Version 4
SHEET 1 1072 912
WIRE -1472 -1456 -1504 -1456
WIRE -1344 -1456 -1392 -1456
WIRE -1232 -1456 -1280 -1456
WIRE -960 -1456 -1056 -1456
WIRE -832 -1456 -880 -1456
WIRE -720 -1456 -752 -1456
WIRE -608 -1456 -720 -1456
WIRE -576 -1456 -608 -1456
WIRE -1056 -1392 -1056 -1456
WIRE -720 -1392 -720 -1456
WIRE -1504 -1376 -1504 -1456
WIRE -1408 -1376 -1504 -1376
WIRE -1232 -1376 -1232 -1456
WIRE -1232 -1376 -1344 -1376
WIRE -1104 -1376 -1232 -1376
WIRE -1312 -1312 -1312 -1344
WIRE -608 -1280 -608 -1456
WIRE -720 -1264 -720 -1328
WIRE -1104 -1248 -1104 -1328
WIRE -1056 -1248 -1056 -1312
WIRE -1312 -1200 -1312 -1232
WIRE -1504 -1184 -1504 -1376
WIRE -1344 -1184 -1504 -1184
WIRE -1232 -1168 -1232 -1376
WIRE -1232 -1168 -1280 -1168
WIRE -1344 -1152 -1408 -1152
WIRE -1312 -1120 -1312 -1136
WIRE -1632 -1104 -1712 -1104
WIRE -1504 -1104 -1504 -1184
WIRE -1504 -1104 -1552 -1104
WIRE -1712 -1072 -1712 -1104
WIRE -896 -1072 -944 -1072
WIRE -752 -1072 -816 -1072
WIRE -608 -1072 -608 -1200
WIRE -608 -1072 -688 -1072
WIRE -1408 -1024 -1408 -1152
WIRE -1312 -1024 -1312 -1040
WIRE -1504 -992 -1504 -1104
WIRE -944 -992 -944 -1072
WIRE -944 -992 -1504 -992
WIRE -816 -992 -944 -992
WIRE -608 -992 -608 -1072
WIRE -608 -992 -736 -992
WIRE -576 -992 -608 -992
WIRE -1712 -976 -1712 -992
FLAG -1408 -1024 0
FLAG -576 -1456 loop_out
IOPIN -576 -1456 Out
FLAG -720 -1264 0
FLAG -1312 -1024 0
FLAG -576 -992 loop_in
IOPIN -576 -992 In
FLAG -1056 -1248 0
FLAG -1104 -1248 0
FLAG -1312 -1344 0
FLAG -1712 -976 0
SYMBOL ind -848 -1440 R270
WINDOW 0 32 56 VTop 0
WINDOW 3 5 56 VBottom 0
SYMATTR InstName L2
SYMATTR Value 20µ
SYMBOL cap -736 -1392 R0
SYMATTR InstName C6
SYMATTR Value 1µ0
SYMBOL voltage -1712 -1088 R0
WINDOW 0 93 18 Right 0
WINDOW 3 179 52 Right 0
WINDOW 123 105 82 Right 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vref1
SYMATTR Value PULSE(-1 1 0 1u 1u 499u 1m)
SYMATTR Value2 AC 1m
SYMBOL res -720 -1008 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 56k
SYMBOL res -1488 -1472 M90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 5k1
SYMBOL res -800 -1088 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 6k2
SYMBOL res -864 -1472 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 20m
SYMBOL cap -1344 -1472 M90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL cap -1408 -1392 M90
WINDOW 0 0 32 VBottom 0
WINDOW 3 49 4 VBottom 0
SYMATTR InstName C2
SYMATTR Value 110p
SYMBOL cap -688 -1088 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C3
SYMATTR Value 91p
SYMBOL UniversalOpamp2 -1312 -1168 R0
SYMATTR InstName U1
SYMATTR Value2 Avol=1000Meg GBW=1000Meg Slew=1000Meg
SYMBOL voltage -1312 -1216 M180
WINDOW 0 -41 57 Right 0
WINDOW 3 37 93 Right 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vref3
SYMATTR Value 5
SYMBOL e -1056 -1408 R0
WINDOW 0 46 19 Left 0
WINDOW 3 47 61 Left 0
SYMATTR InstName E1
SYMATTR Value 20
SYMBOL voltage -1312 -1024 M180
WINDOW 0 107 51 Right 0
WINDOW 3 37 93 Right 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vref2
SYMATTR Value 5
SYMBOL res -624 -1296 R0
SYMATTR InstName R5
SYMATTR Value 1
SYMBOL res -1536 -1120 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R6
SYMATTR Value 5k6
TEXT -984 -1312 Left 0 !;ac dec 20 1 1000k
TEXT -1112 -1528 Left 0 ;PWM-Modulator and Power Stage ("Plant")
TEXT -1496 -1536 Left 0 ;Type 3 Compensator
TEXT -2240 -1232 Left 0 ;1+2. zero: @30kHz R1*C3 = R2*C1 = 5u3s
TEXT -2240 -1200 Left 0 ;1+2. pole: @270kHz R3*C3 = R2*C2 = 0u6s
TEXT -2240 -1272 Left 0 ;integrator: R1, C1
TEXT -2240 -1336 Left 0 ;Filter-Resonanz: f(L2,C6) @35,6kHz
TEXT -2240 -1168 Left 0 ;Transitfrequenz der Schleifenverstärkung: fc = 90kHz
TEXT -2240 -1536 Left 0 ;Generischer Class-D-Verstärker mit Typ3 Kompensator -
TEXT -2240 -1400 Left 0 ;PWM Takt >= 500kHz -> fc <= 100kHz
TEXT -2240 -1368 Left 0 ;Verstärkung PWM-Modulator -> Ausgang @20V/V
TEXT -2240 -1136 Left 0 ;k-faktor = fpp/fc = fc/fzz = 270/90kHz = 90kHz/30kHz = 3
TEXT -2240 -1072 Left 0 ;Phasenspielraum @fc = 20 Grad
TEXT -2240 -1104 Left 0 ;Schleifenverstärkung @1kHz = 34dB
TEXT -2240 -1440 Left 0 ;Fzz/Fc/Fpp = 30/90/270kHz
TEXT -984 -1272 Left 0 !.tran 2m