TPS2346PW

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Hot swap controllers are power management ICs (PMICs) used to provide power in/out of hot swappable, low voltage Printed Circuit Boards (PCBs). TPS2346PW is an 8-channel hot swap controller from TI. It is used to protect downstream loads from over-temperature and over-current, provide turn-on sequencing, monitoring, and the automatic handling of power sequencing for a hot-swap system.

Application field

The TPS2346PW is designed for embedded systems applications such as network cards, storage systems, intelligent I/O, industrial and embedded computing, and telecom systems. By providing automatic power sequencing and protection from over-temperature and over-current, it can help protect downstream loads while providing the necessary power management for optimal operation.

Working Principle

The TPS2346PW is a controller IC that provides control and protection for 8 channels of hot swappable PCBs. It monitors the conditions on the board and turns on and off power supplies as needed. The circuit is based on an analog Multiplexer (MUX) that allows it to control up to 8 different power sources on the same channel.

Each channel has its own current sense resistor, which is used to monitor the current draw of the load on that channel. When the current draw exceeds the current limit of the channel, the IC will shut off the power supply and reset the MUX to move the power to the next available channel.

The IC monitors the temperature of the board and sets a safe temperature limit. If the board temperature exceeds its limit, the IC shuts off the power supply to the board and triggers an alarm. This helps prevent damage to sensitive systems due to excessive heat.

To keep the load in safe operation, the controller also sets a minimum recovery voltage level. If the voltage falls below this minimum level, the hot-swap controller removes power to the board and restores the voltage levels.

The TPS2346PW also provides an auto-reset feature that monitors the open/close status of the board and resets the power to the board if the open/close status changes. This helps to prevent any unexpected interruption of the power supply.

In addition, the IC offers protection against short circuits and overvoltages, and can also be used to generate an interrupt when the current draw is too high. This can be used to warn about possible system overloading and must be managed appropriately.

The TPS2346PW is a versatile and reliable controller IC for hot swappable PCBs. It provides effective power management and protection, allowing for greater system reliability and ease of use.

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