SPICE MODEL of LM7915 SIMetrix in SPICE PARK
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This document summarizes the results of modeling a LM7915 voltage regulator component. It includes the component's manufacturer and part number, its circuit configuration, key model parameters, and simulation results comparing the component's input-output voltage differential characteristics, ripple rejection characteristics, and output characteristics to measurement data, showing close matching between simulation and measurement.
SPICE MODEL of LM7915 SIMetrix in SPICE PARK
- 1. Device Modeling Report COMPONENTS: VOLTAGE REGULATOR PART NUMBER: LM7915 MANUFACTURER: FAIRCHILD SEMICONDUCTOR Panasonic Bee Technologies Inc. All Rights Reserved Copyright (c) Bee Technologies Inc. 2010 1
- 2. CIRCUIT CONFIGURATION U1 LM7915 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 0 -2 -4 -6 OUTPUT / V -8 -10 -12 -14 -16 -18 -35 -30 -25 -20 -15 -10 -5 0 V1/V 5V/div Evaluation Circuit 0 1A V1 C1 C0 I1 2.2u 1u GND OUTPUT IN OUT LM7915 U1 Comparison Table Condition: IO = 1A, VI = 23V, CI = 2.2μF, CO = 1μF Parameter Measurement Simulation %Error Vdrop(V) 2.000 1.974 -1.30 All Rights Reserved Copyright (c) Bee Technologies Inc. 2010 3
- 4. Ripple Rejection (RR) Characteristics Simulation Result -16 -18 -20 U1-IN / V -22 -24 -26 -28 -30 -14.992 OUTPUT / V -14.994 -14.996 -14.998 -15 -15.002 0 5 10 15 20 25 30 35 40 Time/mSecs 5mSecs/div Evaluation Circuit -23 V2 C1 C0 2.2u 1u 30 R1 AC 1 0 Sine(0 5 120 0 0) V1 GND OUTPUT IN OUT LM7915 U1 Comparison Table Condition: IO = 500mA, VI = 23V, CI = 2.2μF, CO = 1μF, f = 120Hz, ΔVI = 10V Parameter Measurement Simulation %Error RR(dB) 60.000 59.872 -0.21 All Rights Reserved Copyright (c) Bee Technologies Inc. 2010 4
- 5. Output Characteristics Simulation Result 0 -2 -4 -6 -8 :OUT / V -10 -12 -14 -16 -18 -20 -2.2 -2 -1.8 -1.6 -1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 -0 :RL#p/A 200mA/div Evaluation Circuit 5 100Meg V=V(2,0)+V(3,0) RL R2 B2 -23 2 3 V1 C1 C2 5 Pulse(10 50m 50m 500m 50n 50n 600m) 1 100Meg 100Meg 5 Pulse(0 100 0 50n 50n 50m 600m) 0.33uF 0.1uF V2 V=V(1,0)*(V(4, 0)-1) R3 R4 V3 B1 GND 4 IN IN OUT OUT LM7915 U1 Comparison Table Condition: IO = 250mA to 750mA, VI = 23V, CI = 2.2μF, CO = 1μF Parameter Measurement Simulation %Error VO(V) -15.000 -14.998 -0.01 IPEAK(A) 2.200 2.147 -2.41 All Rights Reserved Copyright (c) Bee Technologies Inc. 2010 5