DVM - Design Verification Module

Pulse Load - Single Current Pulse w/ Exponential Decay

The Pulse Load - Single Current Pulse w/ Exponential Decay subcircuit models a single exponential decaying pulse current load. This load is not used in any test objectives, but you can set a load to use this subcircuit with an Exp() call in the Load column of your testplan.

Other similar 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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Pulse Load - Single Current Pulse w/ Exponential Decay Parameters
Testplan Entry for the Single Current Pulse w/ Exponential Decay
Symmetric Rising and Falling Edge Tau Example
Asymmetric Rising and Falling Edge Tau Example

Model Name	Exponential Decay Pulse Current 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_EXP SIMPLIS_DVM_ADVANCED_LOAD_3T_EXP SIMPLIS_DVM_ADVANCED_LOAD_4T_EXP
Symbols
Schematic - 2 Terminal
Schematic - 3 Terminal
Schematic - 4 Terminal

Pulse Load - Single Current Pulse w/ Exponential Decay Parameters

The following table explains the relevant parameters for the Single Current Pulse w/ Exponential Decay Load.

Note: This load is different than the other loads in that the RISE_TIME and FALL_TIME parameters are interpreted as time constants, as opposed to literal rise and fall times. These two parameters are highlighted in red text in the table below.

Parameter Name	Default	Data Type	Range	Units	Parameter Description
FALL_TIME	50u	Real	min: 0	s	The time constant of the rising edge of the pulse in seconds
FINAL_CURRENT	750m	Real	min: 0	A	The pulse current for the load. This can be a numeric value or a symbolic value, such as a percentage of full load.
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.
PULSE_WIDTH	200u	Real	min: 0	s	The pulse width in seconds. Note: DVM considers the pulse width to be the duration of the pulse at the PULSE_CURRENT.
RISE_TIME	100u	Real	min: 0	s	The time constant of the rising edge of the pulse in seconds
START_CURRENT	0	Real	min: 0	A	The starting current for the 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 time delay before the pulse initiates

Testplan Entry for the Single Current Pulse w/ Exponential Decay

To set any managed DVM load to a Single Current Pulse w/ Exponential Decay subcircuit, place an Exp() testplan entry in the Load column.

The Exp() testplan entry has the following syntax with the arguments explained in the table below.

Exp(REF, START_CURRENT, FINAL_CURRENT, TIME_DELAY, RISING_TAU, PULSE_WIDTH, FALLING_TAU)
Exp(REF, START_CURRENT, FINAL_CURRENT, TIME_DELAY, RISING_TAU, PULSE_WIDTH, FALLING_TAU, OPTIONAL_PARAMETER_STRING)

where:

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	min: 0	The starting current for the load. This can be a numeric value or a symbolic value, such as a percentage of full load.
FINAL_CURRENT	min: 0	The pulse current for the load. This can be a numeric value or a symbolic value, such as a percentage of full load.
TIME_DELAY	min: 0	The delay before the rising edge of the Exponential Pulse. The model TIME_DELAY parameter is set to this time value.
RISING_TAU	min: 0	The time constant for the rising edge of the Exponential Pulse. The model RISE_TIME parameter is set to this time value.
PULSE_WIDTH	min: 0	The pulse width of the Exponential Pulse, including the exponential rising edge
FALLING_TAU	min: 0	The time constant for the falling edge of the Exponential Pulse. The model FALL_TIME parameter is set to this time value.
OPTIONAL_PARAMETER_STRING	n/a	Parameter string with any of the other parameters from the parameter table above*

* If more than one parameter is specified, join the parameter key-value pairs with a space, as shown in the example below. The order of the parameter names does not matter.

Symmetric Rising and Falling Edge Tau Example

The following example sets the first DVM managed load to a Single Current Pulse w/ Exponential Decay load with a starting current of 1A and a pulse current of 5A. This example shows a pulse with symmetric rising and falling edge time constants.

*?@ Load
Exp(OUTPUT:1, 1, 5, 25u, 3u, 150u, 3u)

The results of this testplan entry are shown below:

Asymmetric Rising and Falling Edge Tau Example

*?@ Load
Exp(OUTPUT:1, 1, 5, 25u, 3u, 150u, 1u)

The results of this testplan entry are shown below: