LT1243CS8#TRPBF

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LT1243CS8#TRPBF is a high voltage synchronous buck DC-DC step-down converter integrated switching controller. It has tightly regulated output, high efficiency and excellent short circuit protection performance. With its high speed on/off transitions, it has a wide operating range, low input voltage and can support up to 7A output current. The chip is available in a thermally enhanced 24-pin DIP package.

The LT1243CS8#TRPBF is a synchronous buck that accepts unregulated inputs of 12V to 40V and can output voltages as low as 0.6V. It supports output current up to 7A and is a single phase switching controller. The LT1243CS8#TRPBF constant-frequency voltage-mode control provides high loop bandwidth and fast transient performance.

The LT1243CS8#TRPBF switching controller has several very useful features such as current-mode control, user adjustable operating frequency, selectable Soft-Start or Tracking, adjustable external gate drive and complete gate driver protection. Its cycle-by-cycle current limit, programmable UVLO and thermal protection protect the part from fault conditions while allowing excellent efficiency and board space savings.

The LT1243CS8#TRPBF application field is wide, it can be used in industrial power supplies, server power supplies, as well as distributed power architectures, charging systems, battery management, LED lighting, power tools, toys, automotive electronics and many other high voltage DC/DC applications.

Working Principle of the LT1243CS8#TRPBF

The LT1243CS8#TRPBF working principle is based on a single phase buck converter converter topology. When input voltage is applied to the LT1243CS8#TRPBF, it will turn on its high-side FET and begin to charge the output filter inductor with current from the input source. When the high-side FET is on, the gate of the low-side FET is being held at ground and is therefore off. As the inductor current rises, the operating frequency of the part is maintained by the internal oscillator.

When the voltage across the inductor reaches the level of the output voltage, the high side-FET is turned off, at the same time the low-side FET is turned on, and the inductor current is discharged through the low-side FET, providing current to the load. During this time the inductor\'s current is limited by the LT1243CS8#TRPBF’s current loop, ensuring that current limit is not exceeded. The LT1243CS8#TRPBF also has a built in soft-start feature, which allows for current limiting during startup. Once started up and working, the LT1243CS8#TRPBF maintains the input voltage and output voltage with excellent efficiency.

Conclusion

The LT1243CS8#TRPBF is a high voltage synchronous buck DC-DC step-down converter integrated switching controller, with tightly regulated output, high efficiency and excellent short circuit protection performance, suitable for a wide array of applications. Its working principle is based on a single phase buck converter, with adjustable external gate drive, current-mode control and selectable Soft-Start or Tracking. The chip is available in a thermally enhanced 24-pin DIP package, making it a very popular choice in the DC/DC market.

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