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                  | N                  |
|---:|:----|:------------------------------------------------------------|:-------------------------------------------------------------------------------------|:-------------------|:----|:---------------------|:------|:----|:----|:-------------------|:--------------|:----|:-------------------|:-------------------|
| 10 |     | Cout                                                        | Load Capacitance                                                                     | 1000               | µF  | 0.1                  |       |     |     |                    |               |     |                    |                    |
| 11 |     | TA (max)                                                    | Maximum Ambient Temperature                                                          | TA = 25C           | °C  |                      |       |     |     |                    |               |     |                    |                    |
| 12 |     | RLstart                                                     | Load during start-up (Assumed to be resistive)                                       | 1000               | Ω   |                      |       |     |     |                    |               |     |                    |                    |
| 13 |     | Imax                                                        | Maximum continuous load current                                                      | 5                  | A   |                      |       |     |     |                    |               |     |                    |                    |
| 14 |     | IINRUSH_permissible                                         | Permissible inrush current from power supply or system for charging Cout on Start-up | 0.5                | A   |                      |       |     |     |                    |               |     |                    |                    |
| 15 |     | ILimit                                                      | Current Limit, 5% higher than [Imax + IINRUSH_permissible ]                          | 5.775              | A   |                      |       |     |     |                    |               |     |                    |                    |
| 16 |     |                                                             |                                                                                      |                    |     |                      |       |     |     |                    |               |     |                    |                    |
| 17 |     | UVLO, OVP Calculations                                      | OVP Calculations are only for TPS26630,TPS26631 and TPS16630.                        |                    |     |                      |       |     |     |                    |               |     |                    |                    |
| 18 |     | R3_sel                                                      | Select a value of resistor between OVP and GND pins [1k to 249k]                     | 34                 | kΩ  | 0.01                 |       |     |     |                    |               |     | 340.0              | 340.0              |
| 19 |     | R2_cal                                                      | Calculated value of Resistor between UVLO and OVP pins                               | 28.33333333333334  | kΩ  |                      |       |     |     | 16.885454545454543 | Power Fail    |     | 283.33333333333337 | 283.33333333333337 |
|    |     |                                                             |                                                                                      |                    |     |                      |       |     |     |                    | (VIN Falling) |     |                    |                    |
| 20 |     | R1_cal                                                      | Verify value of Resistor at IN_SYS and UVLO pins [> 300k]                            | [Target Cell]      | kΩ  |                      |       |     |     | 17.774162679425835 | UVLO          |     | 872.6666666666666  | 872.6666666666666  |
|    |     |                                                             |                                                                                      |                    |     |                      |       |     |     |                    | (VIN Rising)  |     |                    |                    |
| 21 |     | SELECT THE CLOSEST POSSIBLE RESISTANCE VALUE FOR R1, R2, R3 |                                                                                      |                    |     |                      |       |     |     | 32.77764705882353  | OVP           |     |                    |                    |
|    |     |                                                             |                                                                                      |                    |     |                      |       |     |     |                    | (VIN Rising)  |     |                    |                    |
| 22 |     | R3_sel                                                      | Selected closest possible value for R3 resistor                                      | 34                 | kΩ  | 0.01                 | 34.0  |     |     |                    |               |     | 340.0              | 10.0               |
| 23 |     | R2_sel                                                      | Selected closest possible value for R2 resistor                                      | 28.7               | kΩ  | 0.01                 | 28.7  |     |     |                    |               |     | 287.0              | 10.0               |
| 24 |     | R1_sel                                                      | Selected closest possible value for R1 resistor                                      | 866                | kΩ  | 0.01                 | 866.0 |     |     |                    |               |     | 866.0              | 1.0                |
| 25 |     | UV_Final                                                    | Undervoltage Lockout Set point                                                       | 17.774162679425835 | V   | 0.026457513110645908 |       |     |     |                    |               |     |                    |                    |
| 26 |     | OV_Final                                                    | Over Voltage Cut-Off Set point                                                       | 32.77764705882353  | V   | 0.026457513110645908 |       |     |     |                    |               |     |                    |                    |
| 27 |     | Power Fail Detection                                        | Power Fail Detection Set Point                                                       | 16.885454545454543 | V   | 0.026457513110645908 |       |     |     |                    |               |     |                    |                    |
| 28 |     | I_R123                                                      | Verify minimum Current in R1, R2, R3 Branch at Input voltage of Uvset [> 2uA]        | 19.381931732529342 | uA  |                      |       |     |     |                    |               |     |                    |                    |
| 29 |     |                                                             |                                                                                      |                    |     |                      |       |     |     |                    |               |     |                    |                    |
| 30 |     | Current Limit Calculations                                  |                                                                                      |                    |     |                      |       |     |     |                    |               |     |                    |                    |



min_row: 10
max_row: 30
min_col: 1
max_col: 14
target_cell_row_idx: 20
target_cell_col_idx: 4
target_cell_value: 872.6666666666666
formula: =D18*(OVset/OVPref)*(1-(UVLOref/UVset))