7V Regulated Curcuit (Copy)
JO
john-rogers
·
Created Oct 27, 2026
·
Updated Oct 27, 2026

Details
Components
3
Schematic
Yes
Simulation
DC operating point
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About this circuit
Estimate LM317 output, regulator heat, load current and efficiency. Admin-maintained calculator source: preserve the reviewed electrical topology and designators; layout, labels and mapped defaults remain editable.
Components used
Components used
3 components
NameManufacturerMPNCountType
SPICE netlist
* **************************************************
* Generated from CircuitSim Schematic
**************************************************
X_LM317 N1 N2 N3 UPC317H_574a6ae1
R_R1 N2 N3 1K Resistor_1d9c8cf9a__R_R1
R_R2 N3 0 6K Resistor_1d9c8cf9a__R_R2
R_R3 N2 0 10K Resistor_1d9c8cf9a__R_R3
V_V1 N1 0 dc 12 ac 0 0 distof1 0 0 distof2 0 0
E_VP1 VP1 0 N2 0 1
**************************************************
* Models and supporting definitions follow
**************************************************
* CircuitSim component model: LM317 adjustable voltage regulator
.MODEL UPC317H_574a6ae1_DMOD1 D
.subckt UPC317H_574a6ae1 3 1 2
* Model Generated by MODPEX *
*Copyright(c) Symmetry Design Systems*
* All Rights Reserved *
* UNPUBLISHED LICENSED SOFTWARE *
* Contains Proprietary Information *
* Which is The Property of *
* SYMMETRY OR ITS LICENSORS *
*Commercial Use or Resale Restricted *
* by Symmetry License Agreement *
* Model generated on Sep 8, 97
* MODEL FORMAT: SPICE3
*Rev. Date: Dec. 20, 1994
*Positive Adjustable Regulator
*External Node Designations
*node 1: VREF (OUTPUT)
*node 2: Ground (Common)
*node 3: Line Voltage
ECCX 131 2 135 2 1.0
VXX 133 2 DC 0
FSET6 2 135 VSENS2 1
FPP 3 2 VXX 1.0
R_YY 31 2 1e6
R_XX 15 2 1e8
R_ZZ 36 2 1e6
R_QQ 65 2 1e8
RXX 1 2 1e8
VSENS1 10 1 DC 0
ISET 2 15 DC 1e-3
DON1 15 16 UPC317H_574a6ae1_DMOD1
VSENS2 16 19 DC 0
DON2 15 17 UPC317H_574a6ae1_DMOD1
EON2 18 2 3 2 1
FYY 3 2 VSENS1 1
DON3 15 27 UPC317H_574a6ae1_DMOD1
VDROP3 28 27 DC 2
EON3 28 2 3 2 4
ELINE 13 42 66 2 1
FSET2 2 36 VSENS2 1
DSC1 36 35 UPC317H_574a6ae1_DMOD1
RCL1 36 37 10
DSC2 37 38 UPC317H_574a6ae1_DMOD1
ESCCON 38 39 30 2 1
VSCCON 39 40 DC 0
FSC 19 2 VSCCON 1
FSET3 2 31 VSENS2 1
DOV1 31 32 UPC317H_574a6ae1_DMOD1
EOV1 32 2 3 1 1
DOV2 31 33 UPC317H_574a6ae1_DMOD1
ISET4 2 30 DC 1e-3
ELOAD 41 2 77 2 -1
ERIPPLE 42 41 72 2 1
EREF 12 13 19 2 1
E3 52 2 3 2 1
CBYPS 54 2 0.001
VORB 54 60 DC 0
RB 60 2 1e3
RBR 72 2 1000
CBS2 52 71 1
RSTEP 77 2 1
FRB 2 65 VORB 1
DRB2 65 67 UPC317H_574a6ae1_DMOD1
VXRB 67 68 DC -1
EXRB 68 2 1 2 1
DRB1 65 66 UPC317H_574a6ae1_DMOD1
RB1 66 2 1000
*-- DMOD1 DEFAULT PARAMETERS
*IS=1e-14 RS=0 N=1 TT=0 CJO=0
*VJ=1 M=0.5 EG=1.11 XTI=3 FC=0.5
*KF=0 AF=1 BV=inf IBV=1e-3 TNOM=27
EXX 132 131 3 131 0.006
RST6 135 2 10000
RIQX 133 132 200000 tc1=-0.001
RSET 19 2 1250 tc1=2e-05 tc2=9.8e-08
RS1 10 12 0.0033
VDROPX 18 17 1.26
HSENSE1 35 2 VSENS1 4.54545
RISC 30 2 10000 tc1=-0.0006
ROV 34 2 35000
VOV 33 34 15
EOV2 2 40 34 2 0.181818
FIQD 3 2 VSENS1 1e-07
RY 52 54 8e+06
RA 72 73 2177.21
RYR 71 72 315228
CRA 52 73 1.67142e-09
HSTEP 76 2 VSENS1 0.2
CSTEP 76 77 1e-05
.ENDS UPC317H_574a6ae1
.model Resistor_1d9c8cf9a__R_R1 r(tc1=0 tc2=0 tnom=27)
.model Resistor_1d9c8cf9a__R_R2 r(tc1=0 tc2=0 tnom=27)
.model Resistor_1d9c8cf9a__R_R3 r(tc1=0 tc2=0 tnom=27)
**************************************************
* Simulation settings
**************************************************
.op
.save V(VP1)
.endTry this circuit yourself
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