the modulation of the duty cycle by the PWM circuit, and the adjustment of the output voltage via the regulator and the output transistor.

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