This reference design uses four, UCC12050 High-Efficiency, Low-EMI, 5-kVRMS Reinforced Isolation, DC-DC Converters on a single printed circuit board. The reference design includes additional provisions such as ferrite beads for optimized low-EMI emissions. Output voltages, VISO, can be selected for 3.3 V, 3.7 V, 5 V (default) and 5.4 V. Each of the four outputs includes a 100-mA, 500-mW load resistor commanding maximum output power by default but can easily be changed to accommodate any desired output load, up to 500 mW for any single converter. A single SMB input connector (J3) is included to allow easy and convenient connection to the input voltage source through a shielded input cable. The primary intent of this reference design is to investigate the impact that multiple high frequency converters have on EMI according to the CISPR 32, class B test standard. Applications include isolated bias supplies for isolated data converters, amplifiers and motor drivers used in industrial, factory automation and grid infrastructure systems.
The UCC12050 is a fully-integrated, DC/DC converter with 5-kVRMS reinforced isolation rating designed to provide efficient power to isolated circuits that require a bias supply with a well-regulated output voltage. The device integrates a transformer and DC/DC controller with a proprietary architecture to provide 500 mW of isolated power with high efficiency and low EMI.
The UCC12050 integrates protection features for increased system robustness. The device also includes an enable pin, synchronization capability, and a user selectable, regulated 3.3-V, 3.7-V, 5-V, or 5.4-V output option. The UCC12050 is a low-profile, miniaturized solution offered in a wide-body SOIC package with > 8-mm creepage and clearance. Additional information is found in the UCC12050 High-Efficiency, Low-EMI, 5-kVRMS Reinforced Isolation DC-DC Converter Data Sheet.
Start-up shown is for a single output (ISO OUTPUT 1), VINP = 5 V, VISO = 5 V, POUT = 500 mW, start-up begins 492 µs after EN is HIGH.