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. In DVM, 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

In this topic:

DVM Information

Power Supply (Non-DVM) Information

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

Power Supply Loads > Power Supply Load ( DC Current, Pulse, Bode, Zout... )

Symbol Library

SIMPLIS_DVM_ADVANCED.sxslb

power_supply_source_and_loads.sxslb

Model File

SIMPLIS_DVM_ADVANCED.lb

power_supply_source_and_loads.lb

Subcircuit Name

SIMPLIS_DVM_ADVANCED_LOAD_2T_EXP
SIMPLIS_DVM_ADVANCED_LOAD_3T_EXP
SIMPLIS_DVM_ADVANCED_LOAD_4T_EXP

POWER_SUPPLY_LOAD_EXP

Symbols

Schematic - 2 Terminal

Note: Power Supply probes will not have the "DVM" prefix.

Schematic - 3 Terminal

Note: Power Supply probes will not have the "DVM" prefix.

Schematic - 4 Terminal

Note: Power Supply probes will not have the "DVM" prefix.

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 falling 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. 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

DVM 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 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, for example:

parameter_name1=parameter_value1 parameter_name2=parameter_value2

The order of the parameter key-value pairs does not matter.

Symmetric Rising and Falling Edge Tau DVM 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.

Note: In the following testplans, the Load column is prefaced with the characters *?@ because it is the first column in the testplan.

*?@ 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 DVM Example

Note: In the following testplans, the Load column is prefaced with the characters *?@ because it is the first column in the testplan.

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

The results of this testplan entry are shown below:

Converting between DVM and Power Supply Loads

To change a Power Supply load to a DVM load, right click the symbol to bring up the context menu, and select the menu option: Upgrade to DVM Source/Load

To change a DVM load to a Power Supply load, right click the symbol to bring up the context menu, and select the menu option: Downgrade to SIMetrix/SIMPLIS Source/Load