TL494BDG

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TL494BDG is a kind of three-terminal DC-DC switching controller integrated circuit. It is primarily designed for efficient step-down (buck) low frequency applications, but it can also be applied in many other switching control related applications, such as inverters, isolated voltage regulator modules (VRMs), or wherever a constant current source, a high voltage switch, or a linear regulator is needed.

Application Field

TL494BDG is basically intended for use in offline switch mode power supplies (SMPS) with minimal external components, such as those used in products that require either stand-alone power supply or auxiliary power supplies for embedded systems. This component is typically used in applications such as laptops, monitors, televisions, small signal transistors, large signal transistors, etc. It is also suitable for high-frequency operations, such as those used in automotive applications, such as onboard electronics and car audio systems.

TL494BDG can also be used in digital power control applications, such as phase-controlled converters, pulse width modulators, or DC-DC boost controllers, and LED backlighting applications.

Working Principle

In a switch mode power supply, TL494BDG will act as a controller which allows the power supply to switch between two stable operating levels. It will use a control signal to turn the switch on and off so that the output voltage can be regulated to the desired level. The control signal usually comes from a feedback loop where a comparison is made between the output voltage and the reference voltage.

In this particular design, the TL494BDG is capable of controlling the current with a maximum frequency of 350kHz and can have a peak duty cycle of 99%. It also has a peak current sense capability of 250µA. The oscillator frequency of the TL494B is programmable, which makes it useful for controlling in applications that require different switching frequencies.

It also has a thermal shutdown capability which protects the device from damage due to excessive temperatures. The shutdown temperature can be adjusted by an external resistor, connected between pins 7 and 8.

TL494BDG also integrates two comparators with hysteresis, which can be used for monitoring both the voltage and the current. They can be used in a voltage or current mode, or in a combination of both. This further increases the flexibility of the device and makes it suitable for many different applications.

TL494BDG is usually used in combination with an external power switch, such as a bipolar or field-effect transistor, to control the power delivery. The power switch must be able to support the load current and be capable of switching at the same frequency as the TL494BDG.

Overall, the TL494BDG offers a stable and efficient switching controller solution for a variety of applications, from low-power portable electronics to high-power industrial systems.

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