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Method and System for Providing a Soft Start to Power Path Controllers

IP.com Disclosure Number: IPCOM000248123D
Publication Date: 2016-Oct-28
Document File: 1 page(s) / 34K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method and system is disclosed for providing a soft start to power path controllers. The method and system allows the power path controllers to turn on Field Effect Transistors (FETs) for a period less than Safe Area Operating (SOA) limits repeatedly until the power path controllers are turned on fully

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Method and System for Providing a Soft Start to Power Path Controllers


Power path controllers are used to distribute power and protect loads. The power path controllers typically use small FETs due to space constraints. On start up conditions, the power path controllers turn on the small FETs to charge a downstream capacitance. However, the small FETs lead to lower power dissipation amounts due to SOA curves.

Also, the power path controllers offer a retry function when a short is developed in the loads. But the retry function allows more energy to be burned in the short each time causing a smoke event. Further, the retry function tends to exhibit a rather low ratio between on and off time of the FETs. Thus, a device leakage of the load drains more energy stored in a load capacitance by increasing a number of retry functions before the power path controllers are turned on fully.

Disclosed is a method and system for providing a soft start to power path controllers.

The method and system allows power path controllers to turn FETs on for a period of time that is less than SOA limits of the FETs and current limits of components of the power path controllers. The power path controllers turn the FETs on to partially charge a downstream capacitance. Then, the FETs are turned off for a period to allow the FETs to cool down. The method and system repeats the turning on and off of the FETs until a rail is completely powered up without damaging the FETs.

Also, the method an...