UCC28084P [Unitrode]

The UCC38083/4/5/6 is a family of BiCMOS PWM controllers for dc-to-dc or off-line fixed-frequency current-mode switching power supplies. The dual output stages are configured for the push-pull topology. Both outputs switch at half the oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 110 ns, limiting each output’s duty cycle to less than 50%. The new UCC3808x family is based on the UCC3808A architecture with the addition of a programmable slope compensation ramp and the removal of the error amplifier. It features low start-up current, cycle-by-cycle current limiting, and internal soft-start on specific devices.