TI UCC3813D-1

The UCC3813-x device family of high-speed, lowpower integrated circuits contains all of the control and drive components required for off-line and DC-toDC fixed-frequency current-mode switching power supplies with minimal parts count. These devices have the same pin configuration as the UC384x device 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 device family offers a variety of package options, temperature-range options, choice of maximum duty cycle, and choice of critical voltage levels. Devices with lower reference voltage such as the UCC3813-3 and UCC3813-5 fit best into battery operated systems, while the higher reference and the higher UVLO hysteresis of the UCC3813-2 device and UCC3813-4 device make these ideal choices for use in off-line power supplies. The UCC2813-x device series is specified for operation from -40°C to 85°C and the UCC3813-x device 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 the UCC3802 device, UC3842 device, and UC3842A device families

• Switch mode power supplies (SMPS)
• DC-DC converters
• Power modules
• Industrial PSUs Battery operated PSUs