DC1839A

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The DC1839A is a PWM controller IC evaluation board from National Semiconductor designed for off-line switch mode power supplies (SMPS) like DC/DC or AC/DC converters. An operating frequency of 200kHz is possible, while the DC1839A provides an integrated high-side FET as well as an adjustable current limit, allowing for a wide range of different applications. In order to improve reliability and robustness, the DC1839A also features short-on protection, soft-start and auto-restart.

DC/DC converters are used to convert a DC voltage from one level to another, while AC/DC converters transform alternating current (AC) into direct current (DC). The aim of either of these converters is to create a constant output voltage regardless of load or input level changes. For DC/DC converters, the PWM (pulse width modulation) technique is usually the method of choice in order to provide smooth voltage regulation to the load.

The DC1839A board makes use of this technique for voltage regulation. It provides an integrated high-side FET, programmable diode emulation and an adjustable current limit. The pulse width modulation is facilitated by a switching frequency of up to 200kHz, allowing for smooth transition in order to keep the output voltage constant. By making use of an Auto-Restart mode, the light load efficiency is also improved to ensure reliable operation under all circumstances.

In order to ensure reliable and robust operation, the DC1839A evaluation board can be complemented with several additional features. For example, the DC1839A provides a short-on protection, ensuring that the device is only turned on at the right moment. Furthermore, it also features a soft-start mechanism to reduce inrush current and a current limit protection to guarantee a safe operation. By controlling the amount of current drawn from the supply, a higher efficiency can be achieved.

The DC1839A evaluation board can be used in a variety of different applications ranging from low power dc/dc, ac/dc converters to flyback, buck, or boost configurations. It is suitable for a wide range of input and output voltages, making it the ideal choice for many design requirements. Additionally, the DC1839A can be programmed over an I2C interface for further customization and to adjust parameters in order to achieve the best performance.

In summary, the DC1839A evaluation board from National Semiconductor consists of an integrated PWM controller IC with an adjustable current limit and an integrated high-side FET. It is designed for reliable and robust operation under any conditions, making it suitable for a variety of applications such as DC/DC or AC/DC converters. Furthermore, the DC1839A can be programmed over an I2C interface in order to customize it for different design requirements, allowing for a wide range of different output voltages.

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