TL2843BP

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TL2843BP application field and working principle

Integrated power management IC (PMIC) has become increasingly popular as its ability to manage power across multiple voltage rails in today’s compact designs. Whilst they contain many layers of protection to guard the system from damage and malfunction, the most important function of PMIC: voltage regulators and DC/DC switching controllers are the cornerstones of power management. In this article, the TL2843BP is used as an example to explain their application field and working principle.

TL2843BP DC/DC Switching Controllers

TL2843BP is a high-efficiency, low-side, synchronous, step-down DC-DC converter with a wide variety of features. It operates at 2.0MHz switching frequency, which allows for the use of small external components and low-radiated noise for most applications. The TL2843BP contains a 30mΩ integrated low RDS(on) NDMOSFET. This device is widely used in multi-rail applications such as server, gaming, automotive electronics, and consumer goods. TL2843BP is designed to help users reduce costs, reduce solution size, and improve power system reliability.

Features of TL2843BP DC/DC Switching Controllers

TL2843BP features a wide range of features that make the device suitable for most applications. These features include:

• 2 MHz maximum switching frequency that enables use of small external components.
• Selectable PWM/PFM operation.
• Integrated 30mΩ N-channel MOSFET.
• External synchronization capability.
• Internal current loop with adjustable slope compensation.
• Remote sense, input voltage, and output voltage feedback.
• Cycle-by-cycle current limit.
• Programmable soft-start.
• Overcurrent and thermal shutdown protection.

Working Principle

The TL2843BP is a synchronous switching buck regulator. It has an internal high-side PFET and low-side N-channel power MOSFET. The control circuit is a pulse-width modulated (PWM) controller which is used to control the output voltage. When power is applied to the input, the PWM controller will turn on the low-side MOSFET and allow the output capacitor to charge to the expected output voltage. The PWM controller will then begin to switch the input voltage at a desired frequency to maintain a stable output voltage. As the output voltage is regulated through the PWM controller, the device will have a high efficiency.

The TL2843BP also has a number of features that ensure the device is reliable and safe. These features include a programmable soft start, cycle-by-cycle current limit, over-current protection, and thermal shutdown. The TL2843BP also has an internal current loop with adjustable slope compensation which helps to reduce output voltage ripple and improves the load transient response. Finally, the TL2843BP has an open-drain master enable pin that allows for remote voltage control for the entire system.

Conclusion

In short, the TL2843BP is a high-efficiency, low-side, synchronous, step-down DC/DC converter that can be used in a variety of applications. The TL2843BP offers a wide range of features such as current loop, adjustable slope compensation, programmable soft-start, and over-current and thermal shutdown protectors to ensure system reliability. The PWM controller enables the device to switch over 2MHz and have a high efficiency. Consequently, the TL2843BP is an ideal choice for multi-rail applications such as servers, gaming, automotive electronics, and consumer goods.

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