The current regulation level is set by 2 external resistors; RISET sets the CR Vth and the other is a low ohmic sense element across, which the CR Vth is developed. The CR duration is set by an external capacitor on the CTIM pin, which is charged with a 20A current once the CR Vth level is reached. If the voltage on the CTIM capacitor reaches 1.9V the IC then quickly pulls down the GATE output latching off the pass FET.