SLVUCI9 November   2023 TPS61289

 

  1.   1
  2.   TPS61289EVM-113 Evaluation Module
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Performance Specification
    2. 1.2 Modification
  5. 2EVM Configuration
    1. 2.1 EVM Top View and Circuit Layout Partitions
    2. 2.2 Connector, Test Point and Jumper Descripitions
      1. 2.2.1 Connector and Test Point Description
      2. 2.2.2 Jumper Configuration
  6. 3Test Procedure
    1. 3.1 Bench Setup
    2. 3.2 Boost Mode or Battery Discharge Mode Test Procedure
      1. 3.2.1 Power up and Power down Sequence
      2. 3.2.2 Test Waveform
    3. 3.3 Buck Mode or Battery Charge Mode Test Procedure
      1. 3.3.1 Power-up and Power-down sequence
      2. 3.3.2 Test Waveform
    4. 3.4 Operating the EVM with USB2ANY
      1. 3.4.1 Install USB2ANY Explorer
      2. 3.4.2 USB2ANY Connection
      3. 3.4.3 USB2ANY Interface Introduction
      4. 3.4.4 Test Procedure with USB2ANY
  7. 4Schematic, Bill of Materials, and Board Layout
    1. 4.1 Schematic
    2. 4.2 Bill of Materials
    3. 4.3 Board Layout
  8. 5Revision History

3.3.1 Power-up and Power-down sequence

1. Set up the bench as shown in Figure 4-16.

2. Refer to the jumper setting described in Table 2-2.

JP1 needs to be set as Enabled.

JP2 needs to be set as Buck Mode.

JP3 needs to be default.

JP4 needs to be set all open for the external current reference setting.

JP5 needs to be set all open for the external voltage reference setting.

The EVM provides a sight negative voltage bias on the current reference to disable the switching when current setting is 0 V. When the device starts switching, the relationship between actually charge current and current setting is shown in Equation 2.

Equation 2. I c h a r g e ( A ) = 5 ( I s e t ( V ) × 0.987 - 0.064 )

The voltage reference setting is the constant voltage charge target, as in Equation 3.

Equation 3. V c h a r g e _ t a r g e t ( V ) = V s e t ( V )

3. Set PS-High to 15 V and PS-Low to 3.6 V and turn on.

4. Set E-Load-Low to CC mode 20 A and turn on.

5. Set the voltage setting Vset, the voltage must be higher than voltage of PS-Low(3.6 V).

6. Set the current setting Iset, the converter starts switching when the comp voltage reaches 0.65 V typically.

7. Perform the test.

8. The charging mode automaticly charges from constant current to constant voltage when battery voltage is close to voltage setting.

9. After all the tests are done, the converter can be disabled by setting the EN pin to Low.

10. Turn off all the power supplies and E-loads.