LM25061PMME-2/NOPB

Introduction

The LM25061PMME-2/NOPB is a Hot Swap controller developed by Texas Instruments (TI). It is designed to be used in power systems where it is necessary to maintain a constant supply of power to the system while the power source is turned on and off or while the load is being exchanged. The device enables safe on-line insertion or removal of a load over a wide input voltage range, with both toggling and sequencing control. This application field of hot swap controllers is particularly relevant in systems such as telecommunications and personal computers, where it is necessary to operate in an environment where hot swapping operations take place for operational convenience. This document will explain the working principles and various applications of the LM25061PMME-2/NOPB.

Application Field of the LM25061PMME-2/NOPB

The LM25061PMME-2/NOPB is designed specifically as a Hot Swap device, to handle hot insertion and removal of loads in a system. The device ensures a safe and controlled insertion or removal of the load devices, usually found in communication networks and personal computers, in order to maintain continuity of system operations even when parts of the system require frequent exchange. The device is capable of handling systems spanning from 4V to 27V, and has a range of features that enable safe and protected operation of the system.

The device features low on-state power dissipation of up to 0.37 W and high efficiency of up to 94%. It also offers current-limit protection with fast turn-off time of 9 ns, short-circuit protection, and current-foldback for over-current protection. The device supports both toggling and sequencing control, making it suitable for a large number of applications. Other features include adjustable voltage slew-rate limiting, adjustable overvoltage protection, thermal shutdown, enable/disable control, and adjustable output current limit.

Working Principle of the LM25061PMME-2/NOPB

The LM25061PMME-2/NOPB is a two-terminal device that provides hot swap control. When the device is activated, it draws a minimum current, which can be adjusted to set a fixed slew rate. This allows computers and other network-type equipment to be swapped in and out of a system without disruption. When the voltage on the LM25061PMME-2/NOPB rises above the minimum voltage specified for the device to start working, the current is increased accordingly and the device switches on the load. This process is called Soft Start scheduling, where the device gradually ramps up the current to the specified level for the device to function properly. The current continues to increase until it reaches the maximum current limit specified in the data sheet.

When the LM25061PMME-2/NOPB is connected to the load, it automatically detects the presence of an external device. On detection, the device switches the connected load on and remains in steady-state until the power supply is turned off or the load is disconnected. The device also has over voltage and over-current protection, which are triggered when the system voltage and/or current exceed the set limit. When the voltage jumps to an unsafe level, the device immediately shuts off the load, preventing any possible damage to the system.

The LM25061PMME-2/NOPB also supports sequencing control, which is often used in multiple devices connected in series. The device will automatically sequence the power turning on for each device, one after the other in a cascaded. This ensures that the power is distributed to each device evenly and prevents any device from overloading the system. When a load is disconnected, the device immediately turns off the power, protecting the system from any sort of malfunction.

Conclusion

The LM25061PMME-2/NOPB is a high-performance, Hot Swap controller developed for providing safe on-line insertion or removal of loads over a wide input voltage range. It offers a wide range of features that makes it an ideal device for applications where frequent hot swapping operations take place. The device is extremely efficient with a low on-state power dissipation and a high efficiency of up to 94%. It also offers current-limit protection with fast turn-off time, short-circuit protection, and current-foldback for over-current protection. It also provides sequencing control and over voltage and over-current protection to ensure safe operation of the system. In conclusion, the device is an excellent choice for any system requiring hot swap operations.