(kicad_sch (version 20211123) (generator eeschema)
  (paper "A4")
  (lib_symbols
    (symbol "Connector:Conn_01x03_Female" (pin_names (offset 1.016) hide) (in_bom yes) (on_board yes)
      (property "Reference" "J" (id 0) (at 0 5.08 0))
      (property "Value" "Conn_01x03_Female" (id 1) (at 0 -5.08 0))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "~" (id 3) (at 0 0 0))
      (property "ki_keywords" "connector" (id 4) (at 0 0 0))
      (property "ki_description" "Generic connector, single row, 01x03, script generated (kicad-library-utils/schlib/autogen/connector/)" (id 5) (at 0 0 0))
      (property "ki_fp_filters" "Connector*:*_1x??_*" (id 6) (at 0 0 0))
      (symbol "Conn_01x03_Female_1_1"
        (arc (start 0 -2.032) (mid -0.508 -2.54) (end 0 -3.048)
          (fill (type none))
        )
        (polyline
          (pts
            (xy -1.27 -2.54)
            (xy -0.508 -2.54)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy -1.27 0)
            (xy -0.508 0)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy -1.27 2.54)
            (xy -0.508 2.54)
          )
          (fill (type none))
        )
        (arc (start 0 0.508) (mid -0.508 0) (end 0 -0.508)
          (fill (type none))
        )
        (arc (start 0 3.048) (mid -0.508 2.54) (end 0 2.032)
          (fill (type none))
        )
        (pin passive line (at -5.08 2.54 0) (length 3.81)
          (name "Pin_1")
          (number "1")
        )
        (pin passive line (at -5.08 0 0) (length 3.81)
          (name "Pin_2")
          (number "2")
        )
        (pin passive line (at -5.08 -2.54 0) (length 3.81)
          (name "Pin_3")
          (number "3")
        )
      )
    )
    (symbol "Simulation_SPICE:VDC" (pin_numbers hide) (pin_names (offset 0.0254)) (in_bom yes) (on_board yes)
      (property "Reference" "V" (id 0) (at 2.54 2.54 0))
      (property "Value" "VDC" (id 1) (at 2.54 0 0))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "~" (id 3) (at 0 0 0))
      (property "Spice_Netlist_Enabled" "Y" (id 4) (at 0 0 0))
      (property "Spice_Primitive" "V" (id 5) (at 0 0 0))
      (property "Spice_Model" "dc(1)" (id 6) (at 2.54 -2.54 0))
      (property "ki_keywords" "simulation" (id 7) (at 0 0 0))
      (property "ki_description" "Voltage source, DC" (id 8) (at 0 0 0))
      (symbol "VDC_0_0"
        (polyline
          (pts
            (xy -1.27 0.254)
            (xy 1.27 0.254)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy -0.762 -0.254)
            (xy -1.27 -0.254)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0.254 -0.254)
            (xy -0.254 -0.254)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 1.27 -0.254)
            (xy 0.762 -0.254)
          )
          (fill (type none))
        )
        (text "+" (at 0 1.905 0))
      )
      (symbol "VDC_0_1"
        (circle (center 0 0) (radius 2.54)
          (fill (type background))
        )
      )
      (symbol "VDC_1_1"
        (pin passive line (at 0 5.08 270) (length 2.54)
          (name "~")
          (number "1")
        )
        (pin passive line (at 0 -5.08 90) (length 2.54)
          (name "~")
          (number "2")
        )
      )
    )
    (symbol "Spice_power_electronics:UC3525" (in_bom yes) (on_board yes)
      (property "Reference" "U" (id 0) (at 6.35 19.05 0))
      (property "Value" "UC3525" (id 1) (at 11.43 16.51 0))
      (property "Footprint" "Package_DIP:DIP-16_W7.62mm" (id 2) (at 0 0 0))
      (property "Datasheet" "https://www.ti.com/lit/ds/symlink/uc3525a.pdf" (id 3) (at 38.1 6.35 0))
      (property "Spice_Primitive" "X" (id 4) (at 3.81 21.59 0))
      (property "Spice_Model" "SG3525" (id 5) (at 11.43 19.05 0))
      (property "Spice_Netlist_Enabled" "Y" (id 6) (at 3.81 19.05 0))
      (property "Spice_Lib_File" "$(KICAD_SIMULATION_LIB_DIR)/ngspice-lib/pwm_generator/IC_3525.lib" (id 7) (at 15.24 10.16 0))
      (property "ki_keywords" "SMPS PWM Controller" (id 8) (at 0 0 0))
      (property "ki_description" "Regulating Pulse Width Modulators, NOR Logic, PDIP-16/SOIC-16" (id 9) (at 0 0 0))
      (property "ki_fp_filters" "SOIC*16*7.5x10.3mm*P1.27mm* DIP*16*W7.62mm*" (id 10) (at 0 0 0))
      (symbol "UC3525_0_1"
        (rectangle (start -10.16 -15.24) (end 10.16 15.24)
          (fill (type background))
        )
      )
      (symbol "UC3525_1_1"
        (pin input line (at -12.7 10.16 0) (length 2.54)
          (name "INV")
          (number "1")
        )
        (pin passive line (at -12.7 2.54 0) (length 2.54)
          (name "SD")
          (number "10")
        )
        (pin output line (at 12.7 2.54 180) (length 2.54)
          (name "OUTA")
          (number "11")
        )
        (pin power_in line (at 0 -17.78 90) (length 2.54)
          (name "GND")
          (number "12")
        )
        (pin power_in line (at 2.54 17.78 270) (length 2.54)
          (name "VC")
          (number "13")
        )
        (pin output line (at 12.7 -2.54 180) (length 2.54)
          (name "OUTB")
          (number "14")
        )
        (pin power_in line (at 0 17.78 270) (length 2.54)
          (name "VIN")
          (number "15")
        )
        (pin power_in line (at -12.7 5.08 0) (length 2.54)
          (name "REF")
          (number "16")
        )
        (pin input line (at -12.7 12.7 0) (length 2.54)
          (name "NI")
          (number "2")
        )
        (pin passive line (at -12.7 0 0) (length 2.54)
          (name "SYNC")
          (number "3")
        )
        (pin output line (at -12.7 -2.54 0) (length 2.54)
          (name "OSC")
          (number "4")
        )
        (pin passive line (at -12.7 -7.62 0) (length 2.54)
          (name "CT")
          (number "5")
        )
        (pin passive line (at -12.7 -5.08 0) (length 2.54)
          (name "RT")
          (number "6")
        )
        (pin open_collector line (at -12.7 -10.16 0) (length 2.54)
          (name "DISCH")
          (number "7")
        )
        (pin passive line (at -12.7 -12.7 0) (length 2.54)
          (name "SS")
          (number "8")
        )
        (pin passive line (at -12.7 7.62 0) (length 2.54)
          (name "COMP")
          (number "9")
        )
      )
    )
    (symbol "power:+15V" (power) (pin_names (offset 0)) (in_bom yes) (on_board yes)
      (property "Reference" "#PWR" (id 0) (at 0 -3.81 0))
      (property "Value" "+15V" (id 1) (at 0 3.556 0))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "" (id 3) (at 0 0 0))
      (property "ki_keywords" "power-flag" (id 4) (at 0 0 0))
      (property "ki_description" "Power symbol creates a global label with name \"+15V\"" (id 5) (at 0 0 0))
      (symbol "+15V_0_1"
        (polyline
          (pts
            (xy -0.762 1.27)
            (xy 0 2.54)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0 0)
            (xy 0 2.54)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy 0 2.54)
            (xy 0.762 1.27)
          )
          (fill (type none))
        )
      )
      (symbol "+15V_1_1"
        (pin power_in line (at 0 0 90) (length 0) hide
          (name "+15V")
          (number "1")
        )
      )
    )
    (symbol "power:-15V" (power) (pin_names (offset 0)) (in_bom yes) (on_board yes)
      (property "Reference" "#PWR" (id 0) (at 0 2.54 0))
      (property "Value" "-15V" (id 1) (at 0 3.81 0))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "" (id 3) (at 0 0 0))
      (property "ki_keywords" "power-flag" (id 4) (at 0 0 0))
      (property "ki_description" "Power symbol creates a global label with name \"-15V\"" (id 5) (at 0 0 0))
      (symbol "-15V_0_0"
        (pin power_in line (at 0 0 90) (length 0) hide
          (name "-15V")
          (number "1")
        )
      )
      (symbol "-15V_0_1"
        (polyline
          (pts
            (xy 0 0)
            (xy 0 1.27)
            (xy 0.762 1.27)
            (xy 0 2.54)
            (xy -0.762 1.27)
            (xy 0 1.27)
          )
          (fill (type outline))
        )
      )
    )
    (symbol "power:GND" (power) (pin_names (offset 0)) (in_bom yes) (on_board yes)
      (property "Reference" "#PWR" (id 0) (at 0 -6.35 0))
      (property "Value" "GND" (id 1) (at 0 -3.81 0))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "" (id 3) (at 0 0 0))
      (property "ki_keywords" "power-flag" (id 4) (at 0 0 0))
      (property "ki_description" "Power symbol creates a global label with name \"GND\" , ground" (id 5) (at 0 0 0))
      (symbol "GND_0_1"
        (polyline
          (pts
            (xy 0 0)
            (xy 0 -1.27)
            (xy 1.27 -1.27)
            (xy 0 -2.54)
            (xy -1.27 -1.27)
            (xy 0 -1.27)
          )
          (fill (type none))
        )
      )
      (symbol "GND_1_1"
        (pin power_in line (at 0 0 270) (length 0) hide
          (name "GND")
          (number "1")
        )
      )
    )
    (symbol "pspice:CAP" (pin_names (offset 0.254)) (in_bom yes) (on_board yes)
      (property "Reference" "C" (id 0) (at 2.54 3.81 90))
      (property "Value" "CAP" (id 1) (at 2.54 -3.81 90))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "~" (id 3) (at 0 0 0))
      (property "ki_keywords" "simulation" (id 4) (at 0 0 0))
      (property "ki_description" "Capacitor symbol for simulation only" (id 5) (at 0 0 0))
      (symbol "CAP_0_1"
        (polyline
          (pts
            (xy -3.81 -1.27)
            (xy 3.81 -1.27)
          )
          (fill (type none))
        )
        (polyline
          (pts
            (xy -3.81 1.27)
            (xy 3.81 1.27)
          )
          (fill (type none))
        )
      )
      (symbol "CAP_1_1"
        (pin passive line (at 0 6.35 270) (length 5.08)
          (name "~")
          (number "1")
        )
        (pin passive line (at 0 -6.35 90) (length 5.08)
          (name "~")
          (number "2")
        )
      )
    )
    (symbol "pspice:R" (pin_numbers hide) (pin_names (offset 0)) (in_bom yes) (on_board yes)
      (property "Reference" "R" (id 0) (at 2.032 0 90))
      (property "Value" "R" (id 1) (at 0 0 90))
      (property "Footprint" "" (id 2) (at 0 0 0))
      (property "Datasheet" "~" (id 3) (at 0 0 0))
      (property "ki_keywords" "resistor simulation" (id 4) (at 0 0 0))
      (property "ki_description" "Resistor symbol for simulation only" (id 5) (at 0 0 0))
      (symbol "R_0_1"
        (rectangle (start -1.016 3.81) (end 1.016 -3.81)
          (fill (type none))
        )
      )
      (symbol "R_1_1"
        (pin passive line (at 0 6.35 270) (length 2.54)
          (name "~")
          (number "1")
        )
        (pin passive line (at 0 -6.35 90) (length 2.54)
          (name "~")
          (number "2")
        )
      )
    )
  )
  (junction (at 77.47 59.69) (diameter 0) (color 0 0 0 0))
  (junction (at 86.36 161.29) (diameter 0) (color 0 0 0 0))
  (junction (at 86.36 163.83) (diameter 0) (color 0 0 0 0))
  (junction (at 106.68 30.48) (diameter 0) (color 0 0 0 0))
  (junction (at 31.75 161.29) (diameter 0) (color 0 0 0 0))
  (junction (at 86.36 158.75) (diameter 0) (color 0 0 0 0))
  (junction (at 92.71 31.75) (diameter 0) (color 0 0 0 0))
  (no_connect (at 78.74 53.34))
  (no_connect (at 104.14 53.34))
  (no_connect (at 78.74 50.8))
  (wire (pts (xy 78.74 60.96) (xy 77.47 60.96)))
  (wire (pts (xy 93.98 31.75) (xy 92.71 31.75)))
  (wire (pts (xy 71.12 45.72) (xy 78.74 45.72)))
  (polyline (pts (xy 123.19 99.06) (xy 123.19 120.65)))
  (polyline (pts (xy 82.55 120.65) (xy 60.96 120.65)))
  (wire (pts (xy 77.47 43.18) (xy 77.47 40.64)))
  (polyline (pts (xy 74.93 176.53) (xy 106.68 176.53)))
  (polyline (pts (xy 123.19 120.65) (xy 91.44 120.65)))
  (wire (pts (xy 93.98 33.02) (xy 93.98 31.75)))
  (wire (pts (xy 74.93 158.75) (xy 86.36 158.75)))
  (wire (pts (xy 77.47 59.69) (xy 77.47 58.42)))
  (polyline (pts (xy 60.96 97.79) (xy 82.55 97.79)))
  (wire (pts (xy 86.36 161.29) (xy 104.14 161.29)))
  (polyline (pts (xy 82.55 97.79) (xy 82.55 120.65)))
  (wire (pts (xy 86.36 158.75) (xy 97.79 158.75)))
  (wire (pts (xy 91.44 31.75) (xy 92.71 31.75)))
  (wire (pts (xy 71.12 48.26) (xy 78.74 48.26)))
  (wire (pts (xy 91.44 72.39) (xy 91.44 68.58)))
  (wire (pts (xy 86.36 163.83) (xy 97.79 163.83)))
  (wire (pts (xy 77.47 58.42) (xy 78.74 58.42)))
  (wire (pts (xy 97.79 158.75) (xy 97.79 153.67)))
  (wire (pts (xy 76.2 63.5) (xy 78.74 63.5)))
  (wire (pts (xy 77.47 43.18) (xy 78.74 43.18)))
  (wire (pts (xy 118.11 48.26) (xy 104.14 48.26)))
  (wire (pts (xy 97.79 170.18) (xy 97.79 163.83)))
  (wire (pts (xy 71.12 100.33) (xy 71.12 101.6)))
  (wire (pts (xy 71.12 48.26) (xy 71.12 52.07)))
  (polyline (pts (xy 106.68 146.05) (xy 106.68 176.53)))
  (wire (pts (xy 109.22 101.6) (xy 109.22 104.14)))
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  (wire (pts (xy 74.93 165.1) (xy 74.93 163.83)))
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  (wire (pts (xy 76.2 59.69) (xy 77.47 59.69)))
  (wire (pts (xy 97.79 101.6) (xy 97.79 104.14)))
  (wire (pts (xy 104.14 162.56) (xy 104.14 161.29)))
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  (polyline (pts (xy 74.93 146.05) (xy 106.68 146.05)))
  (wire (pts (xy 43.18 165.1) (xy 74.93 165.1)))
  (wire (pts (xy 43.18 165.1) (xy 43.18 171.45)))
  (wire (pts (xy 77.47 60.96) (xy 77.47 59.69)))
  (wire (pts (xy 76.2 55.88) (xy 78.74 55.88)))
  (polyline (pts (xy 74.93 176.53) (xy 74.93 146.05)))
  (wire (pts (xy 74.93 157.48) (xy 74.93 158.75)))
  (polyline (pts (xy 60.96 120.65) (xy 60.96 97.79)))
  (polyline (pts (xy 91.44 99.06) (xy 91.44 120.65)))
  (wire (pts (xy 92.71 30.48) (xy 106.68 30.48)))
  (wire (pts (xy 92.71 30.48) (xy 92.71 31.75)))
  (wire (pts (xy 91.44 33.02) (xy 91.44 31.75)))
  (wire (pts (xy 41.91 38.1) (xy 78.74 38.1)))
  (wire (pts (xy 43.18 99.06) (xy 43.18 102.87)))
  (wire (pts (xy 77.47 40.64) (xy 78.74 40.64)))
  (wire (pts (xy 106.68 22.86) (xy 106.68 30.48)))
  (wire (pts (xy 43.18 171.45) (xy 31.75 171.45)))
  (wire (pts (xy 43.18 157.48) (xy 43.18 151.13)))
  (polyline (pts (xy 91.44 99.06) (xy 123.19 99.06)))
  (text "* Auxilary power supply input" (at 76.2 144.78 0))
  (text ".subckt OPAMP INon IInv out Vp Vm g=100k\n  bGain gain gnd v={g*v(INon, IInv)}\n  bOut out gnd v={v(gain)> v(Vp) ? v(Vp) : v(gain) < v(Vm) ? v(Vm) : v(gain)}\n.ends OPAMP\n\n\n.subckt SG3525 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16\n	* Voltage reference\n	.param Vref = 5.1V\n	bVref 16 12 v={Vref < v(15, 12) ? Vref : v(15) }\n\n	* Error amplifier (opamp)\n	xOpampError 2 1 9 15 12 OPAMP\n\n	* Measure Ct\n	aCtMeter 5 CtVal ctest\n	.model ctest cmeter(gain=1.0)\n\n	* Measure Rt\n	vRtMeasI 16 6 0\n	bRt 12 RtVal v={-Vref/i(vRtMeasI)}\n\n	* Triangular wave oscillator\n	* f = 1/(Ct*0.7*Rt)\n	bFreq freq 12 v={(1/(v(CtVal)*0.7*v(RtVal))) < 1 ? 1 : 1/(v(CtVal)*0.7*v(RtVal))}\n	aTriOsc freq carrier trigen\n	.model trigen triangle(cntl_array = [10 500e3]\n		+freq_array=[10 500e3] out_low = 0\n		+out_high = {Vref} duty_cycle = 0.999)\n\n	* Carrier debug (send it to OSC output)\n	Rtie carrier 4 0\n\n	* PWM\n	bOutA 11 12 v={min(v(9), v(8)) > v(carrier)+v(12) ? v(doShutdown,12) < {Vref/2} ? v(13) : v(12) : v(12) }\n	bOutB 14 12 v={min(v(9), v(8)) < v(carrier)+v(12) ? v(doShutdown,12) < {Vref/2} ? v(13) : v(12) : v(12) }\n\n	* Soft Start\n	.param IssVal = 50u\n	Iss 12 8 {IssVal}\n	a1 12 8 vclamp\n	.model vclamp zener(v_breakdown={Vref} i_breakdown={IssVal})\n	*.model vclamp sidiode(Vrev={Vref})\n\n	* Shutdown\n	bShutdown doShutdown 12 v={v(10,12) > 0.8 ? {Vref} : v(12) }; Threshold on pin 10 is around 0.8V\n	sShutdownSwitch 8 12 doShutdown 12 sswitch ON\n	.model sswitch SW(RON=3k VT={Vref/2})\n\n.ends SG3525\n\n"
    (at 167.64 123.19 0)
  )
  (text ".tran 10us 20ms uic\n.option INTERP" (at 184.15 175.26 0))
  (text "* RC oscillator for PWM carrier\n* f = 1/(0.7*Rt*Ct)"
    (at 91.44 97.79 0)
  )
  (text "* Soft Start ramp\n* Tstart = Css*5.1/50µA" (at 60.96 96.52 0))
  (label "pwm_to_driver" (at 118.11 48.26 0))
  (label "rt" (at 76.2 55.88 180))
  (label "ct" (at 76.2 59.69 180))
  (label "ct" (at 109.22 101.6 0))
  (label "vref" (at 71.12 45.72 180))
  (label "opamp_buff_fb" (at 77.47 41.91 180))
  (label "rt" (at 97.79 101.6 0))
  (label "soft_start" (at 71.12 100.33 0))
  (label "vref" (at 43.18 99.06 0))
  (label "soft_start" (at 76.2 63.5 180))
  (symbol (lib_id "power:GND") (at 71.12 114.3 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (property "Reference" "#PWR03" (id 0) (at 71.12 120.65 0))
    (property "Value" "GND" (id 1) (at 71.12 119.38 0))
    (property "Footprint" "" (id 2) (at 71.12 114.3 0))
    (property "Datasheet" "" (id 3) (at 71.12 114.3 0))
    (pin "1")
  )
  (symbol (lib_id "pspice:CAP") (at 43.18 109.22 0) (mirror y) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (property "Reference" "C1" (id 0) (at 48.26 107.9499 0))
    (property "Value" "100nF" (id 1) (at 48.26 110.4899 0))
    (property "Footprint" "Capacitor_THT:C_Disc_D7.0mm_W2.5mm_P5.00mm" (id 2) (at 43.18 109.22 0))
    (property "Datasheet" "~" (id 3) (at 43.18 109.22 0))
    (pin "1")
    (pin "2")
  )
  (symbol (lib_id "pspice:CAP") (at 106.68 36.83 0) (unit 1)
    (in_bom yes) (on_board yes) (fields_autoplaced)
    (property "Reference" "C3" (id 0) (at 111.76 35.5599 0))
    (property "Value" "100nF" (id 1) (at 111.76 38.0999 0))
    (property "Footprint" "Capacitor_THT:C_Disc_D7.0mm_W2.5mm_P5.00mm" (id 2) (at 106.68 36.83 0))
    (property "Datasheet" "~" (id 3) (at 106.68 36.83 0))
    (pin "1")
    (pin "2")
  )
  (symbol (lib_id "Simulation_SPICE:VDC") (at 31.75 156.21 0) (unit 1)
    (in_bom no) (on_board no) (fields_autoplaced)
    (property "Reference" "V1" (id 0) (at 35.56 153.4801 0))
    (property "Value" "VDC" (id 1) (at 35.56 156.0201 0))
    (property "Footprint" "" (id 2) (at 31.75 156.21 0))
    (property "Datasheet" "~" (id 3) (at 31.75 156.21 0))
    (property "Spice_Netlist_Enabled" "Y" (id 4) (at 31.75 156.21 0))
    (property "Spice_Primitive" "V" (id 5) (at 31.75 156.21 0))
    (property "Spice_Model" "dc 15" (id 6) (at 35.56 158.5601 0))
    (pin "1")
    (pin "2")
  )
  (symbol (lib_id "Connector:Conn_01x03_Female") (at 91.44 161.29 0) (unit 1)
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