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Part Number: TCAN4550
A customer would like to connect a 5V supply to VCCOUT to bypass the VSUP because VSUP will require another regulator with output between 6V-24v. Using 5V will simplify the design, reduce cost and save PCB space. From the datasheet, VSUP voltage should be higher than 5.5V to prevent triggering UVLO and shutdown the CAN. Will there be other complications that could happen with this design? Please refer to the block diagram below.
This actually will work as long as you pass the UVLO threshold on VSUP, which on first power up needs to be 6V, and then can be brought down to 5.5V. And VCCOUT must be forced to 5.2V, it needs to be slightly higher than 5V.
In this way the VSUP supply to the internal LDO is bypassed and the 5.2V to the VCCOUT pin is used to supply the CAN transceiver portion of the device.
Please let me know if you have any other quesitons.
Texas Instruments | INT-TRX| Applications Engineer
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