The UCC3888 is a non-isolated controller for switch mode power supplies and battery chargers. It achieves high efficiency and low cost conversion by using two cascaded flyback converters. The UCC3888 switch frequency can be externally programmed from 200kHz to 500kHz and has an integrated synchronous rectifier.
This document is a datasheet for the Unitrode UCC1888, UCC2888, and UCC3888 series of off-line power supply controllers. These devices are optimized for use as off-line, low power, low voltage, regulated bias supplies utilizing a unique transformerless circuit topology.
| Input Voltage Range | 100VDC to 400VDC |
|---|---|
| Output Voltage (Fixed) | 5VDC |
| Output Current (Sink) | 200mA |
| Operating Temperature (UCC1888) | -55°C to +125°C |
| Operating Temperature (UCC2888) | -40°C to +85°C |
| Operating Temperature (UCC3888) | 0°C to 70°C |
It is optimized for use as an off-line, low power, low voltage, regulated bias supply.
No, it can achieve voltage conversion ratios as high as 400V to 2.7V with no transformer.
The device includes inherent short circuit protection and optional isolation capability.
The output voltage is set internally to 5V, but can be programmed for other output voltages with two external resistors.