Current limiting circuit for high-speed low-side driver outputs

In an ABS braking system, an FET switch for PWM the voltage across a control solenoid comprising:

• an FET switching transistor having a conductive path coupled to the solenoid at a node;
• a current detector coupled to a FET switching transistor for measuring a current therethrough, the current detector generating a current control signal in response to current through the FET switching transistor which exceeds a predetermined level;
• a first biasing current source coupled to the gate, the first biasing current source enabling the FET switching transistor to be turned on fast enough to generate a ringing at the node caused by the inductance of connecting cable which ringing causes the current detector to terminate the current control signal;
• a second biasing current source coupled to the gate, the second current source providing a biasing current;
• a biasing current switching circuit coupled to the first biasing circuit to disconnect flow of the first biasing current in response to the current control signal;
• and
• a deglitching circuit coupled to the current detector to prevent the current detector from terminating the current control signal as the result of the ringing.