SLVAFU0 April   2024 TPS61377

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Analysis of Dual Polarity Voltage Rails Design With Boost Converter
    1. 2.1 Analysis of Factors Affecting Negative Voltage Rail
    2. 2.2 Improvement of Gap Between Negative Voltage Rail and Positive Voltage Rail
  6. 3Boost Converter ± Quick Calculator Design
  7. 4Demo and Test
    1. 4.1 Simulation Results
    2. 4.2 Demo Board Example
  8. 5Summary
  9. 6References

4.1 Simulation Results

Simulation uses the Table 4-1 test parameters to analyze the function of R3 in Figure 4-1.

Table 4-1 Test Parameters
Test parameters
Input voltage 12V
Output voltage ± 19V
Output load ± 500mA

Table 4-2 shows the gap between with using R3 and without using R3. R3 can effectively eliminate the DC offset using the architecture.

Table 4-2 Gap With and Without Using R3
IOUT1/2 (A) R3=2.32ohm, Gap(V) R3 = 0ohm, Gap(V)
0 0.0000 0.0000
0.1 -0.0005 0.41
0.2 -0.0010 0.82
0.3 -0.0015 1.22
0.4 -0.0021 1.63
0.5 -0.0024 2.04
GUID-7F8C28E0-3258-4E56-B3B4-8CFB5A3DDDA8-low.png Figure 4-1 Gap With and Without Using R3