DVM - Design Verification Module

Triangle Waveform Load

The Triangle Waveform Load subcircuit models a repeating triangle waveform load current. This load is not used in any test objectives, but you can set a load to use this subcircuit with a Tri() call in the Load column of your testplan.

Other similar pulsed current loads include:

Pulse Load - Single Current Pulse - a single current pulse load with the starting current modeled with a resistor
Pulse Load - Single Pure Current Pulse - a single current pulse load with the starting current modeled without a resistor

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Triangle Waveform Load Parameters
Testplan Entry
Examples

Model Name	Triangle Waveform Load
Simulator		This device is compatible with both the SIMetrix and SIMPLIS simulators.
Parts Selector Menu Location	DVM ▶ Loads ▶ DVM Output Load - 2 Terminal DVM ▶ Loads ▶ DVM Output Load - 3 Terminal DVM ▶ Loads ▶ DVM Output Load - 4 Terminal
Symbol Library	None - the symbol is automatically generated when placed or edited.
Model File	SIMPLIS_DVM_ADVANCED.lb
Subcircuit Name	SIMPLIS_DVM_ADVANCED_LOAD_2T_TRI SIMPLIS_DVM_ADVANCED_LOAD_3T_TRI SIMPLIS_DVM_ADVANCED_LOAD_4T_TRI
Symbols
Schematic - 2 Terminal
Schematic - 3 Terminal
Schematic - 4 Terminal

Triangle Waveform Load Parameters

The following table explains the relevant parameters.

Parameter Name	Default	Data Type	Range	Units	Parameter Description
DRATIO	0.5	Real	0 to 1		The duty cycle ratio for the triangle waveform load
FINAL_CURRENT	750m	Real		A	The peak or maximum current for the triangle waveform load. This can be a numeric value or a symbolic value, such as a percentage of full load.
FREQUENCY	10k	Real	min: > 0	Hz	The frequency of the load pulse
IDLE_IN_POP	0	Real	0 or 1		If set to 0, the load current during the POP analysis is set to the START_CURRENT; otherwise the load will be active during the POP analysis.
LOAD_NAME	LOAD	String	n/a	n/a	Name of the DVM load. This name cannot contain spaces.
OFF_UNTIL_DELAY	0	Real	0 or 1		If set to 1, the load current will be the START_CURRENT until the time specified by TIME_DELAY. If set to 0, the value of TIME_DELAY is interpreted as a phase delay.
PHASE_ANGLE	90	Real		°	The phase angle of the triangle waveform, used only if the USE_PHASE parameter is 1.
START_CURRENT	0	Real		A	The valley or starting current for the triangle waveform load. This can be a numeric value or a symbolic value, such as a percentage of full load.
TIME_DELAY	10u	Real	min: 0	s	The delay before the load current pulse starts. The load behavior before the TIME_DELAY is determined by the OFF_UNTIL_DELAY parameter.
USE_PHASE	0	Real	0 or 1		If set to 1, the load is configured to use the phase angle supplied by the PHASE_ANGLE parameter.

Testplan Entry

To set any managed DVM load to a Triangle Waveform Load subcircuit, place a Tri() testplan entry in the Load column.

The Tri() testplan entry has the following syntax with the arguments taken from the list of parameters above.

Tri(REF, START_CURRENT, FINAL_CURRENT, FREQUENCY, DRATIO)
Tri(REF, START_CURRENT, FINAL_CURRENT, FREQUENCY, DRATIO, OPTIONAL_PARAMETER_STRING)

Argument	Range	Description
REF	n/a	The actual reference designator of the DVM load or the more generic syntax of OUTPUT:n where n is an integer indicating a position in the list of managed DVM loads.
START_CURRENT	n/a	The valley or starting current for the triangle waveform load. This can be a numeric value or a symbolic value, such as a percentage of full load.
FINAL_CURRENT	n/a	The peak or maximum current for the triangle waveform load. This can be a numeric value or a symbolic value, such as a percentage of full load.
FREQUENCY	min: > 0	The frequency of the triangle waveform load
DRATIO	0 to 1	The duty ratio of the load
OPTIONAL_PARAMETER_STRING	n/a	Parameter string with any of the other parameters from the parameter table above*

* If multiple parameters are specified, join the parameter key-value pairs with a space, as shown in the examples below. The order of the parameter names does not matter.

Examples

The following examples set the first DVM managed load to a Triangle WaveformLoad with a starting current of 0A and a final current of 1A. The timing parameters and the optional parameter strings are different for each example.

Note: In all of the examples below, the Load column is the first column in the testplan and, therefore, begins with the special three character sequence: *?@.

Zero Time Delay Example

Since the TIME_DELAY parameter is set to zero, the triangle wave begins with a START_CURRENT value of 0 at t=0.

*?@ Load
Tri(OUTPUT:1, 0, 1, 10k, 0.70, TIME_DELAY=0)

The results of this testplan entry are shown below:

Time Delay Example

In this example, the TIME_DELAY parameter is set to 25us. Since the OFF_UNTIL_DELAY parameter is not specified, the TIME_DELAY is interpreted as a phase delay.

*?@ Load
Tri(OUTPUT:1, 0, 1, 10k, 0.70, TIME_DELAY=25u)

The results of this testplan entry are shown below:

Time Delay Example With OFF_UNTIL_DELAY=1

In this example, the TIME_DELAY parameter is set to 25us, and the OFF_UNTIL_DELAY is set to 1; therefore, for simulation times less than the TIME_DELAY parameter, the load current is 0A, which is the value of the START_CURRENT argument.

*?@ Load
Tri(OUTPUT:1, 0, 1, 10k, 0.70, TIME_DELAY=25u OFF_UNTIL_DELAY=1)

The results of this testplan entry are shown below: