The UCC3813-x device family of high-speed, low-power integrated circuits 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.
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.
| Topology | Boost, Flyback, Forward |
| Control mode | Current |
| Duty cycle (max) (%) | 100 |
| Switching frequency (max) (kHz) | 1000 |
| Features | Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Leading edge blanking, Multi-topology, Soft start |
| UVLO thresholds on/off (V) | 12.5/8.3 |
| Operating temperature range (°C) | -40 to 85 |
| Rating | Catalog |
| Gate drive (typ) (A) | 1 |
| Vin (max) (V) | 11 |
| SOIC (D) | 8 | 29.4 mm² 4.9 x 6 |
| TSSOP (PW) | 8 | 19.2 mm² 3 x 6.4 |
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