TIDUF23 may 2023
The 5-Volt power supply features LMR50410-Q1 Simple Switcher®. The power supply mainly powers the MCU control card plugged into the HSEC PCB connector.
LMR50410-Q1 has maximum output current of 1 A which gives power budget of 10 W. At efficiency of 90% it draws about 0.92A from the 12-Volt power rail at maximum power. Realistic estimate of the load current in all branches is shown in Figure 2-5.
Out of assumed MCU control cards, the AM2634 control card consumes higher power so the sizing of the power budget is based on the consumption estimate of AM2634 control card.
The AM2634 based control card consumes in average 2.5 W with all unused peripherals disabled. The 5-volt power supply domain then offers sufficient margin to support various use cases and operation profiles.
CAN interface consumes 70 mA and the isolated CAN 122 mA totaling 192 mA from 5-volt rail. The isolated CAN interface is powered using UCC12051-Q1 DC/DC power module. This module provides maximum 500 mW of power at 5 V and 5 kVrms isolation. At 73 mA loading on the isolated side by the ISOCAN1042-Q1 we expect 122 mA on the primary side assuming 60% efficiency.