NIPPON CHEMI-CON CORPORATION

Model data selection procedure

This article explains the procedures using a sample semiconductor circuit (LTC7800) as an example.
Even if using a different semiconductor or a circuit you created, you can use the same procedure to switch to the applicable capacitor.

1. Refreshing LTspice data
   Please refresh the LTspice component data prior to creating the circuit. You can refresh data by selecting [Sync Release] under [Tools] in the menu bar.
   Our models are not included in the old component data.
2. Creating a new circuit
   Here, we are using a sample semiconductor circuit (LTC7800).
   First, open the [Create New Circuit] window.
   Click on the area circled in red in Figure 1.
   

   Fig.1 Circuit creation window in LTspice
   

3. Selecting the sample circuit
   Click the area circled red from the parts at the top of the window in Figure 2. You can select Component from this icon.
   In the red square part of the window that opens, enter [LTC7800], which is the name of the semiconductor we will use as an example.
   If a matching part is found, it will be selected automatically from the list at the bottom.
   Make sure that [LTC7800] is selected, then click [Open this macromodel's example circuit] to load the circuit data.
   

   Fig.2 Sample circuit selection window
   

4. Replacing the component for evaluation
   Replace the component arranged on the sample circuit.
   Here, we will replace the output smoothing capacitor with a hybrid aluminum electrolytic capacitor.
   
   First, click the scissors icon in the red circle in the area labeled STEP1 in Figure 3, and then click on the component you want to delete.
   Here, we indicate [Delete] on the component to be deleted.
   
   Then, click the Component icon in the red circle in the area labeled STEP2 in Figure 3.
   

   Fig.3 Deleting a circuit component and about the Component icon
   

5. Selecting a Nippon Chemi-Con product
   Clicking the Component icon shown in Figure 3 above will open the window shown in Figure 4 below.
   First, click on the item indicated with [Contrib], then click on the item indicated as [CHEMI-CON].
   

   

   Fig.4 Product data storage location
   

6. Selecting an item to use
   Selecting [CHEMI-CON] in Figure 4 above displays options such as [Capacitors] and [Inductors].
   Here, select [Capacitors] and then select [Alcap-PolymerHybrid-SMD], which contains data on surface mount-type hybrid aluminum electrolytic capacitors. This displays a list of included products.
   The product categories included in each folder are shown in the table.

   Product Type	Folder
   Conductive Polymer Aluminum Solid Capacitors - SMD	Alcap-PolymerSolid-SMD
   Conductive Polymer Aluminum Solid Capacitors - Radial Lead Type	Alcap-PolymerSolid-THD
   Conductive Polymer Hybrid Aluminum Electrolytic Capacitors - SMD	Alcap-PolymerHybrid-SMD
   Conductive Polymer Hybrid Aluminum Electrolytic Capacitors - Radial Lead Type	Alcap-PolymerHybrid-THD
   Aluminum Electrolytic Capacitors - SMD	Alcap-SMD
   Aluminum Electrolytic Capacitors - Radial Lead Type	Alcap-THD

   In this example, select [HHXC250ARA101MF80G] and click the [OK] button. (Figure 5)
   

   Fig.5 Selecting an item part number
   

7. Arranging on the circuit
   You are now holding [HHXC250ARA101MF80G]. Place it in the section where you deleted the output smoothing capacitor earlier. It will be mounted when you click on the corresponding part marked [Click to Insert] as shown in Figure 6.
   

   Fig.6 Component placement
   

8. Running the simulation
   You can now run the simulation. Click [Run] at the top to run the simulation.

How to simulate characteristics by ambient temperature

Characteristics of aluminum electrolytic capacitors that use an electrolyte fluid, such as ESR and capacitance, change significantly depending on the ambient temperature.
In the SPICE model data distributed by our Company, we provide model data by temperature for products that use an electrolyte fluid.^*1
*1 Excludes certain items

1. Temperature data selection window
   Align the pointer with the target electrolytic capacitor and right-click.
   In Figure 7, this is indicated in red as STEP1.
   

   Fig.7 Temperature data switch window
   

2. Selecting data
   In the displayed window (Figure 7), click the Value area of the item labeled [Attribute "SpiceModel"] to display selectable temperature data. (Step 2 is written in red.)
   ● Category minimum temperature
   ● +20℃
   ● Category maximum temperature
   Typically, products are set with these three parameters.

Simulation results by aluminum electrolytic capacitor type

Here, we will compare hybrid aluminum electrolytic capacitors and aluminum electrolytic capacitors that use an electrolyte fluid.
Although the products have the same capacitance, they have different ESR values, and it can be seen that the output ripple voltages are significantly different.

Simulation results when switching temperature data

Next is the result of switching temperature data using an aluminum electrolytic capacitor that uses an electrolyte fluid.
Under low temperature (-55℃) conditions, ESR increases significantly and capacitance decreases. As a result, it can be seen that the output ripple voltage has increased significantly.

Caution

SPICE simulates the circuit operations mathematically but operations may differ from the actual prototype. As such, please use the tool as a reference only.
Our Company shall bear no liability whatsoever for any malfunctions that occur.