Diode Model Evalation Manual for LTspice

Diode Model Evaluation Manual for LTspice

All Rights Reserved Copyright (C) Bee Technologies Corporation 2011

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Contents

1. Library Files and Symbol Files Location

2. Forward Characteristic (IV)

3. Capacitance Characteristic (CV)

4. Reverse Recovery Characteristic (Trr)

Bee Technologies Inc.25APR2011

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1) Copy LTspice symbols files from D:\model\S3L60_s to C:\Program Files\LTC\LTspiceIV\lib\sym

2) Copy LIB files from D:\model\S3L60_sto C:\Program Files\LTC\LTspiceIV\lib\sub

1.Library Files and Symbol Files Location

2All Rights Reserved Copyright (C) Bee Technologies Corporation 2011


Evaluation Circuit Simulation Result


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Draw circuit as shown in the figure above. The circuit consists of a DC voltage source V1, a very small resistor R1, and the diode.


Simulation Settings 【 Reference 】 Datasheet

Select Edit then SPICE Analysis, select DC Sweep and enter the parameters as shown. The Voltage source is V1, that is swept to match the device characteristics informed by the datasheet, from Start value=0 to End value=2V with the Increment=1m.


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Sweep: 0 ~ 2V


Add the diode library by using SPICE Directive, type the file name of the library (.lib S3L60_s.lib) the select OK.


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Adding the Library



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Draw circuit as shown in the figure above, that consist of a VPULSE V1 as a DC bias source, a VDC Vsense (0V) as a current sensor , and the diode.



Right click on the voltage source V1 Select Pulse Modify the Attributes

• Pulse source• Initial voltage=0V• Pulse voltage=600V• Delay time=0• Rise time=1u• Fall time=50n• Pulse width=5u• Period=10u


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The maximum DC bias voltage of the capacitance evaluation is set by entering V2=600V, the other parameter are the default value, as shown.

Configuring the Pulse Source


Select Transient and enter the parameters as shown (This is the default setting, usually can be use with any diode).


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Simulation Settings


• Right click on the plot pane the select Add Trace, then add the expression: I(V2)/(600V*/1u), to show the capacitance curve (*600V is the V2 value of the pulse source).

• Click at X axis change the Quantity Plotted from time to V(rev) then set the scale as Left=0.5V, Right=400V in Logarithmic scale


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4. Reverse Recovery Characteristic


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Draw circuit as shown in the figure above, that consist of a VPULSE V1 as a pulse source, a Resistor R1=50, and the diode.



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• Right click the V1, modify the attributes to PULSE(-9.1 10.8 12n 10n 12n 20u 50u) as V1=-9.1, V2=10.8, TD=12ns, TR=10ns, TF=12ns, PW=20u, PER=50u.

• V1(-9.1) is the value near -10V, used to adjust the IR to be -200mA.• V2(10.8) is the value near 10V, used to adjust the IF to be 200mA .• TF (Fall Time) is used to adjust the slope.

adjust V1

adjust V2IF

IR

Configuring the Pulse Source


Select Transient and enter the parameters as shown (the Stop Time must be over than the pulse width(PW) of the voltage source).


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Simulation Settings


• To solve “?s” problem click Tool>Control Panel>Netlist Options then select Covert “µ” to “u”[*].


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“?s”


• Left click on the X axis then set the scale to Left=19.96us Right=20.14us and tick=20ns.


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simulation Result【 Reference 】 Measurement Waveform

• The scale is set to match the measurement waveform for easily comparison.


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Time

0.96us 1.00us 1.04us 1.08us 1.12us 1.16usI(R1)

-400mA

-300mA

-200mA

-100mA

-0mA

100mA

200mA

300mA

400mA

Diode Model Evalation Manual for LTspice

Technology

pulse voltage

dc voltage source v1

characteristic ivadd

vpulse v1

diode library

pulse width

v2 value

dc bias source