Fairchild TinyCalc service manual

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TinyCalc™ User’s Guide (Excel® 07 Version)

Introduction

TinyCalc™ is a Microsoft® Excel®-based calculator created to simplify the design of TinyBuck™-based regulators. TinyBuck™ products are integrated synchronous buck regulators with one high-side and one low-side MOSFET and a controller / driver integrated in one 5x6mm molded leadless package (MLP).

The last digit in the part number signifies the current rating of the product. This calculator covers designs with FAN2103, FAN2106, FAN2108, FAN2110, FAN21SV04, and FAN21SV06 regulators. Regulators with SV in the part numbers have a built-in 5V regulator.

This document describes how to configure Excel 07 so this calculator can work without errors. This guide explains how to use the TinyCalc™ calculator to choose external components for designs once the input and output conditions are provided.

Video Instructions

If you would prefer to watch an online video, click on the following link: “TinyCalc Setup Video”

Before Opening TinyCalc™

Add-in installation and Macro security selections must be set up before opening TinyCalc™.

Check for Installed Add-in(s)

1. Open a new (blank) Excel

worksheet.

2. Click on the Windows icon

at the top left.

3. This opens up a pop-up

window (at right).

4. Click on the Excel Options

button at the bottom of this dialog box which opens the Excel Options window.

5. Click on the Add-Ins tab on

the left side of Excel Options window. This lists all the Add-ins available.

6. Click on the drop-down

window next to Manage: at the left bottom, select Excel Add-ins, and then click on the Go... button next to it.

7. This opens the Add-Ins

dialog box.

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8. Select Analysis Toolpak and Analysis Toolpak – VBA. Disregard any

other add-ins.

9. Click OK and return to the new worksheet.

Note: If these two add-ins aren’t available in the Excel installation, it is

necessary to install the complete version of Excel.

Set Macro Security to Medium

TinyCalc™ works by embedding calculations as macros. Excel must be able to run these macros for the application to function, but macros are considered a security risk. Therefore, to run the macros, it is necessary to set your security to medium (vs. high). With the new (blank) worksheet open, follow these steps to set the macro security:

1.

Click the Windows icon located at the top left of the screen.

2.

Click on the Excel Options button at the bottom right of the window.

3.

Select Trust Center in the left side of Excel options window

4.

Click on the Trust Center Settings... button at the right.

5.

Select the Macro Settings in the left pane of the Trust Center window.

6.

Select the option: Enable all macros (which opens all files with macros) OR

Disable all macros with notification

(which prompts each time a file with macros is opened).

7.

Click OK and click OK again on the last window open. This returns to the open blank sheet.

8.

Close the blank worksheet.

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Working with TinyCalc™

1. Close any open Excel workbooks or worksheets.

2. Open the TinyCalc™ file delivered with this user guide. (The file name might change based on the revision – go to the

website to get the latest version of the calculator.)

3. If macros are enabled, the file opens without any warning.

Skip to step 7.

4. If macros are disabled with notification, the file opens with a

security warning.

5. Click on the Options… button.

6. Select the option Trust all documents from this publisher and click OK. This closes the security alert and allows the

TinyCalc™ file to open.

7. When prompted to accept Fairchild’s terms and

conditions to use TinyCalc™, click the I Agree button.

8. In the Select Regular dialog box, select the regulator for your circuit design from the drop-down list and click OK.

9. Click OK to confirm the selection.

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TinyCalc™ User Interface

The figure below is the “Front Page.” The numbers from 1 to 7 indicate the order of the steps involved in going through a design. Once you are familiar with this calculator, you can skip to steps as needed by clicking on the appropriate button.

Clicking on the Welcome / Help / Design Procedure button opens the following dialog box. It is intended to provide firsttime users a brief description of the steps. It is recommended that you read this page when you use the calculator for the first time. Click OK to return to the Front Page.

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STEP 1 – Design Inputs

1. Click on the Design Inputs / START HERE button.

2. In the Input Parameters dialog box, enter the numbers for each of the design input variables.

Notes:

a. Press the tab key to move to the next field.

b. If you enter a unsuitable value, an error message appears providing the

appropriate range for the parameter. The control remains in the window until an acceptable value is entered. The acceptable range is based on the specifications of the regulator selected.

3. After all the values are entered, click OK. If all the variables are accepted as valid inputs, the calculator closes and returns to the Front page.

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STEP 2 – Output L&C Section

1. Click on the Output L&C Section button to open the Select the Right Inductor and Capacitor dialog box. The top two boxes show suggested inductor and capacitor values.

2. Enter data for the inductor and capacitors (with combinations) for your design.

Note: If either of the ceramic OR electrolytic capacitors (bulk) is used alone, put zero (0) for parameters of the

capacitor not used. Use only numbers in these boxes.

3. After all the values are entered, press OK and return to the Front page.

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STEP 3 – Bode Plots / Compensation

1. Click on the Bode Plots / Compensation button.

2. This opens a worksheet where you can select the compensation components required to close the control loop and ensure stable operation of the converter. Before you are given control on this sheet the first time, a message appears informing you that changes affect the bill of materials. This is for your information only.

3. Press OK to close this window and begin using the worksheet.

There are five columns in this worksheet, with rows 2 and 3 containing numbers. The second column is a set of recommended values corresponding to the component designators in the pictures below the two rows. The third column is where you can modify the numbers and see how the component values change phase margin.

There are buttons to the right to help you navigate from one sheet to other.

Go to Front Page returns you to the Front Page.

Go to Schematic accesses the typical application schematic for the part (same as step 4 from the Front Page).

Go to Bode Plots accesses graphs based on your component selections and values (see next page).

Print this Page sends the current sheet to the printer of your choice.

Copy Data & Pictures saves this data to the Windows clipboard in a picture format for you to paste into any other

Microsoft document.

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The Bode Plots page displays plots for full load at minimum and maximum input voltage conditions.

There are text boxes that display the crossover frequency (bandwidth) and the phase margin for this design. Typically, it is a good idea to have greater than 60° of phase margin and bandwidth less than one fifth (1/5) of the switching frequency. Each time you return to this page, the new plot is based on the components selected.

There are buttons along the top to help you navigate from one sheet to other.

Go to Front Page returns you to the Front Page.

Go to Schematic accesses the typical application schematic for the part (same as step 4 from the Front Page).

Go to Compensation allows you to change or adjust any of the component values.

Print Bode Plots sends the current sheet to the printer of your choice.

Copy Bode Plots saves the plot to the Windows clipboard in a picture format for you to paste into any other

Microsoft document.

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STEP 4 – Schematics & Layout Recommendations

Click on Schematics & Layout Recommendations button. The typical application diagram that appears changes based on the controller chosen.

There are buttons at the right to help you navigate from one sheet to other.

Go to Front Page returns you to the Front Page.

Print Schematic sends the current diagram to the printer of your choice. All the component designators in the Bill of

Material sheet (Step 6) refer to this schematic.

Bode Plots / Compensation allows you to change or adjust any of the component values.

Layout Recommendations accesses general recommendation on how to layout switching regulators and provides a

copy of the evaluation board layout.

Copy Schematic saves the diagram to the Windows clipboard in a picture format for you to paste into any other Microsoft document.

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STEP 5 –Loss Estimate

Click on the Loss Estimate button. The calculator estimates efficiency and losses at minimum and maximum input voltage conditions with the load current as a variable at room temperature in chart form.

There are buttons at the right to help you navigate from one sheet to other.

Go to Front Page returns you to the Front Page.

Go to Schematic accesses the typical application schematic for the part (same as step 4 from the Front Page).

Print Eff & Losses sends the current charts to the printer of your choice.

Copy Eff & Losses saves the charts to the Windows clipboard in a picture format for you to paste into any other

Microsoft document.

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STEP 6 – Bill of Materials

1. Click on Bill of Materials button.

2. A dialog box that appears to make sure that you don’t jump into this section without entering right values for the inductor and output capacitor. Press OK to proceed to the Bill of Materials worksheet or Cancel to return to the Front Page.

This sheet provides all the component values needed to build the design according to your selections and entered values. This sheet includes any changes made in the “compensation” components as well as the inductor and output capacitors. There are a few component manufacturers links for capacitors and inductors to help you find the right parts.

There are buttons along the top to help you navigate from one sheet to other.

Go to Schematic accesses the typical application schematic for the part (same as step 4 from the Front Page).

Print BOM sends the current worksheet to the printer of your choice.

Go to Front Page returns you to the Front Page.

Copy BOM saves the worksheet view to the Windows clipboard in a picture format for you to paste into any other

Microsoft document.

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STEP 7 – Print All Design Documents

1. Click on the Print All Design Documents button.

2. A dialog box that appears to make sure that you don’t jump into this section without entering right values for the inductor and output capacitor. Press OK to proceed to print preview or Cancel to return to the Front Page.

This enables you to print all the design documents once. This feature is helpful if you have this design saved and you want to print the documents at all later time. This accesses the standard MSExcel print preview functionality.

3. Click Print… to select the printer and the number of copies to print.

After printing, the control returns to the Front Page.

Select Another Regulator

1. Click the Select Another Regulator Button to repeat the process with a new regulator (see STEP 1).

Design Complete!

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Related Datasheets

FAN2103 — TinyBuck™ 3A, 24V Input Integrated Synchronous Buck Regulator

FAN2106 — TinyBuck™ 6A, 24V Input Integrated Synchronous Buck Regulator

FAN2108 — TinyBuck™ 3-24V Input, 8A, High-Efficiency, Integrated Synchronous Buck Regulator

FAN2110 — TinyBuck™ 3-24V Input, 10A, High-Efficiency, Integrated Synchronous Buck Regulator

FAN21SV04 — TinyBuck™ 4A, 24V Single-Input Integrated Synchronous Buck Regulator

FAN21SV06 — TinyBuck™ 6A, 24V Input, Single Supply, Integrated Synchronous Buck Regulator

TinyCalc™ Calculator for the Design of TinyBuck™-Based Regulators

Notes:

Every effort has been made to ensure that TinyCalc is accurate and reliable; however, if a command throws a “Run-Time Error,” closing and opening it resolves the issue.

Excel users who have been using Excel 97 through Excel 2003 who upgrade to Excel 2007 or 2010 may find the new ribbon system confusing. If this is the case, Microsoft® has a released a free workbook that maps Excel 97-2003 commands to the ribbon: Excel Ribbon Mapping Workbook that may be useful.

DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES W ITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user.

2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

Fairchild TinyCalc service manual

Specifications and Main Features

Frequently Asked Questions

User Manual