The UC1825B-SP is compatible with voltage-mode or current-mode topologies. The UC1825B-SP uses fixed frequency, peak current mode control. An internal oscillator initiates the turn-on of the driver to high-side power switch. The external power switch current is sensed through an external resistor and is compared through internal comparator. The voltage generated at the COMP pin is stepped down through internal resistors. When the sensed current reaches the stepped down COMP voltage, the high-side power switch is turned off.