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.
| Topology |
| Control Method |
| Duty Cycle (Max) (%) |
| Frequency (Max) (kHz) |
| UVLO Thresholds On/Off (V) |
| Regulated Outputs (#) |
| Special Features |
| Rating |
| Operating Temperature Range (C) |
| Pin/Package |
| Approx. Price (US$) |
| UCC3813-2 | UCC2813-2 |
|---|---|
| Boost Buck Flyback Forward | Boost Flyback Forward |
| Current | Current |
| 100 | 100 |
| 1000 | 1000 |
| 12.5/8.3 | 12.5/8.3 |
| 1 | 1 |
| Error Amplifier Leading Edge Blanking Soft Start | Error Amplifier Leading Edge Blanking Soft Start |
| Catalog | Catalog |
| 0 to 70 | -40 to 85 |
| 8PDIP 8SOIC 8TSSOP | 8PDIP 8SOIC 8TSSOP |
| 0.99 | 1ku | 1.05 | 1ku |
| Sample & Buy | Sample & Buy |