TNY377PN

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The TNY377PN is a User Configurable AC-DC Converter packaged in a TO-92-Style package. It is designed to provide up to 18 watts of output power in a variety of applications, such as providing a regulated AC-DC converter for any type of equipment that requires a regulated output voltage. It is also useful for offline switchers, providing the flexibility of creating a custom power supply with the ability to control several variables.

The TNY377PN leverages Texas Instruments integrated control and power topology solutions to bring both efficiency and flexibility to end applications. Its design includes a high-efficiency primary-side switch, secondary-side synchronous rectification, and a unique proprietary loop compensation circuit. Ultra-fast loop response is enabled by a low internal current sense impedance. The device also has adjustable current limit, output undervoltage, and frequency settings.

The primary advantage of the TNY377PN is the ability to easily configure and modify the output voltage and current. With the adjustable frequency feature, the user can select frequency in the range of 1.168 MHz to 2.12 MHz. This provides flexibility to easily customize the power supply to tightly control the output voltage and power requirements of the end application. The user can also use the adjustable current limit feature to set the maximum current that can be provided by the AC-DC converter.

The working principle of the TNY377PN starts with the primary side switch, switching at a given operating frequency. At the rising edge of the switch, a fixed on-time is characterized by the duty cycle. The output voltage is adjusted by varying the duty cycle. The duty cycle is optimized for high efficiency and fast transient response by adjusting the proportional part (Kp) and integral part (Ki) of the current loop through internal and external loop-compensation components.

Additionally, a synchronous rectifier is used in the secondary side, enabling high robustness and efficiency with respect to the input voltage. The inductor and capacitor of the power stage provide damping and energy storage, respectively. The current limit protects the TNY377PN from overcurrent conditions, and the output undervoltage protection monitors and shuts down the device should the output voltage drop below a given voltage. Other protection features include an open-loop protection and short-circuit protection.

The TNY377PN is suitable for a wide variety of applications, including residential and commercial lighting, consumer appliances and home improvement products, medical equipment, and any other device that requires a regulated AC-DC converter or offline switcher. Its unique design, flexible configuration, and protection features makes it a great choice for any application that needs a reliable, efficient, and easy-to-configure power solution.

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