Current Mode PWM Controller 1A 8-Pin SOIC T/R

The UCC3813-x family of high-speed, low-power integrated circuits contain 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.These devices have the same pin configuration as the UC384x family, and also offer the added features of internal full-cycle soft start and internal leading-edge blanking of the current-sense input.The UCC3813-x family offers a variety of package options, temperature-range options, choice of maximum duty cycle, and choice of critical voltage levels. Lower reference parts such as the UCC3813-3 and UCC38135 fit best into battery operated systems, while the higher reference and the higher UVLO hysteresis of the UCC3813-2 and UCC3813-4 make these ideal choices for use in off-line power supplies.The UCC2813-x series is specified for operation from –40°C to +85°C and the UCC3813-x series is specified for operation from 0°C to 70°C.  

100-µA Typical Starting Supply Current

500-µA Typical Operating Supply Current

Operation to 1 MHz

Internal Soft Start

Internal Fault Soft Start

Internal Leading-Edge Blanking of the Current-Sense Signal

1-A Totem-Pole Output

70-ns Typical Response from Current-Sense to Gate-Drive Output

1.5% Tolerance Voltage Reference

Same Pinout as UCC3802, UC3842, and UC3842A