SLVT229 December   2025

 

  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 High Side Gate Drive Circuit
      2. 2.2.2 PWM Generation Circuit
    3. 2.3 Highlighted Products
      1. 2.3.1 UCC21330-Q1 Overview
      2. 2.3.2 UCC27211A-Q1 Overview
      3. 2.3.3 TPS1212-Q1 Overview
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
      1. 3.3.1 Efficiency Data
      2. 3.3.2 Efficiency Graphs
      3. 3.3.3 Output Voltage Ripple
      4. 3.3.4 Thermal Images
      5. 3.3.5 Switch Voltage Stress of High Side Switches
      6. 3.3.6 Load Transients
      7. 3.3.7 Reverse Step-up Operation of SCC
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 PCB Layout Recommendations
    2. 4.2 Documentation Support
    3.     Trademarks

3.3.1 Efficiency Data

Efficiency data is shown in Table 3-1. Test condition is room temperature, no air flow. Note that the power stage efficiency is calculated with the bias power excluded, while the overall efficiency is calculated with the bias power included.

Table 3-1 Efficiency at 36Vin, Conversion Ratio = 4:1
Vbias Ibias Vin Iin Vout Iout Pin Pbias Pout Ploss Overall Efficiency Power Stage Efficiency
10.89 0.21 36.00 0.048 8.994 0.000 1.74 2.29 0.00 1.74 0.00% 0.00%
10.89 0.21 36.00 0.301 8.988 1.006 10.84 2.29 9.04 1.79 70.24% 80.90%
10.89 0.21 36.00 0.549 8.982 2.006 19.77 2.29 18.02 1.75 82.44% 89.46%
10.89 0.21 35.99 0.798 8.976 3.006 28.72 2.29 26.98 1.74 87.62% 92.82%
10.89 0.21 35.99 1.053 8.970 4.030 37.91 2.29 36.15 1.76 90.64% 94.75%
10.89 0.21 35.99 1.302 8.964 5.031 46.86 2.29 45.10 1.76 92.23% 95.66%
10.89 0.21 35.99 1.550 8.958 6.019 55.78 2.29 53.92 1.87 93.29% 96.21%
10.89 0.21 35.99 1.798 8.952 7.019 64.72 2.29 62.83 1.89 94.07% 96.64%
10.89 0.21 35.99 2.047 8.945 8.017 73.67 2.29 71.71 1.96 94.76% 97.04%
10.89 0.21 35.99 2.294 8.939 9.016 82.58 2.29 80.59 1.98 95.31% 97.37%
10.96 0.22 35.99 2.549 8.935 10.040 91.73 2.41 89.71 2.03 95.69% 97.57%
10.96 0.23 36.00 3.787 8.910 15.028 136.31 2.52 133.90 2.41 96.95% 98.27%
10.96 0.23 36.00 5.032 8.883 20.046 181.13 2.52 178.07 3.07 97.46% 98.49%
10.95 0.24 36.00 6.276 8.853 25.062 225.92 2.63 221.87 4.05 97.67% 98.50%
10.95 0.24 36.00 7.520 8.823 30.087 270.73 2.63 265.46 5.28 97.83% 98.54%
10.95 0.24 36.00 8.764 8.791 35.106 315.51 2.63 308.62 6.90 97.83% 98.45%
10.95 0.25 36.00 10.000 8.759 40.096 360.00 2.74 351.20 8.80 97.78% 98.33%
10.95 0.25 36.00 11.243 8.724 45.112 404.75 2.74 393.56 11.19 97.70% 98.19%
10.95 0.25 36.00 12.487 8.722 50.131 449.53 2.74 437.24 12.29 97.56% 98.00%
10.95 0.25 36.00 13.732 8.720 55.153 494.35 2.74 480.93 13.42 97.42% 97.82%
10.95 0.25 36.00 14.974 8.694 60.168 539.06 2.74 523.10 15.96 97.27% 97.63%
10.95 0.25 36.00 16.217 8.680 65.187 583.81 2.74 565.82 17.99 97.10% 97.43%
10.95 0.25 36.00 17.456 8.663 70.178 628.42 2.74 607.95 20.46 96.32% 96.74%
10.95 0.25 36.00 18.697 8.635 75.196 673.09 2.74 649.32 23.77 96.08% 96.47%
10.82 0.22 36.00 19.934 8.579 80.215 717.62 2.38 688.16 29.46 95.58% 95.89%
Table 3-2 Efficiency at 48Vin, Conversion Ratio = 4:1
Vbias Ibias Vin Iin Vout Iout Pin Pbias Pout Ploss Overall Efficiency Power Stage Efficiency
10.93 0.21 48.02 0.059 12.002 0.00 2.83 2.27 0.00 2.83 0.00% 0.00%
10.93 0.21 48.02 0.312 12 1.01 14.98 2.27 12.12 2.86 70.24% 80.90%
10.93 0.21 48.02 0.561 11.99 2.01 26.94 2.30 24.10 2.84 82.44% 89.46%
10.93 0.21 48.02 0.809 11.98 3.01 38.85 2.31 36.06 2.79 87.62% 92.82%
10.93 0.21 48.01 1.064 11.98 4.04 51.08 2.32 48.40 2.68 90.64% 94.75%
10.93 0.21 48.01 1.311 11.97 5.03 62.94 2.34 60.21 2.73 92.23% 95.66%
10.93 0.22 48.01 1.56 11.97 6.02 74.90 2.35 72.06 2.84 93.29% 96.21%
10.93 0.22 48.01 1.809 11.96 7.02 86.85 2.37 83.94 2.91 94.07% 96.64%
10.93 0.22 48.01 2.056 11.95 8.02 98.71 2.38 95.79 2.92 94.76% 97.04%
10.93 0.22 48.01 2.304 11.95 9.01 110.62 2.39 107.71 2.91 95.31% 97.37%
10.93 0.22 48.01 2.559 11.94 10.04 122.86 2.42 119.88 2.98 95.69% 97.57%
10.93 0.23 48 3.798 11.92 15.03 182.30 2.48 179.16 3.15 96.95% 98.27%
10.92 0.23 47.99 5.044 11.89 20.05 242.06 2.53 238.39 3.67 97.46% 98.49%
10.92 0.24 47.99 6.289 11.86 25.07 301.81 2.59 297.29 4.51 97.67% 98.50%
10.92 0.24 47.98 7.535 11.84 30.09 361.53 2.62 356.27 5.26 97.83% 98.54%
10.92 0.24 47.97 8.78 11.81 35.11 421.18 2.65 414.64 6.54 97.83% 98.45%
10.92 0.25 47.96 10.017 11.78 40.10 480.42 2.68 472.38 8.04 97.78% 98.33%
10.92 0.25 47.95 11.261 11.75 45.12 539.96 2.68 530.17 9.79 97.70% 98.19%
10.92 0.25 47.95 12.505 11.72 50.14 599.61 2.70 587.61 12.01 97.56% 98.00%
10.92 0.25 47.94 13.75 11.69 55.16 659.18 2.71 644.80 14.38 97.42% 97.82%
10.92 0.25 47.93 14.994 11.66 60.18 718.66 2.70 701.66 17.00 97.27% 97.63%
10.92 0.25 47.92 16.239 11.63 65.19 778.17 2.70 758.19 19.98 97.10% 97.43%
10.92 0.25 47.91 17.474 11.6 70.18 837.18 2.68 814.13 23.04 96.94% 97.25%
10.92 0.24 47.9 18.717 11.57 75.20 896.54 2.64 870.10 26.45 96.77% 97.05%
10.93 0.24 47.89 19.96 11.52 80.22 955.88 2.60 924.13 31.75 96.42% 96.68%
Table 3-3 Efficiency at 52Vin, Conversion Ratio = 4:1
Vbias Ibias Vin Iin Vout Iout Pin Pbias Pout Ploss Overall Efficiency Power Stage Efficiency
10.83 0.21 52.00 0.0633 12.999 0.000 3.29 2.27 0.00 3.29 0.00% 0.00%
10.83 0.21 52.00 0.3153 12.991 1.009 16.40 2.27 13.11 3.28 70.23% 79.97%
10.83 0.21 51.99 0.564 12.983 2.009 29.32 2.27 26.09 3.24 82.56% 88.97%
10.83 0.22 51.99 0.8126 12.975 3.009 42.25 2.38 39.05 3.20 87.49% 92.42%
10.83 0.22 51.99 1.0681 12.968 4.034 55.53 2.38 52.32 3.21 90.34% 94.21%
10.83 0.22 51.99 1.3166 12.96 5.023 68.45 2.38 65.10 3.35 91.91% 95.11%
10.83 0.22 51.99 1.5651 12.953 6.016 81.37 2.38 77.92 3.45 93.04% 95.76%
10.83 0.22 51.99 1.8138 12.946 7.016 94.30 2.38 90.82 3.48 93.94% 96.31%
10.83 0.22 51.99 2.062 12.939 8.013 107.20 2.38 103.67 3.53 94.61% 96.71%
10.83 0.22 51.99 2.3101 12.933 9.009 120.10 2.38 116.52 3.58 95.13% 97.02%
10.83 0.22 51.99 2.5651 12.926 10.037 133.36 2.38 129.74 3.62 95.58% 97.28%
10.82 0.23 52.00 3.804 12.9 15.028 197.81 2.49 193.86 3.95 96.79% 98.00%
10.81 0.24 52.00 5.05 12.873 20.046 262.60 2.59 258.05 4.55 97.31% 98.27%
10.81 0.24 52.00 6.295 12.845 25.062 327.34 2.59 321.92 5.42 97.57% 98.34%
10.80 0.25 52.00 7.5403 12.818 30.087 392.10 2.70 385.66 6.44 97.69% 98.36%
10.80 0.25 52.00 8.7846 12.791 35.106 456.80 2.70 449.04 7.76 97.72% 98.30%
10.80 0.25 52.00 10.021 12.764 40.096 521.09 2.70 511.79 9.31 97.71% 98.21%
10.80 0.25 52.00 11.265 12.735 45.117 585.78 2.70 574.56 11.22 97.64% 98.09%
10.80 0.25 52.00 12.509 12.709 50.134 650.47 2.70 637.15 13.31 97.55% 97.95%
10.80 0.25 52.00 13.752 12.677 55.153 715.10 2.70 699.17 15.93 97.40% 97.77%
10.79 0.26 52.00 14.994 12.647 60.171 779.69 2.81 760.98 18.71 97.25% 97.60%
10.79 0.26 52.00 16.237 12.607 65.187 844.32 2.81 821.81 22.51 97.01% 97.33%
10.79 0.26 52.00 17.474 12.572 70.178 908.65 2.81 882.28 26.37 96.80% 97.10%
10.81 0.24 52.00 18.716 12.556 75.198 973.23 2.59 944.19 29.05 96.76% 97.02%
10.84 0.21 52.00 19.949 12.405 80.218 1037.35 2.28 995.10 42.24 95.72% 95.93%
Table 3-4 Efficiency at 36Vin, Conversion Ratio = 3:1
Vbias Ibias Vin Iin Vout Iout Pin Pbias Pout Ploss Overall Efficiency Power Stage Efficiency
10.79 0.16 36.00 0.05 11.999 0.000 1.80 1.73 0.00 1.80 0.00% 0.00%
10.79 0.16 35.99 0.3858 11.991 1.009 13.88 1.73 12.10 1.78 77.52% 87.16%
10.79 0.16 35.99 0.7173 11.982 2.006 25.82 1.73 24.04 1.78 87.28% 93.12%
10.79 0.17 35.99 1.0483 11.974 3.006 37.73 1.83 36.00 1.73 90.99% 95.41%
10.79 0.17 35.99 1.389 11.966 4.034 49.99 1.83 48.27 1.72 93.15% 96.57%
10.79 0.17 35.99 1.7196 11.958 5.025 61.89 1.83 60.09 1.80 94.30% 97.09%
10.79 0.17 35.99 2.0511 11.951 6.019 73.82 1.83 71.93 1.89 95.08% 97.44%
10.79 0.17 35.99 2.3813 11.943 7.016 85.70 1.83 83.79 1.92 95.72% 97.76%
10.79 0.17 36.00 2.7113 11.942 8.013 97.61 1.83 95.69 1.92 96.22% 98.03%
10.79 0.17 36.00 3.0422 11.934 9.009 109.52 1.83 107.52 2.00 96.56% 98.17%
10.79 0.17 36.00 3.3818 11.926 10.037 121.74 1.83 119.70 2.04 96.86% 98.32%
10.78 0.18 36.00 5.0325 11.893 15.025 181.17 1.94 178.69 2.48 97.59% 98.63%
10.78 0.18 36.00 6.6928 11.856 20.046 240.94 1.94 237.67 3.28 97.85% 98.64%
10.77 0.19 36.00 8.3524 11.823 25.062 300.69 2.05 296.31 4.38 97.88% 98.54%
10.77 0.19 36.00 10.012 11.789 30.086 360.43 2.05 354.68 5.75 97.85% 98.41%
10.77 0.19 36.00 11.671 11.755 35.106 420.16 2.05 412.67 7.48 97.74% 98.22%
10.77 0.19 36.00 13.318 11.721 40.096 479.45 2.05 469.97 9.48 97.61% 98.02%
10.77 0.19 36.00 14.977 11.683 45.114 539.17 2.05 527.07 12.11 97.39% 97.75%
10.78 0.20 36.00 16.636 11.640 50.134 598.90 2.16 583.56 15.34 97.09% 97.44%
10.78 0.20 36.00 18.294 11.602 55.153 658.58 2.16 639.89 18.70 96.84% 97.16%
10.78 0.20 36.00 19.951 11.561 60.167 718.24 2.16 695.59 22.65 96.56% 96.85%
10.78 0.20 36.00 21.609 11.513 65.187 777.92 2.16 750.50 27.43 96.21% 96.47%
Table 3-5 Efficiency at 48Vin, Conversion Ratio = 3:1
Vbias Ibias Vin Iin Vout Iout Pin Pbias Pout Ploss Overall Efficiency Power Stage Efficiency
10.95 0.16 48.02 0.067 16 0.00 3.22 1.77 0.00 3.22 0.00% 0.00%
10.95 0.16 48.02 0.403 16 1.02 19.35 1.78 16.27 3.08 76.98% 84.08%
10.95 0.16 48.02 0.734 15.99 2.02 35.25 1.80 32.24 3.01 87.02% 91.46%
10.95 0.17 48.02 1.066 15.98 3.01 51.19 1.81 48.15 3.04 90.85% 94.06%
10.95 0.17 48.01 1.405 15.97 4.04 67.45 1.82 64.49 2.97 93.09% 95.60%
10.95 0.17 48.01 1.736 15.96 5.03 83.35 1.83 80.31 3.03 94.29% 96.36%
10.94 0.17 48.01 2.068 15.95 6.02 99.28 1.84 96.05 3.23 94.98% 96.74%
10.95 0.17 48.01 2.398 15.95 7.02 115.13 1.85 111.95 3.17 95.70% 97.24%
10.95 0.17 48.01 2.728 15.94 8.02 130.97 1.86 127.79 3.18 96.20% 97.57%
10.95 0.17 48.00 3.059 15.93 9.02 146.83 1.87 143.62 3.21 96.58% 97.82%
10.95 0.17 48.00 3.400 15.92 10.04 163.20 1.88 159.84 3.36 96.82% 97.94%
10.94 0.18 47.99 5.050 15.89 15.03 242.35 1.94 238.83 3.52 97.77% 98.55%
10.94 0.18 47.98 6.712 15.85 20.05 322.04 1.98 317.79 4.25 98.08% 98.68%
10.94 0.18 47.97 8.372 15.81 25.07 401.60 2.01 396.36 5.25 98.20% 98.69%
10.94 0.19 47.96 10.033 15.77 30.09 481.18 2.05 474.52 6.66 98.20% 98.62%
10.94 0.19 47.95 11.692 15.73 35.11 560.63 2.06 552.31 8.32 98.16% 98.52%
10.94 0.19 47.94 13.343 15.69 40.10 639.66 2.08 629.17 10.49 98.04% 98.36%
10.94 0.19 47.93 15.000 15.65 45.12 718.95 2.08 706.13 12.82 97.93% 98.22%
10.94 0.19 47.92 16.661 15.61 50.14 798.40 2.05 782.69 15.71 97.78% 98.03%
10.95 0.19 47.9 18.320 15.55 55.16 877.53 2.06 857.72 19.81 97.51% 97.74%
10.95 0.19 47.88 19.980 15.51 60.18 956.64 2.07 933.35 23.30 97.35% 97.56%
10.95 0.19 47.87 21.637 15.46 65.19 1035.76 2.06 1007.88 27.88 97.12% 97.31%
Table 3-6 Efficiency at 52Vin, Conversion Ratio = 3:1
Vbias Ibias Vin Iin Vout Iout Pin Pbias Pout Ploss Overall Efficiency Power Stage Efficiency
10.84 0.17 52.00 0.0773 17.334 0.000 4.02 1.84 0.00 4.02 0.00% 0.00%
10.84 0.17 52.00 0.4141 17.323 1.016 21.53 1.84 17.59 3.94 75.26% 81.70%
10.84 0.17 51.99 0.7456 17.313 2.013 38.76 1.84 34.84 3.92 85.81% 89.88%
10.84 0.17 51.99 1.0774 17.303 3.009 56.01 1.84 52.07 3.94 90.00% 92.96%
10.84 0.17 51.99 1.4178 17.293 4.034 73.71 1.84 69.77 3.95 92.34% 94.65%
10.84 0.17 51.99 1.7494 17.283 5.029 90.95 1.84 86.92 4.03 93.67% 95.57%
10.84 0.17 51.99 2.0808 17.273 6.022 108.18 1.84 104.01 4.17 94.54% 96.15%
10.84 0.17 51.99 2.4113 17.263 7.019 125.36 1.84 121.16 4.20 95.25% 96.65%
10.82 0.18 52.00 2.7419 17.260 8.016 142.58 1.95 138.35 4.23 95.73% 97.03%
10.82 0.18 52.00 3.0726 17.251 9.013 159.78 1.95 155.47 4.30 96.14% 97.31%
10.82 0.18 52.00 3.4129 17.240 10.040 177.47 1.95 173.09 4.38 96.47% 97.53%
10.82 0.18 52.00 5.0651 17.201 15.030 263.39 1.95 258.53 4.85 97.44% 98.16%
10.82 0.18 52.00 6.7269 17.159 20.050 349.80 1.95 344.04 5.76 97.81% 98.35%
10.79 0.19 52.00 8.3868 17.119 25.067 436.11 2.05 429.12 6.99 97.94% 98.40%
10.79 0.19 52.00 10.048 17.083 30.089 522.50 2.05 514.01 8.49 97.99% 98.38%
10.79 0.19 52.00 11.708 17.044 35.109 608.82 2.05 598.40 10.42 97.96% 98.29%
10.79 0.20 52.00 13.356 17.005 40.100 694.51 2.16 681.90 12.61 97.88% 98.18%
10.79 0.20 52.00 15.015 16.960 45.118 780.78 2.16 765.20 15.58 97.73% 98.00%
10.79 0.20 52.00 16.675 16.918 50.137 867.10 2.16 848.22 18.88 97.58% 97.82%
10.79 0.20 52.00 18.332 16.906 55.156 953.26 2.16 932.47 20.80 97.60% 97.82%
10.70 0.21 52.00 19.988 16.872 60.171 1039.38 2.25 1015.21 24.17 97.46% 97.67%
10.70 0.21 52.00 21.647 16.830 65.189 1125.64 2.25 1097.13 28.51 97.27% 97.47%