TNY253GN Integrated Circuits (ICs)

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The TNY253GN is a highly integrated AC/DC converters and offline switcher IC. The device includes an integrated avalanche-rugged 500 mA, 30 V power switch and a precise average current-mode PWM controller. It\'s the perfect choice for low power offline applications.

Features

The TNY253GN offers a wide range of features for AC/DC converters and offline switchers. Some of the most important ones include:

• Single-stage flyback topology
• Integrated 500 mA, 30 V power switch
• Excellent protection features: OPP, OVP and OTP
• High efficiency: up to 88%
• Integrated boost diode
• Programmable current-mode PWM control
• AC/DC detection

Application Field

The TNY253GN is ideal for a wide range of applications including power supplies for consumer, industrial, and automotive electronics. Common applications include but are not limited to:

• Dimming LED lighting
• Chargers
• Adapter for notebook, tablet and mobile phone
• Power adapter for electronic equipments
• DC/DC power supplies
• Game consoles and computer peripherals
• Industrial automation and control systems

Working Principle

The TNY253GN consists of two main components: an avalanche-rugged power switch and a precise average current-mode PWM controller. The power switch is used to switch on and off the mains power supply, while the controller is responsible for regulating the output power. The controller features multiple protection features such as over power protection and over voltage protection, as well as accurate current-mode PWM control and AC/DC detection.

Under normal operation, the input mains power is switched on and the internal power switch conducts. The power is then rectified and passed to the output filter and regulation circuit. The controller monitors the output voltage via an opto-coupler feedback, and adjusts the duty cycle of the power switch as necessary to maintain a fixed output voltage. This ensures that the output power is regulated and does not vary with input voltage or load.

When an overload or short-circuit condition occurs, the internal protection circuits will trigger and the power switch will shut off. The output voltage will drop and the controller will cycle the power switch on and off until the fault condition is cleared, at which the output will be regulated again.

Conclusion

The TNY253GN is a highly integrated AC/DC converters and offline switcher IC. It features a single-stage flyback topology and integrated 500 mA, 30 V power switch. The device also features excellent protection features such as OPP, OVP and OTP, as well as high efficiency up to 88% and programmable current-mode PWM control with AC/DC detection. It\'s the perfect fit for low power offline applications such as LED lighting, chargers, adapters and power supplies for consumer, industrial, and automotive electronics.

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