SPICE MODEL of LM7824 SIMetrix in SPICE PARK
0 likes592 views
The document is a device modeling report for the LM7824 voltage regulator, detailing its circuit configuration, characteristics, and simulation results. Key parameters, including reference voltage and output impedance, are evaluated under various conditions, with comparisons of measured versus simulated values. The report includes tables comparing current, voltage drops, ripple rejection, and output characteristics, highlighting the accuracy of simulated data.
SPICE MODEL of LM7824 SIMetrix in SPICE PARK
- 1. Device Modeling Report COMPONENTS: VOLTAGE REGULATOR PART NUMBER: LM7824 MANUFACTURER: FAIRCHILD SEMICONDUCTOR Panasonic Bee Technologies Inc. All Rights Reserved Copyright (c) Bee Technologies Inc. 2010 1
- 2. CIRCUIT CONFIGURATION U1 LM7824 IN OUT GND MODEL PARAMETER Model Model description parameter VREF Reference Voltage N Emission Coefficient BETA Tranconductance of JFET Transistor VAF Early Voltage of Output Pass Transistor CPZ Output Impedance Zero Capacitor RB2 Base Resistance of Output Limit Voltage Source ESC1 Coefficient of Current Limit Voltage Source ESC2 Coefficient of Current Limit Voltage Source EFB1 Coefficient of Foldback Current Voltage Source EFB2 Coefficient of Foldback Current Voltage Source EFB3 Coefficient of Foldback Current Voltage Source EB Non-ideal Base-Collector Diode Saturation Current All Rights Reserved Copyright (c) Bee Technologies Inc. 2010 2
- 3. Input-Output Voltage Differential Characteristics Simulation Result 30 25 20 OUTPUT / V 15 10 5 0 0 5 10 15 20 25 30 35 40 V1/V 5V/div Evaluation Circuit U1 LM7824 OUTPUT IN OUT GND 0 1A V1 C1 C2 I1 330n 100n Comparison Table Condition: IO = 1A, VI = 33V, CI = 0.33μF, CO = 0.1μF Parameter Measurement Simulation %Error Vdrop(V) 2.000 1.960 -2.00 All Rights Reserved Copyright (c) Bee Technologies Inc. 2010 3
- 4. Ripple Rejection (RR) Characteristics Simulation Result 38 U1-IN / V 34 30 26 OUTPUT / V 24.034 24.032 24.03 24.028 24.026 0 5 10 15 20 25 30 35 40 Time/mSecs 5mSecs/div Evaluation Circuit U1 LM7824 OUTPUT IN OUT GND AC 1 0 Sine(0 5 120 0 0) V1 30 C1 C2 R1 33 0.33uF 0.1uF V2 Comparison Table Condition: IO = 500mA, VI = 33V, CI = 0.33μF, CO = 0.1μF, f = 120Hz, VI = 28V to 38V Parameter Measurement Simulation %Error RR(dB) 67.000 67.532 0.79 All Rights Reserved Copyright (c) Bee Technologies Inc. 2010 4
- 5. Output Characteristics Simulation Result 30 25 20 :OUT / V 15 10 5 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 IRL/A 200mA/div Evaluation Circuit U1 LM7824 IN IN OUT OUT GND V=V(1,0)*(V(4, 0)-1) B1 4 V=V(2,0)+V(3,0) B2 33 2 3 V1 C1 C2 5 Pulse(10 50m 50m 500m 50n 50n 600m) 0.33uF 0.1uF 1 V2 5 Pulse(0 100 0 50n 50n 50m 600m) 10 100Meg 100Meg 100Meg V3 RL R2 R3 R4 Comparison Table Condition: IO = 250mA to 750mA, VI = 33V, CI = 0.33μF, CO = 0.1μF Parameter Measurement Simulation %Error VO(V) 24.000 24.041 0.17 IPK(A) 2.200 2.196 -0.18 All Rights Reserved Copyright (c) Bee Technologies Inc. 2010 5