SLUUCC3 february   2021 BQ79631-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4.   General Texas Instruments High Voltage Evaluation (TI HV EVM) User Safety Guidelines
  5. 1General Description
    1. 1.1 Key Features
      1. 1.1.1 Key Electrical Parameters
  6. 2Theory of Operation
    1. 2.1 Single Board
    2. 2.2 Stacked Systems
  7. 3Connectors
    1. 3.1 Powering the BQ79631EVM
    2. 3.2 Primary Input and Output Connectors
      1. 3.2.1 Jumper Placements
      2. 3.2.2 Host Interface
      3. 3.2.3 High-Side and Low-Side Communications
    3. 3.3 High Voltage Networks
      1. 3.3.1 High Voltage Safety Considerations
      2. 3.3.2 High Voltage Connections
      3. 3.3.3 High Voltage Alternatives
      4. 3.3.4 Switches
      5. 3.3.5 Buffers
      6. 3.3.6 Insulation Detection Network
    4. 3.4 Current Sense
      1. 3.4.1 SRP/SRN
      2. 3.4.2 VCSamp_Out
    5. 3.5 GPIO Connections
  8. 4Quick Start Guide
    1. 4.1 Launch Pad Connection and Example Code
      1. 4.1.1 Required Devices for Using the Example Code
      2. 4.1.2 Power Connections
      3. 4.1.3 Connecting the EVM to the TMS570 LaunchPad
      4. 4.1.4 Software
    2. 4.2 USB2ANY Connection with GUI
      1. 4.2.1 GUI
      2. 4.2.2 GUI UART Connection
  9. 5Physical Dimensions
    1. 5.1 Board Dimensions
  10. 6BQ79631-Q1 EVM Schematic, Assembly, Layout, and BOM
    1. 6.1 Schematics
    2. 6.2 Layout
    3. 6.3 Bill of Materials

3.3.5 Buffers

Prior to the VC measurements in the positive side of each high voltage network (not HV_Extra1_Plus or HV_Extra2_Plus), there is a buffer present to prevent leakage current from flowing back into VC pins. This leakage current creates inaccuracy in the measurements made by the VC pins. While TI recommends that these buffers are implemented in the user’s final design for accuracy, if the user wishes to assess impact on accuracy without the buffer, the user can connect to the first pin of the jumper associated with each buffer as shown below. Simply compare the measurement obtained by connecting a DMM to the desired jumper and GNDHV with the measurement seen on the VC pin associated with that network to calculate the percent error that is introduced if a buffer were not to be included in the user’s final design.

GUID-20200717-CA0I-CQDZ-FSVX-VRXLXDRW9LBG-low.png Figure 3-5 Buffer Bypass Jumpers
Table 3-8 Bypass Jumpers
Jumper Network
J35 HV_Plus
J33 HV_Fuse
J34 LINK_Plus
J4 Charge_Plus