****************************************************************
* Phase Shift Resonant Controller UC3875
* Model created by Valentyn Volodin
* Created 18.03.2014
*
* Modified to Qspice by KSKelvin
* last update : 11-9-2025
****************************************************************  
.subckt UC3875 VREF EAOUT EA- EA+ CS+ SOFTSTART DELAYSET_CD OUTD OUTC VC VIN PGND OUTB OUTA DELAYSET_AB FREQSET CLOCKSYNC SLOPE RAMP 0
*A1 CLOCKSYNC N004 0 0 0 N005 N002 0 SRFLOP Vhigh=5 Ref=3.8 Trise=10n
VQ1 p5v 0 5
Ą1 p5v 0 N002 N005 CLOCKSYNC N004 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą SR-FLOP Ref=3.8 Trise=10n
*A2 FREQSET 0 0 0 0 0 N004 0 BUF Vlow=3.3 Vhigh=4.3 Ref=4.15 Trise=10n
VQ2 p4.3v 0 4.3
VQ3 p3.3v 0 3.3
Ą2 p4.3v p3.3v N004 Ą FREQSET Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Ref=0.85 Trise=10n
D1 N001 FREQSET Ideal
R1 N001 N002 75
D2 N008 CLOCKSYNC Real
R2 CLOCKSYNC 0 3.9k
*A3 FREQSET 0 0 0 0 N008 0 0 SCHMITT Vlow=4 Vhigh=5 Vt=3.7 Vh=0.4 Trise=10n
VQ4 p4v 0 4
Ą3 p5v p4v Ą N008 FREQSET 0 p5v Ą Ą Ą Ą Ą Ą Ą Ą Ą HMITT Vt=3.7 Vh=0.4 Trise=10n
D3 SLOPE N011 Real
V1 N011 0 0
F1 0 RAMP V1 1
D4 0 RAMP Z5
*A4 N006 0 N002 SHUTDOWN 0 N006 N007 0 DFLOP Vhigh=5 td=10n Trise=10n
Ą4 p5v 0 N007 N006 N006 N002 SHUTDOWN 0 Ą Ą Ą Ą Ą Ą Ą Ą D-FLOP td=10n Trise=10n
*A5 EAOUT N027 0 0 0 0 N022 0 SCHMITT Vhigh=5 Vt=0 Vh=1m Trise=10n
Ą5 p5v 0 N022 Ą EAOUT N027 p5v Ą Ą Ą Ą Ą Ą Ą Ą Ą HMITT Vt=0 Vh=1m Trise=10n
*A6 N032 EAOUT 0 0 0 0 N035 0 SCHMITT Vhigh=5 Vt=0 Vh=1m Trise=10n
Ą6 p5v 0 N035 Ą N032 EAOUT p5v Ą Ą Ą Ą Ą Ą Ą Ą Ą HMITT Vt=0 Vh=1m Trise=10n
V2 N027 RAMP 1.3
*A7 VIN 0 0 0 0 0 UVLO 0 SCHMITT Vhigh=5 Vt=10 Vh=0.75 Trise=50n
Ą7 p5v 0 UVLO Ą VIN 0 p5v Ą Ą Ą Ą Ą Ą Ą Ą Ą HMITT Vt=10 Vh=0.75 Trise=50n
R3 VIN 0 53k
G1 VIN 0 UVLO 0 6m
G2 VC 0 UVLO 0 3m
G3 0 N003 UVLO 0 10m
D6 0 N003 Z5
V3 N003 VREF 0
F2 VIN 0 V3 1
V4 N032 0 1
*A8 N022 0 0 0 N002 N029 0 0 OR Vhigh=5 Trise=10n
Ą8 p5v 0 Ą N029 N022 Ą Ą Ą N002 Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
*A9 N035 0 0 0 N005 N033 0 0 OR Vhigh=5 Trise=10n
Ą9 p5v 0 Ą N033 N035 Ą Ą Ą N005 Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
*A10 N029 N033 0 0 0 N034 0 0 SRFLOP Vhigh=5 Trise=10n
Ą10 p5v 0 Ą N034 N029 N033 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą SR-FLOP Trise=10n
*A11 N007 0 0 0 N034 N031 N030 0 XOR Vhigh=5 Trise=20n
Ą11 p5v 0 N030 N031 N007 Ą Ą Ą N034 Ą Ą Ą Ą Ą Ą Ą XOR Trise=20n
E1 N036 0 SOFTSTART 0 1
D7 EAOUT N036 IDEAL
R4 EAOUT N047 1k
C1 N046 0 1.59n ic=0
E2 N047 0 N046 0 1
*I1 N045 N046 15.9m load
I1 N045 N046 15.9m Vsat=0.5
*I2 N046 N045 15.9m load
I2 N046 N045 15.9m Vsat=0.5
E3 N044 0 EA+ EA- 10000
R5 N044 N045 100k
R6 EA- 0 5meg
R7 EA+ 0 5meg
C2 N045 0 0.1p ic=0
D8 0 N046 Z5
*A12 N056 0 0 0 N063 0 N062 0 OR Vhigh=5 Trise=10n
Ą12 p5v 0 N062 Ą N056 Ą Ą Ą N063 Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
*A13 N065 0 N066 0 N058 0 N064 0 AND Vhigh=5 Trise=10n
Ą13 p5v 0 N064 Ą N065 Ą N066 Ą N058 Ą Ą Ą Ą Ą Ą Ą AND Trise=10n
*A14 N064 N062 0 0 0 SHUTDOWN N061 0 SRFLOP Vhigh=5 Trise=10n
Ą14 p5v 0 N061 SHUTDOWN N064 N062 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą SR-FLOP Trise=10n
*A15 CS+ 0 0 0 0 N065 N063 0 BUF Vhigh=5 Ref=2.5 Trise=10n
Ą15 p5v 0 N063 N065 CS+ Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Ref=2.5 Trise=10n
*A16 SOFTSTART 0 0 0 0 N066 0 0 BUF Vhigh=5 Ref=0.2 Trise=10n
Ą16 p5v 0 Ą N066 SOFTSTART Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Ref=0.2 Trise=10n
*A17 SOFTSTART 0 0 0 0 0 N059 0 BUF Vhigh=5 Ref=4.3 Trise=10n
Ą17 p5v 0 N059 Ą SOFTSTART Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Ref=4.3 Trise=10n
*A18 N059 0 0 0 SHUTDOWN 0 N060 0 AND Vhigh=5 Trise=10n
Ą18 p5v 0 N060 Ą N059 Ą Ą Ą SHUTDOWN Ą Ą Ą Ą Ą Ą Ą AND Trise=10n
*A19 N056 0 0 0 N060 0 N057 0 OR Vhigh=5 Trise=10n
Ą19 p5v 0 N057 Ą N056 Ą Ą Ą N060 Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
D9 0 SOFTSTART Z5
I3 0 SOFTSTART 9u
G4 SOFTSTART 0 N058 0 46u
*A21 VREF 0 0 0 0 0 N055 0 BUF Vhigh=5 Ref=4.75 Trise=10n
Ą21 p5v 0 N055 Ą VREF Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Ref=4.75 Trise=10n
*A22 N055 0 UVLO 0 0 N056 0 0 AND Vhigh=5 Trise=10n
Ą22 p5v 0 Ą N056 N055 Ą UVLO Ą Ą Ą Ą Ą Ą Ą Ą Ą AND Trise=10n
V5 DELAYSET_AB 0 2.5 Rser=275
C3 N015 0 15p ic=0
D10 N013 N014 Ideal
*A23 N012 0 0 0 0 0 N013 0 BUF Vhigh=5 Trise=10n
Ą23 p5v 0 N013 Ą N012 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
R8 N014 N015 150
F3 N015 0 V5 -1
D11 0 N015 Ideal
*A24 N015 0 0 0 0 0 N016 0 BUF Vhigh=5 Ref=1 Trise=10n
Ą24 p5v 0 N016 Ą N015 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Ref=1 Trise=10n
*A25 N016 N012 SHUTDOWN 0 0 N010 N017 0 OR Vhigh=5 Trise=10n
Ą25 p5v 0 N017 N010 N016 N012 SHUTDOWN Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
C4 N025 0 15p ic=0
D12 N023 N024 Ideal
*A26 N019 0 0 0 0 0 N023 0 BUF Vhigh=5 Trise=10n
Ą26 p5v 0 N023 Ą N019 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
R9 N024 N025 150
F4 N025 0 V5 -1
D13 0 N025 Ideal
*A27 N025 0 0 0 0 0 N026 0 BUF Vhigh=5 Ref=1 Trise=10n
Ą27 p5v 0 N026 Ą N025 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Ref=1 Trise=10n
*A28 N026 N019 SHUTDOWN 0 0 N021 N028 0 OR Vhigh=5 Trise=10n
Ą28 p5v 0 N028 N021 N026 N019 SHUTDOWN Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
C5 N039 0 15p ic=0
D14 N037 N038 Ideal
*A29 N030 0 0 0 0 0 N037 0 BUF Vhigh=5 Trise=10n
Ą29 p5v 0 N037 Ą N030 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
R10 N038 N039 150
F5 N039 0 V6 -1
D15 0 N039 Ideal
*A30 N039 0 0 0 0 0 N040 0 BUF Vhigh=5 Ref=1 Trise=10n
Ą30 p5v 0 N040 Ą N039 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Ref=1 Trise=10n
*A31 N040 N030 SHUTDOWN 0 0 N043 N042 0 OR Vhigh=5 Trise=10n
Ą31 p5v 0 N042 N043 N040 N030 SHUTDOWN Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
C6 N050 0 15p ic=0
D16 N048 N049 Ideal
*A32 N031 0 0 0 0 0 N048 0 BUF Vhigh=5 Trise=10n
Ą32 p5v 0 N048 Ą N031 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
R11 N049 N050 150
F6 N050 0 V6 -1
D17 0 N050 Ideal
*A33 N050 0 0 0 0 0 N051 0 BUF Vhigh=5 Ref=1 Trise=10n
Ą33 p5v 0 N051 Ą N050 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Ref=1 Trise=10n
*A34 N051 N031 SHUTDOWN 0 0 N053 N052 0 OR Vhigh=5 Trise=10n
Ą34 p5v 0 N052 N053 N051 N031 SHUTDOWN Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Trise=10n
V6 DELAYSET_CD 0 2.5 Rser=275
*S1 OUTA N009 N010 0 HOUT
*S2 PGND P001 N017 0 LOUT
*S3 OUTB N020 N021 0 HOUT
*S4 PGND P002 N028 0 LOUT
XS1 OUTA N009 N010 0 HOUT
XS2 PGND P001 N017 0 LOUT
XS3 OUTB N020 N021 0 HOUT
XS4 PGND P002 N028 0 LOUT
D18 VC N009 IDEAL
D19 VC N020 IDEAL
D20 OUTA P001 IDEAL
D21 OUTB P002 IDEAL
*S5 OUTC N041 N043 0 HOUT
*S6 PGND P003 N042 0 LOUT
*S7 OUTD N054 N053 0 HOUT
*S8 PGND P004 N052 0 LOUT
XS5 OUTC N041 N043 0 HOUT
XS6 PGND P003 N042 0 LOUT
XS7 OUTD N054 N053 0 HOUT
XS8 PGND P004 N052 0 LOUT
D22 VC N041 IDEAL
D23 VC N054 IDEAL
D24 OUTC P003 IDEAL
D25 OUTD P004 IDEAL
*A35 N007 0 0 0 0 0 N012 0 BUF Vhigh=5 Trise=20n
Ą35 p5v 0 N012 Ą N007 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Trise=20n
*A36 N006 0 0 0 0 0 N019 0 BUF Vhigh=5 Trise=20n
Ą36 p5v 0 N019 Ą N006 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą OR Trise=20n
C7 SOFTSTART 0 0.1p ic=0
C8 FREQSET 0 0.1p ic=0
*A20 N061 N057 0 0 0 N058 0 0 SRFLOP Vhigh=5 Trise=10n
Ą20 p5v 0 Ą N058 N061 N057 Ą Ą Ą Ą Ą Ą Ą Ą Ą Ą SR-FLOP Trise=10n
D5 RAMP N018 Ideal
R12 N018 N005 150
C9 SOFTSTART 0 0.1p ic=0
R13 VC 0 800k
*.model Ideal D(Ron=0 Roff=1g Vfwd=0) ; modify Ron to Qspice
.model Ideal D(Ron=1m Roff=1g Vfwd=0)
.model Real D(Ron=10 Roff=1g Vfwd=0.7)
*.model Z5 D(Ron=0 Roff=1G Vfwd=0 Vrev=5) ; modify Ron to Qspice
.model Z5 D(Ron=1m Roff=1G Vfwd=0 Vrev=5)

* Subcircuit in equivalent for SW with Vser and Ilimit
*.model HOUT SW(Ron=0.68 Roff=220k Vt=3.25 Vh=-0.7 Vser=1.5 Ilimit=3)
.subckt HOUT + - +C -C Vser=1.5 Ilimit=3
S1 + N001 +C -C SWq
VS1 N002 N001 Vser
IS1 N003 N002 Ilimit Vsat=100m
DS1 - N003 Di
.model Di D Ron=1m Roff=100Meg Vfwd=0
.model SWq SW Ron=0.68 Roff=220k Vt=3.25 Vh=-0.7
.ends HOUT

* Subcircuit in equivalent for SW with Vser and Ilimit
*.model LOUT SW(Ron=2.2 Roff=220k Vt=3.25 Vh=-0.7 Vser=0.2 Ilimit=3)
.subckt LOUT + - +C -C Vser=0.2 Ilimit=3
S1 + N001 +C -C SWq
VS1 N002 N001 Vser
IS1 N003 N002 Ilimit Vsat=100m
DS1 - N003 Di
.model Di D Ron=1m Roff=100Meg Vfwd=0
.model SWq SW Ron=2.2 Roff=220k Vt=3.25 Vh=-0.7
.ends LOUT

.ends UC3875
*