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.
The document describes the UCC1580, UCC2580, and UCC3580 families of PWM controllers designed to implement active clamp/reset and synchronous rectifier switching converter topologies. These controllers feature auxiliary switch activation complementary to the main power switch drive, programmable deadtime between switch transitions, and voltage mode control with feedforward operation. They include multiple protection features with latched shutdown and soft restart capabilities.
| Supply Current (Startup) | 100 µA |
|---|---|
| Supply Current (Operation) | 1.5 mA |
| Oscillator Frequency | 370 to 430 kHz |
| Maximum Duty Cycle | 69 % |
| Reference Voltage | 5 V |
| OUT1 Drive Current (Sink) | 1.2 A |
| OUT2 Drive Current (Source) | 0.4 A |
| Storage Temperature (UCC1580) | −65°C to +150°C |
The startup current is 100 µA.
The typical operating supply current is 1.5 mA.
The oscillator is programmed with two resistors and a capacitor to set switching frequency and maximum duty cycle.
The REF pin is a precision 5.0V reference that can supply up to 5mA to external circuits.