Task: Formula-prediction-context (source dataset: ti-random)

You are given an table region extracted from a real Excel spreadsheet, which is centered around a cell called "Target Cell" (labeled as "[Target Cell]" shown in the table below). The table region below includes up to 10 rows above/below the Target Cell, and 10 columns to the left/right of the Target Cell. 

Your task is to analyze the table context surrounding the Target Cell, and predict the most likely Excel formula that should go in the Target Cell. If multiple formulas are possible, choose the most reasonable or commonly used based on context.

1. Please follow the standard formula syntax in Excel, e.g. always begins with an equal sign (=).
2. Base your predicted formula on the surrounding table context, e.g., column headers, annotations, and data values in nearby cells.
3. No explanation — just output the formula itself in a JSON format: {"formula": "your_formula_here"}.

Input Excel Snippet in Markdown format:
|    | A   | B                                                                                                                                                                                                                                                                                                                      | C    | D                      | E                              | F   | G   | H   | I   | J   | K   | L   | M   |
|---:|:----|:-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:-----|:-----------------------|:-------------------------------|:----|:----|:----|:----|:----|:----|:----|:----|
|  7 |     |                                                                                                                                                                                                                                                                                                                        |      |                        |                                |     |     |     |     |     |     |     |     |
|  8 |     | UCC28740 CONSTANT-VOLTAGE, CONSTANT-CURRENT FLYBACK DESIGN CALCULATOR                                                                                                                                                                                                                                                  |      |                        |                                |     |     |     |     |     |     |     |     |
|  9 |     | CLEAR ALL USER INPUT CELLS BEFORE STARTING A NEW DESIGN                                                                                                                                                                                                                                                                |      |                        |                                |     |     |     |     |     |     |     |     |
| 10 |     | ALL GREEN CELLS ARE USER INPUTS                                                                                                                                                                                                                                                                                        |      |                        |                                |     |     |     |     |     |     |     |     |
| 11 |     | WHERE APPLICABLE, A RECOMMENDED VALUE IS GIVEN THAT WILL BE THE BEST CHOICE TO MEET THE GIVEN SPECIFICATION.  IT IS IN THE BEST INTEREST OF THE USER TO USE A VALUE AS CLOSE AS POSSIBLE TO THE SUGGESTED RECOMMENDED VALUE.  FOR ACCURATE RESULTS, THE USER MUST ENTER THE ACTUAL VALUE USED IN THE APPROPRIATE CELL. |      |                        |                                |     |     |     |     |     |     |     |     |
| 12 |     | DESIGN REQUIREMENTS                                                                                                                                                                                                                                                                                                    |      |                        |                                |     |     |     |     |     |     |     |     |
| 13 |     |                                                                                                                                                                                                                                                                                                                        |      |                        |                                |     |     |     |     |     |     |     |     |
| 14 |     |                                                                                                                                                                                                                                                                                                                        |      |                        |                                |     |     |     |     |     |     |     |     |
| 15 |     | INPUT SPECIFICATIONS                                                                                                                                                                                                                                                                                                   |      |                        |                                |     |     |     |     |     |     |     |     |
| 16 |     | Input Voltage Type, AC or DC:                                                                                                                                                                                                                                                                                          | AC   | Choose either AC or DC |                                |     |     |     |     |     |     |     |     |
| 17 |     | Minimum Input Voltage, VINPUTmin =                                                                                                                                                                                                                                                                                     | 85   | [Target Cell]          |                                |     |     |     |     |     |     |     |     |
| 18 |     | Maximum Input Voltage, VINPUTmax =                                                                                                                                                                                                                                                                                     | 265  | VAC                    |                                |     |     |     |     |     |     |     |     |
| 19 |     | Nominal Input Voltage, VINPUTnom =                                                                                                                                                                                                                                                                                     | 220  | VAC                    |                                |     |     |     |     |     |     |     |     |
| 20 |     | Minimum Line Frequency, fLINEmin =                                                                                                                                                                                                                                                                                     | 47   | Hz                     | For universal line enter 47 Hz |     |     |     |     |     |     |     |     |
| 21 |     | Minimum Input Voltage for Start-Up, VINPUTrun =                                                                                                                                                                                                                                                                        | 85   | VAC                    |                                |     |     |     |     |     |     |     |     |
| 22 |     |                                                                                                                                                                                                                                                                                                                        |      |                        |                                |     |     |     |     |     |     |     |     |
| 23 |     | OUTPUT SPECIFICATIONS                                                                                                                                                                                                                                                                                                  |      |                        |                                |     |     |     |     |     |     |     |     |
| 24 |     | Regulated Output Voltage, Constant Voltage Mode, VOUT_CV =                                                                                                                                                                                                                                                             | 3.3  | VDC                    |                                |     |     |     |     |     |     |     |     |
| 25 |     | Full Load Rated Output Current, IOUT =                                                                                                                                                                                                                                                                                 | 3.3  | A                      |                                |     |     |     |     |     |     |     |     |
| 26 |     | Target Constant Current Mode Output Load Threshold, IOCC =                                                                                                                                                                                                                                                             | 3.5  | A                      |                                |     |     |     |     |     |     |     |     |
| 27 |     | Target Minimum Output Voltage During Constant Current Regulation, VOUT_CC =                                                                                                                                                                                                                                            | 3.15 | VDC                    |                                |     |     |     |     |     |     |     |     |



min_row: 7
max_row: 27
min_col: 1
max_col: 13
target_cell_row_idx: 17
target_cell_col_idx: 4
target_cell_value: VAC
formula: =IF(Vin_type="AC","VAC","VDC")