Skip to main content

7V Regulated Curcuit (Copy)

JO

john-rogers

·

Created Oct 27, 2026

·

Updated Oct 27, 2026

Schematic preview for 7V Regulated Curcuit (Copy)
Details

Components

3


Schematic

Yes


Simulation

DC operating point


Copies

Not copied yet

Tags

No tags yet.

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

Resistor

Generic

—

3

Official

DC Voltage Source

Generic

—

1

Official

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    * UNPUBLISHED LICENSED SOFTWARE *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)
.end

Try this circuit yourself

Free to get started. No download — runs in your browser with a full SPICE engine.