Automotive pre-buck and post-boost reference design using CAN discrete SBC

The TIDA-01428 reference design sequentially implements a 1A, wide input voltage 3.3V buck converter, followed by a compact low input voltage 5V fixed boost converter to power the Controller Area Network (CAN) physical layer interface. This design has been tested for CISPR 25 radiated emissions and conducted emissions using voltage methods, and for immunity to Bulk Current Injection (BCI) per ISO 11452-4 by operating CAN communications at 500KBPS. TIDA-01428 is an EMC-vetted power tree and CAN reference design that can be used in many automotive applications. A system basis chip (SBC) is an integrated circuit (IC) that combines several typical building blocks of a system, including transceivers, linear regulators, and switching regulators. While these integrated devices can provide size and cost savings in many applications, integrated devices do not work well in every situation. For applications where SBC is less suitable, a better approach is to build discrete implementations of the above building blocks to create a discrete SBC.

characteristic

• ● Wide input voltage, 3.3V fixed buck converter
• ● Low input voltage, 5V fixed boost converter
• ● Passed CISPR 25 Class 4 radiated emission test
• ● Passed CISPR 25 Class 4 radiated emission test
• ● Maintain stable 3.3V and 5V power supplies by reducing the battery input voltage to 4.3V
• ● Able to withstand load dump voltage up to 42V