TIDUF59 March   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 PFC Inductance Design
      2. 2.2.2 Configuration of CS pin in LMG3622
      3. 2.2.3 AHB Topology and the VCC Design
      4. 2.2.4 LMG2610 for AHB Topology
    3. 2.3 Highlighted Products
      1. 2.3.1 UCC28056
      2. 2.3.2 LMG3622
      3. 2.3.3 LMG2610
  9. 3Hardware, Test Requirements, and Test Results
    1. 3.1 Hardware
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Switching Waveform
        1. 3.3.1.1 Switching Waveform on the PFC Stage
        2. 3.3.1.2 Switching Waveform on the AHB Stage
      2. 3.3.2 Efficiency Test Result
      3. 3.3.3 Thermal Test Result
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 Layout Prints {Optional Section}
    2. 4.2 Tools
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

3.3.2 Efficiency Test Result

The efficiency result tested burn-in at 100% load conditions at room temperature for 30 minutes, then the load was decreased to 75%, 50%, 25% and 10% load in 5-minute increments to make the system stable. Read the input power by integrated the energy for 1 minute.

The test results at 28V are shown in Table 3-2 to Table 3-5.

Table 3-2 28V Efficiency Result at 115Vac Input
LOAD VOUT (V) IOUT (A) POUT (W) PIN(W) EFFICIENCY
100% 27.934 5.0093 139.93 148.18 94.43%
75% 27.935 3.7501 104.76 111.31 94.12%

50%

 27.938 2.4889 69.535 74.517 93.31%

25%

 27.939 1.2459 34.810 37.558 92.68%
10% 27.939 0.4959 13.856 15.306 90.53%
Average Efficiency 93.64%
Table 3-3 28V Efficiency Result at 230Vac Input
LOAD VOUT (V) IOUT (A) POUT (W) POUT (W) EFFICIENCY
100%

27.934

5.0093

139.93

146.31

95.64%

75%

 27.935

3.7501

104.76

110.03

95.21%

50%

 27.936

2.4891

69.535

73.715

94.33%

25%

 27.938

1.2460

34.810

37.144

93.72%

10%

 27.939

0.4959

13.856

15.135

91.55%

Average Efficiency

94.72%
Table 3-4 28V Efficiency Result at 115Vac Input (VPFC is set as 320V)
LOAD VOUT (V) IOUT (A) POUT (W) PIN (W) EFFICIENCY

100%

27.934

5.0093

139.93

147.83

94.66%

75%

 27.935

3.7501

104.76

110.70

94.63%

50%

 27.938

2.4890

69.538

74.253

93.65%

25%

 27.938

1.2459

34.808

37.825

92.02%

10%

 27.939

0.4968

13.881

15.604

88.96%

Average Efficiency

93.74%

Table 3-5 shows the efficiency test results at 28V and 90Vac input and full load.

Table 3-5 28V Efficiency Result at 90Vac Input
VPFC (V) VOUT (V) IOUT (A) POUT (W) PIN (W) EFFICIENCY

390V

27.934

5.0089

139.92

149.77

93.42%

320V

27.933

5.0095

139.93

149.47

93.62%

Figure 3-23 shows the 28V efficiency comparison curve.

GUID-20231208-SS0I-PMC7-J6CK-ZWW8BNN5GWDC-low.png Figure 3-23 Efficiency Result at VOUT = 28V

Table 3-6 and Table 3-7 shows the test results at 20V.

Table 3-6 20V Efficiency Result at 115Vac Input

LOAD

VOUT (V)

IOUT (A)

POUT (W)

PIN (W)

EFFICIENCY

100%

20.060

4.9960

100.22

106.730

93.90%

75%

 20.060

3.7509

75.244

80.339

93.66%

50%

 20.063

2.4898

49.953

53.836

92.79%

25%

 20.063

1.2468

25.015

27.187

92.01%

10%

 20.064

0.4968

9.969

11.068

90.07%

Average Efficiency

93.09%
Table 3-7 20V Efficiency Result at 230Vac Input

LOAD

VOUT (V)

IOUT (A)

PIN (W)

POUT (W)

EFFICIENCY

100%

20.060

4.9950

100.200

 105.500

94.98%

75%

 20.060

3.7512

75.249

 79.464

94.70%

50%

 20.061

2.4910

49.971

 53.278

93.79%

25%

 20.061

1.2469

25.014

 26.894

93.01%

10%

 20.061

0.4969

9.968

 10.783

92.44%

Average Efficiency

94.12%

Figure 3-24 shows the 20V efficiency comparison curve.

GUID-20231208-SS0I-DXRX-7GMZ-RN2ZVSNGHMVL-low.png Figure 3-24 Efficiency Result at VOUT = 20V

Table 3-8 and Table 3-9 show the test results at 15V.

Table 3-8 15V Efficiency Result at 115Vac Input
LOAD VOUT (V) IOUT (A) POUT (W) PIN (W) EFFICIENCY

100%

15.121

5.0114

75.778

81.572

92.90%

75%

15.124

3.7509

56.728

61.308

92.53%

50%

15.125

2.4909

37.675

40.949

92.00%

25%

 15.125

1.2469

18.859

20.692

91.14%

10%

 15.125

0.4969

7.515

8.527

88.13%

Average Efficiency

92.14%
Table 3-9 15V Efficiency Result at 230Vac Input
LOAD VOUT (V) IOUT (A) POUT (W) PIN (W) EFFICIENCY

100%

15.123

5.0117

75.792

80.679

93.94%

75%

 15.123

3.7518

56.738

60.662

93.53%

50%

 15.125

2.4907

37.672

40.469

93.09%

25%

 15.125

1.2477

18.872

20.467

92.21%

10%

 15.121

0.4969

7.513

8.226

91.34%

Average Efficiency

93.19%

Figure 3-25 shows the 15V efficiency comparison curve.

GUID-20231208-SS0I-K3ZT-BB5W-TGSF5WDBNVHR-low.png Figure 3-25 Efficiency Result at VOUT = 15V

Table 3-10 and Table 3-11 show the test results at 9V.

Table 3-10 9V Efficiency Result at 115Vac Input
LOAD VOUT (V) IOUT (A) POUT (W) PIN (W) EFFICIENCY

100%

9.0925

2.9991

27.269

29.639

92.00%

75%

 9.0925

2.2490

20.449

22.422

91.20%

50%

 9.0938

1.4986

13.628

14.953

91.14%

25%

 9.0938

0.7488

6.809

7.689

88.56%

10%

 9.0925

0.2987

2.716

3.037

89.73%

Average Efficiency

90.73%
Table 3-11 9V Efficiency Result at 230Vac Input
LOAD VOUT (V) IOUT (A) POUT (W) PIN (W) EFFICIENCY

100%

9.0925

2.9992

27.270

29.398

92.76%

75%

 9.0925

2.2491

20.450

22.078

92.63%

50%

 9.0925

1.4988

13.628

14.972

91.02%

25%

 9.0938

0.7490

6.811

7.826

87.03%

10%

 9.0913

0.2989

2.718

3.152

86.20%

Average Efficiency

90.86%

Figure 3-26 shows the 9V efficiency comparison curve.

GUID-20231208-SS0I-R0Q1-WNGW-FVCWGPRDJTJ5-low.png Figure 3-26 Efficiency Result at VOUT = 9V

Table 3-12 and Table 3-13 show the test results at 5V.

Table 3-12 5V Efficiency Result at 115Vac Input
LOAD VOUT (V) IOUT (A) POUT (W) PIN (W) EFFICIENCY

100%

5.1688

2.9997

15.505

16.999

91.21%

75%

5.1700

2.2495

11.630

12.816

90.75%

50%

 5.1700

1.4992

7.751

8.698

89.12%

25%

5.1663

0.7474

3.862

4.540

85.06%

10%

5.1688

0.2993

1.547

1.867

82.89%

Average Efficiency

89.03%
Table 3-13 5V Efficiency Result at 230Vac Input
LOAD VOUT (V) IOUT (A) POUT (W) PIN (W) EFFICIENCY

100%

 5.1700

2.9988

15.504

17.021

91.09%

75%

 5.1700

2.2493

11.629

13.304

87.41%

50%

 5.1700

1.4989

7.7492

8.9764

86.33%

25%

 5.1700

0.7490

3.8722

4.8724

79.47%

10%

5.1688

0.2989

1.5448

1.9854

77.81%

Average Efficiency

86.07%

Figure 3-27 shows the 5V efficiency comparison curve.

GUID-20231208-SS0I-DGR7-GFMK-ZSJP60KCLKW7-low.png Figure 3-27 Efficiency Result at VOUT = 5V
GUID-20231208-SS0I-TCSM-LHM9-88DVZ02H06PV-low.png Figure 3-28 Average Efficiency Result of 4 points