PTN78020AAZ

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DC-DC converters are electrical circuits used to convert direct current (DC) from one voltage level to another. PTN78020AAZ is a popular model of DC-DC converter which provides excellent voltage regulation performance. This article will discuss the application field and working principle of PTN78020AAZ.

The PTN78020AAZ is a three-terminal switching regulator specially designed for variable output voltage applications. The output voltage is regulated by controlling the internal high-side MOSFET switch to maintain a constant voltage at the output. The main features of this DC-DC converter include low voltage start-up, exceptional load regulation, low power dissipation, output current limiting, and wide input voltage range. Thanks to these features, the PTN78020AAZ has been widely applied in various applications, including notebooks and netbook power supplies, mobile phones, flat panel TVs, and GPS/ navigation systems.

The PTN78020AAZ works according to a Voltage Mode Control architecture. It is powered by an external transistor and input capacitor. During switching, the drain of the external transistor is at ground potential while the gate is driven high. This causes current to flow through the external transistor, generating an induced voltage across the input capacitor, producing the power necessary to drive the internal MOSFET switch. The feedback loop of the PTN78020AAZ monitors the output voltage continuously to ensure the output voltage does not exceed the preset level. Any deviation from the desired output voltage is detected by the feedback loop and the internal MOSFET is turned on or off accordingly.

The PTN78020AAZ is a cost-effective and reliable DC-DC converter suitable for variable output voltage applications. It provides excellent voltage regulation performance and has been widely applied in various applications. This article has discussed the application fields and working principle of the PTN78020AAZ.

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