This document summarizes the simulation results of a voltage regulator component. It includes specifications of the LM7915 voltage regulator such as the manufacturer, reference voltage, and model parameters. Simulation results are shown for the input-output voltage differential characteristics, ripple rejection characteristics, and output characteristics when providing currents from 250mA to 750mA. The simulations match the expected measurements with less than 2.36% error.

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
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2. MODEL PARAMETER
Pspice
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
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3. Input-Output Voltage Differential Characteristics
Simulation Result
-20V
(-17.029,-14.900)
-15V
-10V
-5V
0V
0V -5V -10V -15V -20V -25V -30V -35V
V(Output)
V_VI
Evaluation Circuit
0
VI CI CO Io
2.2uF 1uF
1Adc
Input GND Output
IN OUT
U1
LM7915
Comparison Table
Condition: IO = 1A, VI = 23V, CI = 2.2μF, CO = 1μF
Parameter Measurement Simulation %Error
Vdrop(V) 2.000 2.029 1.45
All Rights Reserved Copyright (c) Bee Technologies Inc. 2010
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4. Ripple Rejection (RR) Characteristics
Simulation Result
-30V
-28V
-26V
-24V
-22V
-20V
SEL>>
-16V
V(INPUT)
-14.990V
(14.428m,-14.992)
-14.995V
-15.000V (10.228m,-15.002)
0s 4ms 8ms 12ms 16ms 20ms 24ms 28ms 32ms 36ms 40ms
V(Output)
Time
Evaluation Circuit
-23Vdc
0 Io
CI CO
VI
VIRR 2.2u 1u 0.5Adc
VOFF = 0
VAMPL = 5
FREQ = 120
Input GND Output
IN OUT
U1
LM7915
Comparison Table
Condition: IO = 500mA, VI = 23V, CI = 2.2μF, CO = 1μF, f = 120Hz, ΔVI = 10V
Parameter Measurement Simulation %Error
RR(dB) 60.000 59.860 -0.23
All Rights Reserved Copyright (c) Bee Technologies Inc. 2010
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5. Output Characteristics
Simulation Result
-20V
(500.000m,-14.999) (2.1480,-14.713)
-10V
0V
0A 1.0A 2.0A 3.0A
V(Output)
I(RL)
Evaluation Circuit
E1
EVALUE
V(1,Output)*(V(%IN+, %IN-)-1)
V(2,0)+V(3,0)
0 OUT+ IN+
CI CO 1 OUT- IN-
OUT
VI 2.2u 1u RL
5 R4
-23Vdc 100MEG
Input GND Output
IN OUT
U1 2 0 3
LM7915
V1 = 10 V3 V1 = 0 V4
V2 = 0.05 V2 = 100
TD = 50m R5 TD = 0 R6
TR = 500m 100MEG TR = 50n 100MEG
TF = 50n TF = 50n
PW = 50n PW = 50m
PER = 600m PER = 600m
0
Comparison Table
Condition: IO = 250mA to 750mA, VI = 23V, CI = 2.2μF, CO = 1μF,
Parameter Measurement Simulation %Error
VO(V) -15.000 -14.999 0.01
IPEAK(A) 2.200 2.148 -2.36
All Rights Reserved Copyright (c) Bee Technologies Inc. 2010
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