High-Power Density Reference Design for Automotive Vehicle-to-Everything (V2X) Power

1 Description

This reference design provides the system rails for automotive vehicle-to-everything power. A 5-V bus is generated by the off-battery buck converter (LM63625-Q1), and this supplies all the point-of-load devices. The bus converter switches at 2.1 MHz, and the load converters (TPS628501-Q1) switch at 2.2 MHz. Easily-configurable jumpers allow users to enable and disable each device on the board and toggle the bus converter operational modes. A front-end EMI filter is included.

Figure 1-1 Board Top

Figure 1-2 Board Bottom

2 Test Prerequisites

2.1 Voltage and Current Requirements

Table 2-1 Voltage and Current Requirements for
5-V Output (DC/DC)

PARAMETER	SPECIFICATIONS
Input Voltage	6 to 16 V (13.5 V nominal)
Output Voltage	5 V
Output Current	2.4 A
Switching Frequency	2.1 MHz

Table 2-2 Voltage and Current Requirements for
3.3-V Output (DC/DC)

PARAMETER	SPECIFICATIONS
Input Voltage	5 V
Output Voltage	3.3 V
Output Current	0.2 A
Switching Frequency	2.2 MHz

Table 2-3 Voltage and Current Requirements for
1.8-V Output (DC/DC)

PARAMETER	SPECIFICATIONS
Input Voltage	5 V
Output Voltage	1.8 V
Output Current	0.3 A
Switching Frequency	2.2 MHz

Table 2-4 Voltage and Current Requirements for 1.35-V Output (DC/DC)

PARAMETER	SPECIFICATIONS
Input Voltage	5 V
Output Voltage	1.35 V
Output Current	0.2 A
Switching Frequency	2.2 MHz

Table 2-5 Voltage and Current Requirements for 1.175-V Output (DC/DC)

PARAMETER	SPECIFICATIONS
Input Voltage	5 V
Output Voltage	1.175 V
Output Current	2 A
Switching Frequency	2.2 MHz

Table 2-6 Voltage and Current Requirements for
3.3-V Output (LDO)

PARAMETER	SPECIFICATIONS
Input Voltage	5 V
Output Voltage	3.3 V
Output Current	10 mA
Switching Frequency	N/A

2.2 Considerations

Unless stated otherwise, tests were performed with a 13.5-V input. The input supply was connected to the input of the EMI filter (instead of being directly connected to the input of the converter). For all tests, an electronic load was used, unless stated otherwise.