SLVAFL5 September   2023 TPS61299

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction of Water Heater
  5. 2Low Voltage Start-up Boost Converter Introduction
    1. 2.1 General Introduction About TPS61299
    2. 2.2 Introduction about Traditional Start-up Process
    3. 2.3 Down Mode and Boost Mode Operation
  6. 3TPS61299 Ultra-low Voltage Start-up Design
    1. 3.1 Ultra Low Voltage Start-up Set up
    2. 3.2 The Way AVIN influence Start-up Process
    3. 3.3 The Way Vout Influence Start-up Process
    4. 3.4 The Way L Influence Start-up process
      1. 3.4.1 Why With the Larger Inductance, The Smaller PVIN Start-up Can Be Achieved?
      2. 3.4.2 Why Does The Inductance Continue to Increase, The Minimum PVIN to Start Up Is Not Lower
      3. 3.4.3 Why 80 mV Can Start Normally While 70 mV Fail to?
  7. 4Ultra-low Voltage Start-up Design
    1. 4.1 Test Waveform
  8. 5Summary
  9. 6References

3.1 Ultra Low Voltage Start-up Set up

Figure 2-2 shows the process to realize 150 mV low-voltage start-up based on TPS61299-103 EVM, where AVIN and PVIN are separated. The relative parameters are stated in Table 3-1.

Table 3-1 Parameters Set-up
Parameters Values
PVIN (SW) 150 mV
AVIN (VIN) 0.7 V
VOUT 3.3 V
L 1 uH
LOAD OPEN

The start up progress is shown in Figure 3-1.

GUID-20230828-SS0I-ZBBG-ZPVL-6TDCS7VBG8D7-low.png Figure 3-1 TPS61299 150 mV Input Voltage Start-up

In the following sections, elements such as AVIN, VOUT, and L are studied about how they influence the start up process.