Fet switch driver#

Once the PROFET is on (IN=1) and the diagnosis is enable (DEN=1), it will track the accuracy of the current sense (I IS). To understand the over temperature and overcurrent protection, let’s take a look at this graph.

For that, all PROFET have an integrated temperature sensor. However, maintained for some time, the load current will actually heat the device and trigger the overtemperature protection. where the load current might not be high enough to be detected by the diagnostics. Typically, the overtemperature protection is enabled if the temperature of the junction reaches unsafe levels, e.g. Overtemperature and overcurrent protection The overtemperature protection isĮnabled if the temperature of the MOSFET junction reaches unsafe levels: the switch is turned off stopping the current flow completely.įinally, diagnostics are included so the smart switch can provide feedback to a microcontroller if a fault condition is detected. This again helps to protect the switch from short to ground/battery conditions. The current limit feature limits the maximum current that the MOSFET switch can source. The reverse battery protection keeps the smart switch safe if the battery polarity is reversed (current may flow, but the device will not beĭamaged). The overvoltage protection ensures the MOSFET will not be damaged during load dump transients or other high voltage events (assuming the transient pulse energy is within specified limits). For example, short circuit protection can protect the MOSFET if a short to ground/battery occurs. In addition, several protection features are integrated.

Fet switch driver#

It consists of a MOSFET, a gate driver with charge pump, and multiple protection and diagnosis features. PROFET (PROtected Field Effect Transistors) is our High-Side smart power switch brand. automotive, industrial, consumer, commercial, construction, and agricultural vehicles (CAV)). Additionally, the different PROFET™ high-side load switch families can protect against dynamic overvoltage such as load dump and inductive load turn-off depending on the application they were designed for (e.g. Our latest DMOS transistor technologies offer improved short circuit robustness and better performance as well as high voltage capability and optimized chip size.Īll PROFET™ smart high-side power switch families offer protection against overload, overvoltage, short-circuit, excessive temperature, ground loss, power supply loss, and Electrostatic Discharge (ESD). Infineon’s PROFET™ protected high-side MOSFET power switches offer solutions for a wide range of automotive and industrial applications and are available as single and multi-channel switches.

PTC heater) using the newest low R DS(on) high current switches. With state-of-the-art diagnostics and protection features, PROFET™ devices can switch loads in a wide current range including cost optimized solutions, for loads below 1 A (e.g. Infineon’s extensive portfolio of PROFET™ smart high-side power switches is clustered into a variety of product families that are supported for a wide range of applications. PROFET™ intelligent high-switches consist of DMOS power transistors and CMOS logic circuitry to form a device with integrated driver functionality, protection, and diagnostic features. PROFET™ stands for PROtected MOS FET and gathers all high-side switches, including automotive qualified and products for industrial use. The PROFET™ family is Infineon's solution for power switch ICs. Additionally, smart high-side switches are designed with the ability to protect themselves and diagnose possible unintended system behavior. High-side switches are used to turn electrical loads ON and OFF by switching the positive (high-) side of the load supply.