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2 Description
The UCC28C56EVM-066 is a highly efficient primary-side controlled (using an AUX winding) flyback auxiliary
power supply for EV/HEV automotive power trains. The design provides 15.2-V
battery systems. It will deliver 40 W over the input voltage range from 125 V to 1000 V. The exact output
voltage is load dependent. From 40-V to 125-V input the design will supply 20 W. The EVM utilizes a 1700-V
silicon-carbide (SiC) MOSFET, making it ideal for 800-V battery systems.
The EVM is a 4-layer board with the top and bottom layers dedicated to signal and power routing. The two
inner layers are used only to route test points. In effect, this is a low-cost two-layer PCB. The controller and
it's associated power components are tightly compacted into a 50 mm x 86 mm area, highlighted by the
white rectangle show on the top silkscreen. Note, C1 is not included with the critical components because it's
considered to be part of the general VIN bypass capacitors in the system.
Every effort was made to use automotive qualified components. An automotive qualified 1700-V SiC MOSFET
is listed in the BOM. The flyback transformer should be automotive qualified with consultation from the given
transformer manufacturer.
SLUUCN1C – JUNE 2022 – REVISED DECEMBER 2022
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Figure 2-1. UCC28C56EVM-066, HVP066A, Top View
Figure 2-2. UCC28C56EVM-066, HVP066A, Bottom View
Copyright © 2022 Texas Instruments Incorporated
Using the UCC28C56EVM-066 High-Density 40-W Auxiliary Power Supply for
Description
, 40-W output for 800-V
TYP
800-V Traction Inverters
3
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