UCC3857 is a controller for isolated boost PFC converter.
The Unitrode UCC1857, UCC2857, and UCC3857 are isolated boost PFC preregulator controllers designed for applications requiring high efficiency and integration. These devices provide all necessary control functions for an isolated boost PFC converter, including transformer isolation between primary and secondary and an output bus voltage lower than the input voltage.
| Supply Current (Active, No Load) | 3.5 mA |
|---|---|
| Supply Current (Startup, No Load) | 60 mA |
| Reference Output Voltage | 7.5 V |
| Oscillator Frequency (Typical) | 50 kHz |
| Operating Temperature Range (UCC1857) | -55°C to +125°C |
| Package Types | 20-Pin DW, N, J, and L Packages |
The UCC3857 provides all control functions necessary for an isolated Boost PFC Converter.
It provides overlapping drive signals for external IGBT switches and a separate output to drive an external power MOSFET.
The typical reference output voltage is 7.5V.