Author: Administrator

We’ve released a new video tutorial demonstrating the design and simulation of a power management circuit—specifically, the RP506K001F Step-down DC/DC Converter—using TINACloud.

TINA and TINACloud allow fast and accurate simulation and design of power management integrated circuits both offline and online.

The datasheet of this device can be found on the Nisshinbo Micro Devices Inc. website: (https://www.nisshinbo-microdevices.co.jp/en/pdf/datasheet/rp506-ea.pdf) and was used to create the SPICE model for TINA and TINACloud by DesignSoft.

This model runs not only in TINA and TINACloud, but also in major SPICE programs including PSpice, SIMetrix, LTspice, and more.

Startup Transient Simulation

Fast Average Model: In most simulators, this process is slow, but TINA and TINACloud use a built-in average model that completes the simulation in just seconds (online or offline). First load the circuit from the TINA Examples folder. To run the simulation, select Transient… from the Analysis menu, and ensure the Use switching model checkbox is not checked. Pressing Run displays the startup transient time function in a few seconds. Next, we run a cursor on the startup diagram to check that the output voltage is 1.2V.

Switching Mode Analysis: TINA and TINACloud also support the more detailed switching mode transient analysis. Thanks to advanced multicore solvers, this is still fast and provides more detailed waveforms.

Redesigning the Circuit

TINA and TINACloud’s Design Tool allows you to quickly determine component values to achieve a target output. Select Re-design this Circuit… from the Tools menu (or double-click the circuit’s text box).

In the Design Tool dialog, change the target output voltage to 3.3V and press Run. The tool instantly provides analytic results, showing the required component changes (highlighted in red) and confirming the new output voltage.

You can then run the numerical Transient simulation again to confirm the result, which will be nearly identical.

Running the Switching Model for Accuracy

You can run the most accurate simulation by checking the “Use switching model” checkbox in the Transient Analysis dialog.

This calculation takes minutes (or around 10 minutes in TINACloud, depending on traffic) and the output voltage curve is very similar to the fast average method.

Note: Switching mode simulations typically run much faster in the offline TINA program, especially on powerful, multi-threaded machines.

The only difference this method reveals is the Ripple voltage, which is not provided by the average model.

However, switching mode analysis takes considerable time, and the small ripple voltage makes zooming in quite difficult.

To solve this problem, TINA and TINA Cloud feature a fast and accurate method for the direct calculation of ripple voltages in steady state. 

Steady State Analysis and Ripple

Steady state analysis of a DC-DC power supply is the analysis of the circuit’s behavior when it has reached a steady state. This means that the output voltage is constant, except for the ripple voltage, and all the components in the circuit are operating in their steady state conditions.

Fast Ripple Calculation: Standard switching mode analysis is time-consuming, and zooming in to see the small ripple can be difficult. TINA and TINACloud feature a fast and accurate direct calculation of steady-state ripple voltages.

This method uses average models to quickly reach the steady state, then switches to switching models to determine the precise ripple voltage without needing to store initial inductor and capacitor values.

Load the specified circuit (identical to the previous one but with Global Parameter settings to define a starting time for the switching mode analysis) and run Transient Analysis. The ripple voltages and currents will appear in a diagram after a brief calculation.

Line Stepping Analysis

This determines the converter’s response to changes in the input voltage (line step disturbance).

Load the appropriate circuit and run Transient from the Analysis menu. The circuit’s response to the input voltage step appears in a few seconds.

You can also run the switching model (by checking the box) to see the full ripple voltage during the step response.

Load Step Analysis

This determines the converter’s response to changes in the load current (load step disturbance). Load the corresponding circuit (which includes a load step applied to the output current).

Select Transient from the Analysis menu and click Run. The circuit’s response will appear in a few seconds.

To see the most accurate simulation, check the “Use switching model” checkbox in the transient analysis dialog and run the simulation.

AC Analysis

The built-in average models enable fast and accurate AC analysis. Load the AC analysis circuit from the TINA Examples folder.

Select AC Analysis from the Analysis menu, then select Run AC Transfer Characteristic… The AC Bode diagram of the Loop Gain will appear.

Efficiency Analysis

TINA and TINACloud can quickly calculate efficiency as a function of the load current.

Load the specific circuit, which uses a special time-dependent load current and an Efficiency Meter. Run Analysis\Transient…

The efficiency as a function of time is calculated. Click the TR XY Plot Tab to display the Efficiency as a function of the Output (Load) current.

Conclusion

This presentation covered the analysis of all important characteristics of the
RP506K001F Step-down DC/DC Converter including:

• Startup Transient Simulation (Fast average and detailed switching modes)
• Steady State Analysis (Fast ripple voltage calculation)
• Line Stepping Analysis
• Load Step Analysis
• AC Analysis
• Efficiency Analysis

You can learn more about TINACloud here: www.tinacloud.com

You can learn more about TINA here: www.tina.com

Check out our full collection of videos here: https://www.youtube.com/@TinaDesignSuite

We’ve created a new video tutorial that explores how to quickly and accurately design and simulate power management circuits with TINACloud, this time using the LT8609 synchronous step-down switching regulator as an example. You can also use the offline TINA program for this, which we’ll illustrate in another video. The SPICE model for this device, created by DesignSoft from the official Analog Devices datasheet, is compatible with most major SPICE programs, including TINA, TINACloud, PSpice, SIMetrix, and LTspice. 

Here is a summary of the video’s content:

• Startup Transient Analysis
• Output Voltage Ripple
• Line and Load Step Analysis
• AC Analysis
• Efficiency Analysis

1. Startup Transient Analysis

A startup transient is the period a DC-DC converter takes to transition from an off state to its steady-state operating condition. Typically, simulating this can be time-consuming. However, TINA and TINACloud’s built-in average model significantly speeds up the process, taking only a few seconds. For more detailed results, the software can also perform a switching mode transient analysis, which is still quite fast thanks to its advanced multi-core solvers. Additionally, TINA and TINACloud can quickly calculate ripple voltages by combining the average and switching models.

To begin, we’ll open the “LT8609 Multiple Simulations.TSC” circuit file. This single file allows you to run all the necessary simulations to characterize the LT8609.

Running a Simulation

To perform a fast transient analysis using the average model, click the Transient Analysis Fast link or select Transient… from the Analysis menu. By default, the “Use switching model” checkbox is unchecked, which ensures the fast average model is used. After you click Run, the startup transient’s time function will appear in seconds, showing an output voltage of approximately 5V.

Redesigning the Circuit

TINA and TINACloud’s Design Tool can automatically adjust circuit parameters to meet a new output voltage target. Let’s change the output voltage from 5V to 3.3V. Select Re-design this circuit from the Tools menu or double-click the text box on the circuit. In the dialog, simply change Vout to 3.3V and click Run. The Design Tool will automatically adjust components like the Rfb2 and Rload resistors to achieve the new output, providing an immediate diagram based on these changes. You can then run a more accurate numerical simulation to confirm the new voltage.

You can also run a more accurate simulation using the switching model. Just select the Transient Analysis Accurate link or check the “Use switching model” checkbox. This calculation takes longer (about a minute) but provides more detailed waveforms, including the ripple that the average model doesn’t show.

2. Steady State and Ripple Voltage Analysis

Steady-state analysis examines a circuit’s behavior once all transients have settled. This is crucial for quickly determining ripple voltages. This method is particularly fast because it doesn’t require storing initial inductor and capacitor values. Using the same circuit file, let’s perform a transient analysis to see the ripple voltages and currents. A diagram of these values will appear after a brief calculation.

TINA and TINACloud can also quickly simulate how a DC-DC converter responds to sudden changes in either input voltage or load current. These are known as line stepping and load stepping, respectively.

3. Line Step Analysis

To see how the circuit responds to an input voltage change, click the “Line Step Analysis Fast” link. Within a few seconds, a diagram of the circuit’s response, including the full ripple voltage, will appear.

4. Load Step Analysis

Similarly, to see the circuit’s response to a load current change, click the “Load Step Analysis Fast” link. The diagram will appear almost instantly. You can also run a more accurate, switching-mode version of this analysis by checking the “Use switching model” box in the transient dialog.

5. AC Analysis

The built-in average models also enable fast and accurate AC analysis. Simply click the AC Transfer Characteristic link or select AC Analysis from the menu. This will display the AC Bode diagram of the loop gain.

6. Efficiency Analysis

Additionally, TINA and TINACloud can quickly calculate and plot efficiency as a function of time and load current. By clicking the “Efficiency Analysis Fast” link, you can get a diagram showing efficiency versus time. By switching to the TR XY Plot Tab, you can also view efficiency as a function of output or load current.

Conclusion

TINA and TINACloud provide a comprehensive and efficient platform for analyzing all the key characteristics of a synchronous step-down regulator like the LT8609. Its built-in average models and advanced solvers make it easy to quickly get accurate results for various analyses, including transient, ripple, line/load step, AC, and efficiency.

Click here to watch our video.

You can learn more about TINACloud here: www.tinacloud.com

You can learn more about TINA here: www.tina.com

Installing and Running TINA on macOS

Our tutorials (UK version, US version) show you how to install and run the TINA software on a macOS system. Follow these steps:

1. Download the installer: Download the setup file using the link provided in your email.
2. Unzip the archive: Use Finder to locate the downloaded file and unzip the archive. Some web browsers may do this automatically.
3. Install the software: Double-click the installation package to begin the installation.
4. Launch the application: After installation, go to the Applications folder in Finder and launch TINA.
5. Complete the setup: The program will download additional files and install the main modules and the AI Assistant.
6. Start TINA: Once the setup is complete, the TINA launcher will open. Double-click the TINA icon to start the program.

Registering and Authorizing TINA

To unlock the full version of the software, you’ll need to authorize it with your order number.

1. Find your order number: Copy the order number from your order confirmation email.
2. Authorize the software: In TINA, click the Authorize button.
3. Enter the order number: Paste your order number into the authorization window and click OK.

After this initial setup, you can launch the application directly from the Applications folder in Finder.

Important Note on AI Assistant:To use the AI Assistant feature, you must have the AI software Ollama installed on your system beforehand.

TINA v15 on macOS: Practical Examples

In the following sections, we will use practical examples to demonstrate how to use TINA v15 on macOS, covering:

• Transient Analysis

• PCB Designer

• Using TINA’s AI Assistant

Click here (UK version, US version) to watch our videos.

You can learn more about TINA here: www.tina.com

You can learn more about TINACloud here: www.tinacloud.com

The rest of this blog is in Hungarian language. You can find the English version here

1. Félösszeadó kapcsolási rajzának létrehozása

Az alábbiakban egy félösszeadó áramkör létrehozását és szimulációját mutatjuk be a TINA program segítségével.

Ez az oktatóvideó mind az Európában használatos IEC mind pedig az amerikai ANSI szimbólumokkal is elkészült, melyek az alábbi linkekre kattintva érhetők el:

Oktatóvideó: IEC

Oktatóvideó: ANSI

Megjegyezzük hogy logikai komponensekre az amerikai ANSI szimbólumokat Európában és Magyarországon is sokan kedvelik.

Természetesen a TINA és TINACloud programokban bármikor átválthatunk a két szimbólumkészlet bármelyikére.

Először létrehozzuk a félösszeadó kapcsolási rajzát. A Sum (összeg) előállításához KIZÁRÓ-VAGY kaput, míg az Carry (átvitel) előállításához ÉS kaput használunk. Bemeneteket High-Low alternatív kapcsolók segítségével állítjuk elő.

2. Félösszeadó áramkör tesztelése DIG Interaktív gomb segítségével

Miután létrehozzuk a Félösszeadó kapcsolási rajzát, teszteljük áramkörünket a DIG Interaktív Digitális gomb megnyomásával.

Abban az esetben, ha a programban más interaktív mód lenne beállítva, akkor kattintsunk az Interaktív menüpontra, és a legördülő listából válasszuk ki a Digitális opciót.

Az interaktív módot úgy is kiválaszthatjuk, ha a  DIG interaktív ikon mellett található kis nyílra kattintunk, majd a  legördülő listából választjuk ki a Digitális opciót.

3. Alternatív kapcsolók helyettesítése egy-egy digitális jelgenerátorral

Ezt követően töröljük mindkét alternatív kapcsolót, és egy-egy digitális jelgenerátorral helyettesítjük azokat.

Az összes jelkombináció generálásához 1s időtartamon beállítjuk először a PS1 Digitális Jelgenerátor értékét magas (H) logikai szintre 0.2s és 0.6s között, majd a PS2 Digitális Jelgenerátor értékét 0.4s és 0.8s közötti magas logikai szintre.

Ezek után hozzáadunk még az áramkörünk Bemenetéhez két Kimenetet, hogy a szimulációs eredményeket bemutató diagramunkon a bemeneti jelek is láthatóvá váljanak.

4. Újonnan hozzáadott Kimenetek átnevezése, és sorrendiség meghatározása a diagramban

Átnevezzük az újonnan hozzáadott kimeneteket A-ra és B-re. Még
mielőtt lefuttatnánk a diagramot, meghatározzuk a sorrendiséget.

Ehhez A-t átnevezzük. A:1-re, a B kimenetet B:2-re és a Sum-ot Sum:3-ra.

Ezekkel a beállításokkal tehát meghatározhatjuk a jelek sorrendjét a diagramon A lesz legfelül, ezt követi B, Sum és Carry.

5. Az áramkör tesztelése Digitális Analízis segítségével

Oktatóvideónk végén teszteljük áramkörünket Digitális Analízis segítségével.

A kapott diagramban minden jel külön és a megadott sorrenben szerepel.

Nézze meg videóinkat, melyek az alábbi linkekre kattintva érhetők el.
IEC
ANSI 

A következő weboldalakon érhet el minket:

www.tina.com

www.tinacloud.com

Youtube elérhetőségünk: https://www.youtube.com/user/TinaDesignSuite