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details Flyback convertor 800v with auxiliary supply output 50w 18v

Thread Summary

The user is experiencing issues maintaining a constant 18V 50W output in a flyback converter using the LT1241 IC. The output voltage fluctuates between 17-18V and the power is around 51-52W, with noticeable bumps in the waveform. The final answer suggests that the snubber circuit may need to be adjusted to smooth out the waveform. The user provided the netlist and relevant library files for the LT1241 and IMZA120R014M1H_L3 MOSFET.
AI Generated Content
Category: Hardware
Product Number: FLY8001850

Issue : 18V 50w output is achieved the issue not able to maintain 18v 50w constant
Netlist:
* C:\Users\Mohammed Aman\Downloads\FlyBack-AD-5 W.asc
* Generated by LTspice 26.0.2 for Windows.
R1 N012 0 .22
C1 N019 0 220p
C2 N017 0 .1µ
C3 N016 N015 .01µ
R2 N015 N011 200k
R3 N017 N019 12K
R4 N011 0 20k
R5 N012 N018 1k
R6 N014 N013 12
R7 N006 N011 124k
C4 N006 0 .22µ
C5 N007 0 100p
D1 N007 N006 BAT54
C6 N005 0 22µ
R8 N010 N005 39
D2 N008 N010 BAT54
R9 IN N018 1.32Meg
R10 IN N003 27k
C7 IN N003 470p
L1 N001 0 98µ Rser=.05 Rpar=2K
L2 N009 0 12µ Rser=.1 Rser=1m
L3 N004 IN 450µ Rser=.05 Rpar=5K
D3 N001 N002 MBRS340
C8 N002 0 14.8µ Rser=.1
L4 N002 OUT 1µ
C9 OUT 0 14.8µ Rser=.1
V1 IN 0 800
D4 0 N005 BZX84C15L
D5 N004 N003 MURS320
R12 N008 N007 500
R13 IN N005 400K
X§U1 N016 N011 N018 N019 0 N013 N005 N017 LT1241 ;§pnba COMP)FB)Isense)Rt/Ct)GND)Output)Vcc)Vref
D6 0 N013 BAT54
X§U2 N004 N014 N012 N012 NC_01 NC_02 IMZA120R014M1H_L3 ;§pnba DRAIN)GATE)SOURCE)SOURCESENSE)TJ)TCASE
R11 OUT 0 6.48
R14 N009 N008 4.7
.model D D
.lib C:\Users\Mohammed Aman\AppData\Local\LTspice\lib\cmp\standard.dio
K1 L1 L2 L3 .98
.tran 3m
* Library below included based on ModelFile attribute of instance X§U2 (C:\Users\Mohammed Aman\Downloads\Infineon-CoolSiC_1200V_Gen1_Trench_MOSFET-SPICE-v01_05-EN\IMZA120R014M1H_L3.asy)
.lib IMW-IMZA120RXXXM1H_7-40mOhm_v1.4.lib
* Library below included based on ModelFile attribute of instance X§U1 (C:\Users\Mohammed Aman\AppData\Local\LTspice\lib\sym\PowerProducts\LT1241.asy)
.lib LT1241.sub
.backanno
.end