12 V to 5 V / 1 A Buck Molecule (TPS54202), built in Altium Designer - design/calcs.json

Overview Files Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

main

Colby Knox Altium Designer build of the TPS54202 buck molecule: Altium project, manufacturing set, STEP and GLB, design, simulatio… 845dd0d 4d ago

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

{
 "feedback": {
  "Rtop_parts_ohm": [
   5600.0,
   68000.0
  ],
  "Rbot_parts_ohm": [
   10000.0
  ],
  "Rtop": 73600.0,
  "Rbot": 10000.0,
  "vout_nominal": 4.9826,
  "error_pct": -0.35,
  "vout_range_vref_tol": [
   4.857,
   5.108
  ]
 },
 "inductor": {
  "Lmin_uH": 22.92,
  "L_uH": 15,
  "ripple_A_at_12V": 0.389,
  "ripple_A_at_16V": 0.458,
  "Ipeak_A_at_16V": 1.229,
  "Irms_A": 1.009,
  "Isat_required_A": 2.5,
  "note": "Isat 3.7 A / Irms 3.5 A (AMPLH5030S-150M datasheet p2) >= the 2.5 A HS current-limit minimum, DCR 98 typ / 118 max mOhm. 15 uH chosen over Lmin 22.9 uH (KIND 0.3 at 16 V): it is the 5 V value in TI Table 7-2, which the internal slope compensation is tuned for; ripple 0.39 A (39 pct) at 12 V and 0.46 A (46 pct) at 16 V, peak 1.23 A, within 20-50 pct for low-ESR ceramic outputs"
 },
 "cout": {
  "C_step_min_uF": 26.7,
  "C_ripple_min_uF": 11.5,
  "chosen": "3 x 22 uF 0805 X5R 10 V (Adom stock)",
  "effective_uF": 36.3,
  "fo_kHz_eq14": 21.8,
  "fo_limit_kHz": 40,
  "ripple_mV_at_16V": 3.16,
  "Icout_rms_each_mA": 44.1
 },
 "cff": {
  "calc_pF": 99.4,
  "chosen_pF": 68,
  "note": "C0G 0402 stock; verified by the loop-gain sim"
 },
 "cin": {
  "Irms_A": 0.493,
  "chosen": "2 x 10 uF 1206 X7R 25 V (Mouser) + 100 nF 0603 X7R 50 V (Adom stock) at the VIN pin",
  "effective_uF": 12.0,
  "vin_ripple_mV": 40.5,
  "bulk": "47 uF 35 V aluminium electrolytic: damps the supply cable inductance against the low-ESR ceramics (hot-plug ringing), datasheet 7.3"
 },
 "uvlo": {
  "R_top": 1000000.0,
  "R_bot": 150000.0,
  "start_V": 8.58,
  "stop_V": 6.87,
  "hysteresis_V": 1.7,
  "EN_at_16V": 2.09,
  "EN_abs_max": 5.5,
  "EN_at_28V": 3.65
 },
 "thermal": {
  "P_ic_W": 0.253,
  "P_inductor_W": 0.12,
  "efficiency_est": 0.931,
  "Tj_rise_C_RthJA_118.6": 30.0,
  "Tj_rise_C_RthJA_EVM_57.2": 14.5,
  "note": "I^2R at hot Rds(on) over the duty + switching estimate; SOT-23 has no pad, heat leaves through the pins: GND/VIN copper is the heatsink"
 },
 "led": {
  "R_ohm": 2200.0,
  "I_mA": 1.36,
  "note": "power-good indicator on VOUT; 0603 green (Adom stock)"
 }
}