SLUUC53A October   2020  – March 2021 BQ25300 , BQ25302 , BQ25303J

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 I/O Descriptions
  3. 2Test Setup and Results
    1. 2.1 Equipment
    2. 2.2 Equipment Setup
    3. 2.3 Test Procedure
      1. 2.3.1 Initial Settings
      2. 2.3.2 Precharge Mode Verification
      3. 2.3.3 Fast Charge Mode Verification
      4. 2.3.4 Battery Temperature Monitoring Verification
      5. 2.3.5 Evaluation Results
      6. 2.3.6 Helpful Tips
  4. 3PCB Layout Guideline
  5. 4Board Layout, Schematic, and Bill of Materials
    1. 4.1 Board Layout
    2. 4.2 Schematic
    3. 4.3 Bill of Materials
  6. 5Revision History

2.3.6 Helpful Tips

  1. BQ2530XEVM is configured by default to operate with TS in normal range. If external thermistor is available, connect external thermistor at J1(2)-EXT_TS and J1(1)-PGND, and remove R14.
  2. The leads and cables to the various power supplies, batteries and loads have resistance. The current meters also have series resistance. The charger dynamically reduces charge current depending on the voltage sensed at its VBUS pin (using the VINDPM feature), BAT pin (as part of normal termination), and TS pin (through its battery temperature monitoring feature via battery thermistor). Therefore, voltmeters must be used to measure the voltage as close to the IC pins as possible instead of relying on the digital readouts of the power supply.
  3. When using a source meter that can source and sink current as your battery simulator, TI highly recommends adding a large (1000+ μF) capacitor at the EVM BATTERY and GND connectors in order to simulate a real battery. Configuring the source meter for 4-wire sensing eliminates the need for a separate voltmeter to measure the voltage at the BAT pin.
    When using 4-wire sensing, always ensure that the sensing leads are connected in order to prevent accidental overvoltage by the power leads.