68 lines
1.8 KiB
Plaintext
68 lines
1.8 KiB
Plaintext
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KiCad schematic
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.save all
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.probe alli
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.tran 10us 20ms uic
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.option INTERP
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.subckt OPAMP INon IInv out Vp Vm g=100k
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bGain gain gnd v={g*v(INon, IInv)}
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bOut out gnd v={v(gain)> v(Vp) ? v(Vp) : v(gain) < v(Vm) ? v(Vm) : v(gain)}
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.ends OPAMP
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.subckt SG3525 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
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* Voltage reference
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.param Vref = 5.1V
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bVref 16 12 v={Vref < v(15, 12) ? Vref : v(15) }
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* Error amplifier (opamp)
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xOpampError 2 1 9 15 12 OPAMP
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* Measure Ct
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aCtMeter 5 CtVal ctest
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.model ctest cmeter(gain=1.0)
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* Measure Rt
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vRtMeasI 16 6 0
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bRt 12 RtVal v={-Vref/i(vRtMeasI)}
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* Triangular wave oscillator
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* f = 1/(Ct*0.7*Rt)
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bFreq freq 12 v={(1/(v(CtVal)*0.7*v(RtVal))) < 1 ? 1 : 1/(v(CtVal)*0.7*v(RtVal))}
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aTriOsc freq carrier trigen
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.model trigen triangle(cntl_array = [10 500e3]
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+freq_array=[10 500e3] out_low = 0
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+out_high = {Vref} duty_cycle = 0.999)
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* Carrier debug (send it to OSC output)
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Rtie carrier 4 0
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* PWM
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bOutA 11 12 v={min(v(9), v(8)) > v(carrier)+v(12) ? v(doShutdown,12) < {Vref/2} ? v(13) : v(12) : v(12) }
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bOutB 14 12 v={min(v(9), v(8)) < v(carrier)+v(12) ? v(doShutdown,12) < {Vref/2} ? v(13) : v(12) : v(12) }
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* Soft Start
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.param IssVal = 50u
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Iss 12 8 {IssVal}
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a1 12 8 vclamp
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.model vclamp zener(v_breakdown={Vref} i_breakdown={IssVal})
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*.model vclamp sidiode(Vrev={Vref})
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* Shutdown
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bShutdown doShutdown 12 v={v(10,12) > 0.8 ? {Vref} : v(12) }; Threshold on pin 10 is around 0.8V
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sShutdownSwitch 8 12 doShutdown 12 sswitch ON
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.model sswitch SW(RON=3k VT={Vref/2})
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.ends SG3525
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C4 /ct GND 150n
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R1 /rt GND 3.22k
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C3 +15V GND 100n
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XU1 /opamp_buff_fb Net-_U1-NI_ unconnected-_U1-SYNC-Pad3_ unconnected-_U1-OSC-Pad4_ /ct /rt /ct /soft_start /opamp_buff_fb GND /pwm_to_driver GND +15V unconnected-_U1-OUTB-Pad14_ +15V /vref SG3525
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C1 /vref GND 100n
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V3 Net-_U1-NI_ GND 4.5
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V1 +15V GND 15
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V2 GND -15V 15
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C2 /soft_start GND 100n
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.end
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