TEA19051BAFTK/1J

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TEA19051BAFTK/1J Application Field and Working Principle

The TEA19051BAFTK/1J is a low power offline switcher controller designed for use in high efficiency AC-DC converters. It is ideal for powering battery chargers and LED lighting applications. It features a wide voltage range (from 5.5 up to 500VAC), low quiescent current, high efficiency, and fast transient response times. The TEA19051BAFTK/1J also offers a unique constant current control capability for powering high power LED bulbs.

The TEA19051BAFTK/1J is a primary side control device that eliminates the need for an opto-coupler and associated components. The device contains all necessary features for designing a high efficiency flyback power supply, including auto restart and overload protection. It is designed to implement a peak current mode topology, with an adjustable maximum duty cycle. The built-in under-voltage lockout (UVLO) prevents the switching circuit from operating until the AC input voltage reaches the threshold. It also includes a line compensation loop allowing the power supply to maintain a constant output voltage in spite of line variations.

To use the TEA19051BAFTK/1J, the AC input voltage is connected to the terminal labeled "Line". The output terminal is usually connected to the rectifier diodes and the load. The control pin labeled "GND" is connected to the common ground reference. The enable pin "EN" can be used to enable or disable the converter, if necessary. The "FB" pin is connected to the voltage divider network to sense the output voltage of the power supply, and the "24V" pin is connected to a separate power supply for the internal circuitry, such as the floating driver circuit.

To better understand the working principle of the TEA19051BAFTK/1J, consider the block diagram shown in Figure 1. In the standby mode, the input power is low and the controller is disabled. As the input voltage rises, the UVLO is activated and the controller enters the soft start mode. Once the power is sufficient, the soft start circuitry terminates and the PWM starts to control the primary side of the transformer. In this state, the input voltage is usually double of the output voltage.

The power is transferred to the secondary side via the transformer. The rectifier diodes act as rectifiers and the capacitors act as filters. During the power on phase, the controller monitors the output voltage to determine if the voltage is above or below the desired set point. If the voltage is lower than the set point, the controller will increase its duty cycle. As the output voltage reaches the set point, the controller will reduce its duty cycle to keep the output voltage steady.

In addition, the TEA19051BAFTK/1J includes a unique current limiting feature. This feature uses a Hall effect current sensing transformer to measure the current in the primary winding. If the current in the primary winding exceeds its set point, the controller will reduce the duty cycle to limit the current. This feature prevents the power supply from being overloaded, thus increasing its reliability and safety.

Overall, the TEA19051BAFTK/1J is a versatile controller with robust features and high efficiency. It is ideal for powering battery chargers and LED lighting applications. With its wide operating range and current limiting feature, it offers a great solution for safe and reliable AC-DC power supplies.

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