TL494BD

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TL494BD Application Field and Working Principle

TL494BD is a high performance Pulse Width Modulation (PWM) controller meant for regulating the output of switching Mode Power Supply (SMPS) applications. It belongs to the family of PMIC (Power Management Integrated Circuits), and is placed under Voltage Regulators and DC DC Switching Controllers category.

It allows both high and low accuracy SMPS designs through the various operating and control parameter options that it provides. The wide variety of components and pins that it has enable the designers to come up with SMPS designs tailored to the requirements of the applications.

TL494BD Configuration Options

The small outline packaging of TL494BD makes it a more attractive choice compared to the traditional packages. It also helps in reducing the circuit board assembly cost. Moreover, its pin-out is compatible with existing industrial designs, removing the need for any additional changes in the board.

For regulating the output of the SMPS design, TL494BD features many configuration options. They are as follows:

• Internal modulation frequency compensation
• Peak primary current sensing
• Secondary feedback-regulation loop
• Auxiliary voltage sensing
• PWM switching frequency and duty cycle control
• Load current monitoring
• Operational frequency and dead time feature

TL494BD Working Principle

TL494BD operates on the fixed frequency oscillator principle. When the power supply is turned on, the oscillator starts with a delay period set by the dead time of the output transistors and the circuit configuration. This delay period sets the oscillator at a specific frequency as required for your design, that is, if the dead time is set to 0, then the oscillator will operate at the maximum frequency.

The output transistors then switch at the rate set by the oscillator. As they switch, they convert the power supply input voltage into a pulsating voltage. This is fed to the secondary feedback loop, which controls the pulse width of the output voltage.

The output voltage is then measured using the auxiliary feedback-regulation loop. The output of this loop is then compared to a reference voltage, and the oscillator is adjusted accordingly to maintain the required output voltage. This is the basic principle of the TL494BD.

TL494BD Applications

Apart from SMPS applications, TL494BD can also be used for controlling various AC/DC rectifiers and inverters. It can be used for any application requiring accurate control of power, from very low to very high power levels.

TL494BD is also used for controlling Buck and Boost applications. By controlling the varying frequency and duty cycle, the output voltage can be made to quickly move up and down. This feature can be used in various applications requiring fast variation in power.

Finally, TL494BD also finds application in many consumer applications, such as laptop and mobile charger power supply design. The features of adjustable frequency and duty cycle make it ideal for such applications.

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