* APWM 
* Controller by Anders Mikkelsen
* Self-oscillating ZCS (Zero Current Switching) controller with phase-lead compensation
*
* CUSTOMIZABLE PARAMETERS:
*   pvolts  - Primary voltage (default: 330V)
*           Adjust to match your bus voltage
*
*   rlead   - Phase lead resistor (default: 1k)
*           Higher = less phase lead
*
*   rfreq   - Frequency compensation resistor (default: 2k)
*           Affects self-oscillation frequency
*
*   iscale  - Current sense scaling (default: 0.05)
*           Adjust based on CT ratio and sense resistor

.param pvolts=330
.param rlead=1k
.param rfreq=2k
.param iscale=0.05
.param rterm=50

V_5v p5v 0 5
R6 0 N012 1k
R7 N012 p5v 1k
Rbias N001 N012 100k
XU1 N014 N001 p5v 0 N008 LT1720
R1 N008 N014 22k
R4 N011 N008 {rfreq}
R3 N011 N001 1k
C1 N001 0 1n
XU2 N003 N001 p5v 0 N002 LT1720
Vramp N003 0 PULSE(0v 5v 100us 100n 100n 500us)
A1 N002 N008 0 0 0 0 N009 0 AND
T1 N009 0 N007 N010 Td=50n Z0={rterm}
R10 N007 N010 {rterm}
R5 N013 N012 {rlead}
C3 N013 N015 470p
R2 N014 N013 4k7
R9 N013 N016 1k
C4 N016 N015 10n
B2 N015 0 V=I(L1)*{iscale}
B1 vin 0 V=if(V(N009)>0.5, {pvolts/2}, -{pvolts/2})

.tran 0 600u 100u 10n startup
.lib LT1720.sub