TNY278PG

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Integrated circuits (ICs) are perhaps one of the most important and most popular tools used in modern day electronics. In particular, offline switcher ICs such as TNY278PG are used extensively in a variety of industries. This article will discuss the applications of TNY278PG in AC-DC converters, as well as its working principle.

What are the Application Fields for TNY278PG

The TNY278PG is a low cost, high-efficiency, offline switcher that is used in a variety of applications, including:

• Programmable AC-DC converters
• Isolated DC-DC converters
• Off-line battery chargers
• LED lighting applications
• PC peripherals

The TNY278PG has many notable characteristics and features that make it very useful in these applications. Specifically, the device can operate in an extremely wide input voltage range, from 100V to 700V, and also features a built-in low-loss power switch, allowing for very high efficiency switching. Furthermore, it features internal soft-start and output over-voltage protection, making it ideal for highly-dynamic systems. Finally, the TNY278PG also features a frequency slewing feature, allowing the switching frequency to be significantly improved during no-load and light-load conditions, improving system efficiency.

How Does TNY278PG Work

The TNY278PG device is based on a valley-fill topology, a type of topology used in AC-to-DC conversion. This topology works as follows:

• The primary AC voltage is rectified into a DC bus voltage using a full-wave bridge rectifier.
• This rectified voltage is then stored in an output capacitor (Cout).
• The output voltage is then regulated through a feedback loop.
• Through this feedback loop, an internal power switch (MOSFET) is enabled or disabled, depending on whether the output voltage has reached the reference voltage.
• If enabled, the power switch is used to draw current from the DC bus via a primary transformer winding, which is then rectified and filtered to create the output voltage.

The TNY278PG also features a dynamic frequency control circuit that helps to reduce operating frequency under light loads in order to reduce power losses and improve efficiency.

Conclusion

The TNY278PG is a low cost, high-efficiency, offline switcher IC which can be used in a wide variety of applications, including programmable AC-DC converters, isolated DC-DC converters, off-line battery chargers, LED lighting applications, and PC peripherals. The device works based on a valley-fill topology, and features a built-in power switch, over-voltage protection, soft-start, and frequency slewing. These features make the TNY278PG an ideal choice for designs requiring a highly reliable, efficient, and cost-effective offline switcher IC.

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