LM5068MMX-3

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The LM5068MMX-3 is an application-specific integrated circuit (ASIC) designed to control the insertion and removal of the load in hot-swap systems, thus enabling safe insertion and removal of a live load that is in a three-phase AC environment. This device incorporates a number of different features to assist with optimal hot-swap controller design, including adjustable overcurrent protection, undervoltage protection, and overvoltage protection.

The LM5068MMX-3 Hot Swap Controllers from Texas Instruments consists of three main stages: overload protection, undervoltage protection, and overvoltage protection. Overload protection is designed to prevent the system from being overloaded by disengaging the output stage during an overcurrent condition. Undervoltage protection is designed to detect the input power rail going below a certain trip point and safely remove the load before it becomes damaged. Overvoltage protection is designed to prevent the system from becoming damaged from an excessive voltage from the input source.

The LM5068MMX-3 has an adjustable overcurrent protection circuit that compares the voltage between the ground rail and the load current. When the voltage sensed is higher than the trip threshold, the overload protection circuit triggers a fault stage and the output stage is disconnected. The adjustable trip threshold of the overload protection can be varied using an external resistor. The undervoltage protection compares the input voltage level against a preset trip point and will trigger the fault stage when the voltage falls below the preset value.

The overvoltage protection is externally adjustable using an external resistor and compares the input voltage against a preset overvoltage threshold. The overvoltage protection in the LM5068MMX-3 Hot Swap Controllers is designed to help guard against an excessive or high voltage from the input source that could potentially damage the system. In the event of an overvoltage, the fault stage is triggered and the load is safely removed from the system.

The LM5068MMX-3 from TI also features an Advisory Fault signal that provides an early warning of an undervoltage or overcurrent condition prior to a fault. This allows systems to be designed for better load cycle management, enabling the user to prepare for a fault condition before it occurs and safely remove the load. Additionally, the device has a number of safety features such as current monitoring and thermal management to help provide reliable operation.

In conclusion, the LM5068MMX-3 Hot Swap Controllers from Texas Instruments are an ideal choice for hot-swap systems requiring overcurrent, undervoltage, and overvoltage protection. The adjustable trip points and early warning signals, combined with the additional safety features, make it an ideal choice for single- and three-phase hot-swap designs.

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