* SPICE netlist
R8 DB N031 {R_TRIM}
R9 N002 N003 {R_ISENSE_INH}
Q5 N011 N007 N003 0 TIP42C
Q8 0 DB N020 0 2N3906
Q9 DB DB N019 0 2N3906
R10 N001 VT 145
R11 VT N018 145
RT N001 VT {300*exp(beta*(1/(TEMP+273.15)-1/(25+273.15)))}
D2 N011 N007 BAT54SHY
C_TRIM N002 N003 180n
D6 N030 N001 BZX84C6V2L
R15 N036 0 4.7k
Q10 0 N036 N031 0 2N3906
Q11 N036 N036 N030 0 2N3906
S2 N022 N011 V_SW 0 LDSW
V4 V_SW 0 PULSE(1 0 50n 1n 1n 150n 500n 10)
R_LOAD N022 N026 {R_INH}
L_LOAD1 N032 N026 {L_FERRITE*8192}
L_LOAD2 N032 0 {L_FERRITE*8192}
R1 N002 N004 {R_ISENSE_INH}
Q1 N012 N008 N004 0 TIP42C
Q2 0 N021 N008 0 2N3906
D1 N012 N008 BAT54SHY
C_TRIM1 N002 N004 180n
S1 N023 N012 N015 0 LDSW
V1 N015 0 PULSE(1 0 150n 1n 1n 150n 500n 10)
R_LOAD1 N023 N027 {R_INH}
L_LOAD3 N033 N027 {L_FERRITE*8192}
L_LOAD4 N033 0 {L_FERRITE*8192}
Q3 N001 N020 N021 0 2N3904
Q6 0 N021 N007 0 2N3906
R4 N021 0 1k
Q13 N019 N019 N018 0 TIP42C
R5 N020 N001 200
R6 N002 N005 {R_ISENSE_XY}
Q4 N013 N009 N005 0 TIP42C
Q7 0 N021 N009 0 2N3906
D3 N013 N009 BAT54SHY
C_TRIM2 N002 N005 330n
S3 N024 N013 N016 0 LDSW
V2 N016 0 PULSE(1 0 250n 1n 1n 150n 500n 10)
R_LOAD2 N024 N028 {R_X}
L_LOAD5 N034 N028 {L_FERRITE*128*16}
L_LOAD6 N034 0 {L_FERRITE*128*16}
R12 N002 N006 {R_ISENSE_XY}
Q12 N014 N010 N006 0 TIP42C
Q14 0 N021 N010 0 2N3906
D4 N014 N010 BAT54SHY
C_TRIM3 N002 N006 330n
S4 N025 N014 N017 0 LDSW
V5 N017 0 PULSE(1 0 350n 1n 1n 150n 500n 10)
R_LOAD3 N025 N029 {R_Y}
L_LOAD7 N035 N029 {L_FERRITE*128*16}
L_LOAD8 N035 0 {L_FERRITE*128*16}
R2 V_HIGH N002 0.1m
R3 V_HIGH N001 0.1m
V6 V_HIGH 0 {V_HIGH}
;.step temp 0 50 2
;.step param V_HIGH 18 25 1
.param beta=3468
;.step param beta 3100 4000 100
.param L_FERRITE=1p
.param R_X=25 R_Y=19 R_INH=15
.param R_ISENSE_INH=0.365
;.step param R_TRIM 4.1k 4.2k 20
.param R_TRIM=4.2k
.param V_HIGH 20
;.param temp 25
K L_LOAD1 L_LOAD2 1
.tran 10u
K2 L_LOAD3 L_LOAD4 1
K3 L_LOAD5 L_LOAD6 1
K4 L_LOAD7 L_LOAD8 1
.param R_ISENSE_XY=0.31

* LTspice schematic (.asc)
Version 4.1
SHEET 1 6368 2000
WIRE -3040 -1000 -3120 -1000
WIRE -2912 -1000 -3040 -1000
WIRE -2272 -1000 -2832 -1000
WIRE -1936 -1000 -2272 -1000
WIRE -1520 -1000 -1936 -1000
WIRE -1248 -1000 -1520 -1000
WIRE -864 -1000 -944 -1000
WIRE -736 -1000 -864 -1000
WIRE -368 -1000 -656 -1000
WIRE -256 -1000 -368 -1000
WIRE 656 -1000 -256 -1000
WIRE 768 -1000 656 -1000
WIRE 1776 -1000 768 -1000
WIRE 1888 -1000 1776 -1000
WIRE 2848 -1000 1888 -1000
WIRE 2960 -1000 2848 -1000
WIRE 3152 -1000 2960 -1000
WIRE -368 -968 -368 -1000
WIRE 656 -968 656 -1000
WIRE 1776 -968 1776 -1000
WIRE 2848 -968 2848 -1000
WIRE -256 -952 -256 -1000
WIRE 768 -952 768 -1000
WIRE 1888 -952 1888 -1000
WIRE 2960 -952 2960 -1000
WIRE -1936 -888 -1936 -1000
WIRE -1936 -888 -2128 -888
WIRE -368 -856 -368 -904
WIRE -256 -856 -256 -872
WIRE -256 -856 -368 -856
WIRE 656 -856 656 -904
WIRE 768 -856 768 -872
WIRE 768 -856 656 -856
WIRE 1776 -856 1776 -904
WIRE 1888 -856 1888 -872
WIRE 1888 -856 1776 -856
WIRE 2848 -856 2848 -904
WIRE 2960 -856 2960 -872
WIRE 2960 -856 2848 -856
WIRE -2128 -824 -2128 -888
WIRE -1936 -824 -1936 -888
WIRE -2128 -696 -2128 -744
WIRE -1984 -696 -2128 -696
WIRE -1936 -696 -1936 -744
WIRE -1936 -696 -1984 -696
WIRE -256 -680 -256 -856
WIRE 768 -680 768 -856
WIRE 1888 -680 1888 -856
WIRE 2960 -680 2960 -856
WIRE -2272 -648 -2272 -1000
WIRE -1936 -632 -1936 -696
WIRE -416 -632 -832 -632
WIRE -320 -632 -416 -632
WIRE 608 -632 384 -632
WIRE 704 -632 608 -632
WIRE 1728 -632 1504 -632
WIRE 1824 -632 1728 -632
WIRE 2800 -632 2576 -632
WIRE 2896 -632 2800 -632
WIRE -416 -536 -416 -632
WIRE -368 -536 -416 -536
WIRE -256 -536 -256 -584
WIRE -256 -536 -304 -536
WIRE 608 -536 608 -632
WIRE 656 -536 608 -536
WIRE 768 -536 768 -584
WIRE 768 -536 720 -536
WIRE 1728 -536 1728 -632
WIRE 1776 -536 1728 -536
WIRE 1888 -536 1888 -584
WIRE 1888 -536 1840 -536
WIRE 2800 -536 2800 -632
WIRE 2848 -536 2800 -536
WIRE 2960 -536 2960 -584
WIRE 2960 -536 2912 -536
WIRE -144 -440 -208 -440
WIRE -32 -440 -144 -440
WIRE 992 -440 816 -440
WIRE 2112 -440 1936 -440
WIRE 3184 -440 3008 -440
WIRE -256 -408 -256 -536
WIRE -32 -408 -32 -440
WIRE 768 -408 768 -536
WIRE 992 -408 992 -440
WIRE 1888 -408 1888 -536
WIRE 2112 -408 2112 -440
WIRE 2960 -408 2960 -536
WIRE 3184 -408 3184 -440
WIRE -1936 -392 -1936 -552
WIRE -208 -392 -208 -440
WIRE 816 -392 816 -440
WIRE 1936 -392 1936 -440
WIRE 3008 -392 3008 -440
WIRE -1776 -344 -1872 -344
WIRE -208 -296 -208 -344
WIRE -160 -296 -208 -296
WIRE -32 -296 -32 -328
WIRE -32 -296 -160 -296
WIRE 816 -296 816 -344
WIRE 864 -296 816 -296
WIRE 992 -296 992 -328
WIRE 992 -296 864 -296
WIRE 1936 -296 1936 -344
WIRE 1984 -296 1936 -296
WIRE 2112 -296 2112 -328
WIRE 2112 -296 1984 -296
WIRE 3008 -296 3008 -344
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WIRE 3184 -296 3184 -328
WIRE 3184 -296 3056 -296
WIRE -1520 -280 -1520 -1000
WIRE -1936 -264 -1936 -296
WIRE -1776 -264 -1776 -344
WIRE -1776 -264 -1936 -264
WIRE -160 -248 -160 -296
WIRE 864 -248 864 -296
WIRE 1984 -248 1984 -296
WIRE 3056 -248 3056 -296
WIRE -1248 -184 -1248 -1000
WIRE -1520 -136 -1520 -200
WIRE -1312 -136 -1520 -136
WIRE -1248 -24 -1248 -88
WIRE -1024 -24 -1248 -24
WIRE 176 -24 -1024 -24
WIRE 1296 -24 176 -24
WIRE 2368 -24 1296 -24
WIRE -3184 40 -3184 8
WIRE -832 248 -832 -632
WIRE 384 248 384 -632
WIRE 1504 248 1504 -632
WIRE 2576 248 2576 -632
WIRE -1936 264 -1936 -264
WIRE -1520 264 -1520 -136
WIRE -1024 296 -1024 -24
WIRE -896 296 -1024 296
WIRE 176 296 176 -24
WIRE 320 296 176 296
WIRE 1296 296 1296 -24
WIRE 1440 296 1296 296
WIRE 2368 296 2368 -24
WIRE 2512 296 2368 296
WIRE -1824 312 -1872 312
WIRE -1584 312 -1824 312
WIRE -1936 408 -1936 360
WIRE -1824 408 -1824 312
WIRE -1824 408 -1936 408
WIRE -256 408 -256 -328
WIRE 768 408 768 -328
WIRE 1888 408 1888 -328
WIRE 2960 408 2960 -328
WIRE -1936 504 -1936 408
WIRE -1936 568 -1936 504
WIRE -256 600 -256 488
WIRE 768 600 768 488
WIRE 1888 600 1888 488
WIRE 2960 600 2960 488
WIRE -1248 616 -1248 -24
WIRE -2272 696 -2272 -584
WIRE -1936 696 -1936 648
WIRE -256 712 -256 680
WIRE 768 712 768 680
WIRE 1888 712 1888 680
WIRE 2960 712 2960 680
WIRE -2112 744 -2208 744
WIRE -2000 744 -2112 744
WIRE -2272 824 -2272 792
WIRE -2112 824 -2112 744
WIRE -2112 824 -2272 824
WIRE -2272 872 -2272 824
WIRE -2272 968 -2272 952
WIRE -2272 968 -2704 968
WIRE -2096 968 -2272 968
WIRE -1936 968 -1936 792
WIRE -1936 968 -2096 968
WIRE -1520 968 -1520 360
WIRE -1520 968 -1936 968
WIRE -1248 968 -1248 696
WIRE -1248 968 -1520 968
WIRE -832 968 -832 344
WIRE -832 968 -1248 968
WIRE -256 968 -256 792
WIRE -256 968 -832 968
WIRE 384 968 384 344
WIRE 384 968 -256 968
WIRE 768 968 768 792
WIRE 768 968 384 968
WIRE 1504 968 1504 344
WIRE 1504 968 768 968
WIRE 1888 968 1888 792
WIRE 1888 968 1504 968
WIRE 2576 968 2576 344
WIRE 2576 968 1888 968
WIRE 2960 968 2960 792
WIRE 2960 968 2576 968
WIRE 3152 968 2960 968
WIRE -2096 1000 -2096 968
FLAG -2096 1000 0
FLAG -1984 -696 VT
FLAG -1936 504 DB
FLAG -160 -248 0
FLAG -144 -440 V_SW
FLAG 864 -248 0
FLAG 1984 -248 0
FLAG 3056 -248 0
FLAG -864 -1000 V_HIGH
FLAG -3040 -1000 V_HIGH
FLAG -3184 40 0
FLAG -3184 -72 V_HIGH
SYMBOL res -1952 552 R0
SYMATTR InstName R8
SYMATTR Value {R_TRIM}
SYMBOL res -272 -968 R0
SYMATTR InstName R9
SYMATTR Value {R_ISENSE_INH}
SYMBOL pnp -320 -584 M180
SYMATTR InstName Q5
SYMATTR Value TIP42C
SYMBOL pnp -1584 360 M180
SYMATTR InstName Q8
SYMATTR Value 2N3906
SYMBOL pnp -1872 360 R180
SYMATTR InstName Q9
SYMATTR Value 2N3906
SYMBOL res -1952 -840 R0
SYMATTR InstName R10
SYMATTR Value 145
SYMBOL res -1952 -648 R0
SYMATTR InstName R11
SYMATTR Value 145
SYMBOL res -2144 -840 R0
SYMATTR Value {300*exp(beta*(1/(TEMP+273.15)-1/(25+273.15)))}
SYMATTR InstName RT
SYMBOL schottky -304 -552 R90
SYMATTR InstName D2
SYMATTR Value BAT54SHY
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap -384 -968 R0
SYMATTR InstName C_TRIM
SYMATTR Value 180n
SYMBOL zener -2256 -584 R180
SYMATTR InstName D6
SYMATTR Value BZX84C6V2L
SYMBOL res -2288 856 R0
SYMATTR InstName R15
SYMATTR Value 4.7k
SYMBOL pnp -2000 792 M180
SYMATTR InstName Q10
SYMATTR Value 2N3906
SYMBOL pnp -2208 792 R180
SYMATTR InstName Q11
SYMATTR Value 2N3906
SYMBOL sw -256 -312 R180
SYMATTR InstName S2
SYMATTR Value LDSW
SYMBOL voltage -32 -424 R0
SYMATTR Value PULSE(1 0 50n 1n 1n 150n 500n 10)
SYMATTR InstName V4
SYMBOL res -272 392 R0
SYMATTR InstName R_LOAD
SYMATTR Value {R_INH}
SYMBOL ind2 -240 696 R180
SYMATTR InstName L_LOAD1
SYMATTR Value {L_FERRITE*8192}
SYMATTR Type ind
SYMBOL ind2 -272 696 R0
SYMATTR InstName L_LOAD2
SYMATTR Value {L_FERRITE*8192}
SYMATTR Type ind
SYMBOL res 752 -968 R0
SYMATTR InstName R1
SYMATTR Value {R_ISENSE_INH}
SYMBOL pnp 704 -584 M180
SYMATTR InstName Q1
SYMATTR Value TIP42C
SYMBOL pnp 320 344 M180
SYMATTR InstName Q2
SYMATTR Value 2N3906
SYMBOL schottky 720 -552 R90
SYMATTR InstName D1
SYMATTR Value BAT54SHY
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 640 -968 R0
SYMATTR InstName C_TRIM1
SYMATTR Value 180n
SYMBOL sw 768 -312 R180
SYMATTR InstName S1
SYMATTR Value LDSW
SYMBOL voltage 992 -424 R0
SYMATTR Value PULSE(1 0 150n 1n 1n 150n 500n 10)
SYMATTR InstName V1
SYMBOL res 752 392 R0
SYMATTR InstName R_LOAD1
SYMATTR Value {R_INH}
SYMBOL ind2 784 696 R180
SYMATTR InstName L_LOAD3
SYMATTR Value {L_FERRITE*8192}
SYMATTR Type ind
SYMBOL ind2 752 696 R0
SYMATTR InstName L_LOAD4
SYMATTR Value {L_FERRITE*8192}
SYMATTR Type ind
SYMBOL npn -1312 -184 R0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL pnp -896 344 M180
SYMATTR InstName Q6
SYMATTR Value 2N3906
SYMBOL res -1264 600 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL pnp -1872 -296 R180
SYMATTR InstName Q13
SYMATTR Value TIP42C
SYMBOL res -1504 -184 R180
SYMATTR InstName R5
SYMATTR Value 200
SYMBOL res 1872 -968 R0
SYMATTR InstName R6
SYMATTR Value {R_ISENSE_XY}
SYMBOL pnp 1824 -584 M180
SYMATTR InstName Q4
SYMATTR Value TIP42C
SYMBOL pnp 1440 344 M180
SYMATTR InstName Q7
SYMATTR Value 2N3906
SYMBOL schottky 1840 -552 R90
SYMATTR InstName D3
SYMATTR Value BAT54SHY
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 1760 -968 R0
SYMATTR InstName C_TRIM2
SYMATTR Value 330n
SYMBOL sw 1888 -312 R180
SYMATTR InstName S3
SYMATTR Value LDSW
SYMBOL voltage 2112 -424 R0
SYMATTR Value PULSE(1 0 250n 1n 1n 150n 500n 10)
SYMATTR InstName V2
SYMBOL res 1872 392 R0
SYMATTR InstName R_LOAD2
SYMATTR Value {R_X}
SYMBOL ind2 1904 696 R180
SYMATTR InstName L_LOAD5
SYMATTR Value {L_FERRITE*128*16}
SYMATTR Type ind
SYMBOL ind2 1872 696 R0
SYMATTR InstName L_LOAD6
SYMATTR Value {L_FERRITE*128*16}
SYMATTR Type ind
SYMBOL res 2944 -968 R0
SYMATTR InstName R12
SYMATTR Value {R_ISENSE_XY}
SYMBOL pnp 2896 -584 M180
SYMATTR InstName Q12
SYMATTR Value TIP42C
SYMBOL pnp 2512 344 M180
SYMATTR InstName Q14
SYMATTR Value 2N3906
SYMBOL schottky 2912 -552 R90
SYMATTR InstName D4
SYMATTR Value BAT54SHY
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL cap 2832 -968 R0
SYMATTR InstName C_TRIM3
SYMATTR Value 330n
SYMBOL sw 2960 -312 R180
SYMATTR InstName S4
SYMATTR Value LDSW
SYMBOL voltage 3184 -424 R0
SYMATTR Value PULSE(1 0 350n 1n 1n 150n 500n 10)
SYMATTR InstName V5
SYMBOL res 2944 392 R0
SYMATTR InstName R_LOAD3
SYMATTR Value {R_Y}
SYMBOL ind2 2976 696 R180
SYMATTR InstName L_LOAD7
SYMATTR Value {L_FERRITE*128*16}
SYMATTR Type ind
SYMBOL ind2 2944 696 R0
SYMATTR InstName L_LOAD8
SYMATTR Value {L_FERRITE*128*16}
SYMATTR Type ind
SYMBOL res -752 -984 R270
SYMATTR InstName R2
SYMATTR Value 0.1m
SYMBOL res -2928 -984 R270
SYMATTR InstName R3
SYMATTR Value 0.1m
SYMBOL voltage -3184 -88 R0
SYMATTR InstName V6
SYMATTR Value {V_HIGH}