The TPS7H500x-SP series uses fixed frequency, peak current mode control. Each controller regulates the peak current and duty cycle of the converter. The internal oscillator initiates the turn-on of the primary output used as the gate driver input for the power switch. The external power switch current is sensed through an external resistor and compared via internal comparator. The voltage generated at the COMP pin is stepped down via internal resistors. When the sensed current reaches the stepped down COMP voltage, the power switch is then turned off.