UCC28630EVM-572: 19.5V @ 3.34A, 65W, 90 ~ 265VAC in

The UCC28630EVM-572 evaluation module is a 65-W nominal, 130-W peak off-line flyback converter. It provides constant-voltage (CV) and constant-current (CC) output regulation using the bias winding to sense a scaled proportion of the output voltage and the primary current sense resistor to sense a scaled version of the secondary current. Output voltage regulation within 1% is maintained down to no-load by reducing the switching frequency and the device bias current consumption.

This evaluation module uses the UCC28630 High-Power Flyback Controller with Primary-Side Regulation and Peak-Power Mode in a 65-W converter to provide a regulated output voltage of 19.5 V. The input accepts a voltage range of 90 VAC to 265 VAC. The output is designed for 19.5 V when in constant voltage mode and 3.34-A nominal output current.

The EVM transiently delivers ~7 A of constant charge down to an output voltage of ~12 V. The unit can only transiently operate at > 140% of the nominal output power. The operation of the overload timer is explained in detail in the UCC28630 datasheet. Sustained operation above this power level causes the device to inhibit switching and enter hiccup fault mode until the overload is removed.

The modulation of peak current and frequency results in excellent no-load power (<70 mW), no audible noise and small core size to deliver the 130-W peak power.

The UCC28630 also employs frequency dithering to reduce conducted emissions and therefore reduce the size and cost of the EMI filter.

This user’s guide provides the schematic, component list, assembly drawing, art work, and test set up necessary to evaluate the UCC28630EVM-572.