UNITRODE UCC4 Manuals

The document contains information about the SA40-18EWA supplier. The product has features and characteristics, please refer to the document for more details.

The UCC1800/1/2/3/4/5, UCC2800/1/2/3/4/5, and UCC3800/1/2/3/4/5 are a family of high-speed, low-power integrated circuits designed for off-line and DC-to-DC fixed frequency current-mode switching power supplies. They feature internal soft start, internal fault soft start, and internal leading-edge blanking of the current-sense signal.

UCC1800/1/2/3/4/5 is a high-speed, low-power integrated circuit that contains all of the control and drive components required for off-line and DC-to-DC fixed frequency current-mode switching power supplies with minimal parts count.

The UCC3580 family of PWM controllers is designed to implement a variety of active clamp/reset and synchronous rectifier switching converter topologies. It includes an auxiliary switch driver that complements the main power switch and has a programmable deadtime or delay between each transition. The features of this product family include voltage mode control, programmable limits for transformer volt-second product and PWM duty cycle, high current gate driver, multiple protection features, and low supply current.

The document is the datasheet of UCC1580-1,-2,-3,-4 UCC2580-1,-2,-3,-4 UCC3580-1,-2,-3,-4 PWM controllers, introducing the features and characteristics of the product.

The UCC3580 family of PWM controllers is designed to implement a variety of active clamp/reset and synchronous rectifier switching converter topologies. While containing all the necessary functions for fixed frequency, high performance pulse width modulation, the additional feature of this design is the inclusion of an auxiliary switch driver which complements the main power switch, and with a programmable deadtime or delay between each transition. The active clamp/reset technique allows operation of single ended converters beyond 50% duty cycle while reducing voltage stresses on the switches, and allows a greater flux swing for the power transformer. This approach also allows a reduction in switching losses by recovering energy stored in parasitic elements such as leakage inductance and switch capacitance. The oscillator is programmed with two resistors and a capacitor to set switching frequency.