ZHCU741 July   2020

 

  1.   说明
  2.   资源
  3.   特性
  4.   应用
  5.   5
  6. 1System Description
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 PCB Assembly
      2. 2.2.2 Top Side of PCB Assembly
    3. 2.3 Highlighted Products
      1. 2.3.1 TPS92682-Q1
      2. 2.3.2 TPS92682-Q1
      3. 2.3.3 TPS92520-Q1
      4. 2.3.4 MSP432
      5. 2.3.5 System Design Theory
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 CISPR 25 Class 5 Test Setup
      2. 3.1.2 LED Load Board Top
      3. 3.1.3 LED Load Board Bottom
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1  Boost Turn on Delay
      2. 3.3.2  Highbeam/Lowbeam Turn on Delay
      3. 3.3.3  Highbeam/Lowbeam Switch Node and Ripple Current
      4. 3.3.4  Turn Indicator Turn on Delay
      5. 3.3.5  Turn Indictor Turn Off Delay
      6. 3.3.6  Turn Indicator 1.5 Hz Operation
      7. 3.3.7  Turn Indicator Output Voltage and Current
      8. 3.3.8  Daytime Running Light Turn-on Delay
      9. 3.3.9  Daytime Running Light Switch Node and Output Current
      10. 3.3.10 Highbeam/Lowbeam LED Short
      11. 3.3.11 Highbeam/Lowbeam Fault Indicator
      12. 3.3.12 Turn Indicator Fault Output
      13. 3.3.13 TPS92682-Q1 Boost and SEPIC Interleaving
      14. 3.3.14 TIDA-050040 Full Load Efficiency
      15. 3.3.15 Efficiency Highbeam/Lowbeam
      16. 3.3.16 Efficiency Turn Indicator and Daytime Running Light
      17. 3.3.17 Efficiency Highbeam/Lowbeam and Turn Indicator
      18. 3.3.18 CISPR 25 Class 5 EMI Scan
      19. 3.3.19 Top Side Thermal Image DRL at 15W
      20. 3.3.20 Bottom side thermal image DRL at 15W
      21. 3.3.21 Top Side Thermal Image Highbeam/Lowbeam at 30W, Turn Indicator at 7.5W average
      22. 3.3.22 Bottom Side Thermal Image Highbeam/Lowbeam at 30W, Turn Indicator at 7.5W average
  9. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks

Hardware, Software, Testing Requirements, and Test Results

This reference design includes software for the MSP432 to program the TPS92682-Q1 and TPS92520-Q1 registers via SPI bus. The MSP432 software also determines Highbeam/Lowbeam, Turn Indicator and Day Time Running Light/Position Marker Light function from three power inputs and a Highbeam input signal. Functional operation and Faults are determined by reading binning resistors, NTC inputs and LED string voltages. Single LED fault detection for Highbeam/Lowbeam and Turn Indicator are determined by monitoring their output voltage. Reliablity of detection can be improved by adding first turn on calibration and adding a load temperature, load current and LED string voltage table.

The TPS92682-Q1 register settings include the following:

Table 3-1 TPS92682-Q1 and TPS92520-Q1 SPI Register Read and Write Values

TPS92682-Q1 SPIREGISTER ADDRESS

TPS92682-Q1 SPIREGISTER VALUE

COMMENT

TPS92520-Q1 SPI REGISTER ADDRESS

TPS92520-Q1 SPI REGISTER VALUE

COMMENT

Read Status Register

Read Status Register

0x11

0x00

0x03

0x00

0x12

0x00

0x04

0x00

Write 682 Registers

0x05

0x00

0x01

0x01

Write 520 Registers

0x02

0x00

0x00

0x00

0x03

0x00

0x01

0x00

0x04

0x25

0x02

0x08

ox05

0x0F

0x06

0x8A

0x06

0xFF

0x07

0x00

0x07

0xE7

Sets Boost Output to 55V

0x09

0x07

Sets LB/HB Current Low

0x08

0x0C

Sets SEPIC Current Low

0x08

0x00

Sets LB/HB Current Low

0x08

0x2B

Sets SEPIC Full Power

0x09

0x82

Sets LB/HB Full Power

0x09

0x41

0x08

0x00

Sets LB/HB Full Power

0x0B

0x0E

0x20

0x03

0x0A

0x02

0x21

0x6A

0x0D

0x00

0x0B

0x0E

Sets TI Current Low

0x0C

0x00

0x0A

0x02

Sets TI Current Low

0x0E

0x0F

SET ILIM

0x0B

0x41

Sets TI Full Power

0x0F

0x0A

0x0A

0x00

Sets TI Full Power

0x10

0x99

0x0C

0x07

0x13

0x3C

0x0E

0x00

0x14

0x2F

0x0D

0x40

0x15

0x00

0x100x00

0x16

0x44

0x0F0x40

0x17

0x3C

0x110x06Set fsw LB/HB
0x120x07Set fsw TI
0x1E0x00
0x1F0x00
0x220x00
0x230x10
0x240x00
0x250x10

0x26

0x00

0x27

0x00

0x28

0x00

0x29

0x00

0x2A

0x07

0x2B

0x07

0x2C

0x80

MSP432 is programmed via JTAG, connector J3.