ZHCSKY4B November   2018  – December 2020 TPS55288

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 I2C Timing Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  VCC Power Supply
      2. 7.3.2  Operation Mode Setting
      3. 7.3.3  Input Undervoltage Lockout
      4. 7.3.4  Enable and Programmable UVLO
      5. 7.3.5  Soft Start
      6. 7.3.6  Shutdown and Load Discharge
      7. 7.3.7  Switching Frequency
      8. 7.3.8  Switching Frequency Dithering
      9. 7.3.9  Inductor Current Limit
      10. 7.3.10 Internal Charge Path
      11. 7.3.11 Output Voltage Setting
      12. 7.3.12 Output Current Monitoring and Cable Voltage Droop Compensation
      13. 7.3.13 Integrated Gate Drivers
      14. 7.3.14 Output Current Limit
      15. 7.3.15 Overvoltage Protection
      16. 7.3.16 Output Short Circuit Protection
      17. 7.3.17 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 PWM Mode
      2. 7.4.2 Power Save Mode
    5. 7.5 I2C Serial Interface
      1. 7.5.1 Data Validity
      2. 7.5.2 START and STOP Conditions
      3. 7.5.3 Byte Format
      4. 7.5.4 Acknowledge (ACK) and Not Acknowledge (NACK)
      5. 7.5.5 Slave Address and Data Direction Bit
      6. 7.5.6 Single Read and Write
      7. 7.5.7 Multi-Read and Multi-Write
    6. 7.6 Register Maps
      1. 7.6.1 REF Register (Address = 0h, 1h) [reset = 11010010h, 00000000h]
      2. 7.6.2 IOUT_LIMIT Register (Address = 2h) [reset = 11100100h]
      3. 7.6.3 VOUT_SR Register (Address = 3h) [reset = 00000001h]
      4. 7.6.4 VOUT_FS Register (Address = 4h) [reset = 00000011h]
      5. 7.6.5 CDC Register (Address = 5h) [reset = 11100000h]
      6. 7.6.6 MODE Register (Address = 6h) [reset = 00100000h]
      7. 7.6.7 STATUS Register (Address = 7h) [reset = 00000011h]
      8. 7.6.8 Register Summary
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 USB PD Power Supply Detailed Design Procedure
        1. 8.2.2.1 Switching Frequency
        2. 8.2.2.2 Output Voltage Setting
        3. 8.2.2.3 Inductor Selection
        4. 8.2.2.4 Input Capacitor
        5. 8.2.2.5 Output Capacitor
        6. 8.2.2.6 Output Current Limit
        7. 8.2.2.7 Loop Stability
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 第三方产品免责声明
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 静电放电警告
    6. 11.6 术语表
  12. 12Mechanical, Packaging, and Orderable Information

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7.6.1 REF Register (Address = 0h, 1h) [reset = 11010010h, 00000000h]

REF is shown in Figure 7-15 and Figure 7-16 described in Table 7-4.

Return to Summary Table.

REF sets the internal reference voltage of the TPS55288. The 01h register is the high byte and the 00h register is the low byte. One LSB of register 00h stands for 1.129 mV of the internal reference voltage. The default register value is 00000000 11010010b of 282 mV. When the register value is 00000000 00000000b, the reference voltage is 45 mV. When the register value is 00000011 11000000b, the reference voltage is 1.129 V. The output voltage of the TPS55288 also depends on the output feedback ratio, which is either set in register 04h or set by an external resistor divider.

Writing register 01h enables the TPS55288 to load the 01h and 00h data into the internal 10-bit DAC. Writing the register 00h does not impact the internal reference voltage.
Figure 7-15 REF_LSB
7 6 5 4 3 2 1 0
VREF
R/W-11010010b
Figure 7-16 REF_MSB
15 14 13 12 11 10 9 8
Reserved VREF
R/W-000000b R/W-00b
Table 7-4 REF Register Field Descriptions
Bit Field Type Reset Description
15-10 Reserved R/W 000000b Reserved
9-0 VREF R/W 00 11010010b Sets the internal reference voltage
00 00000000b = 45-mV reference voltage
00 00000001b = 46.129-mV reference voltage
00 00000010b = 47.258-mV reference voltage
...... = ......
00 11010010b = 282-mV reference voltage (Default)
...... = ......
01 10011010b = 508-mV reference voltage
...... = ......
10 11000110b = 846-mV reference voltage
...... = ......
11 11000000b = 1129-mV reference voltage
...... = ......
11 11111111b = 1200-mV reference voltage