Available Fault Current Calculator Excel Spreadsheet 
The Available Fault Current, prospective shortcircuit current (PSCC), or shortcircuit making current is the highest electric current which can exist in a particular electrical system under shortcircuit conditions. 

Arc Flash Calculator per NFPA 70E Calculator Excel Spreadsheet 
This Excel file combines arc flash equations from a proposal to NFPA 70E2003 with simplified equations to calculate available fault current. This tool uses methods that have been shown to result in conservative estimates of fault current, which should result in conservative estimates of arc incident energy if appropriate arc fault clearing times are used . An IEEE 1584 equation is used to calculate arcing fault current. 

NCP108x Flyback CCM Design Calculator Excel Spreadsheet 
This spreadsheet calculates both system and component data for use with the NCP108x in a continuous conduction mode, isolated and nonisolated flyback topology. Calculations are based on system specifications provided by the user. 

NCP1611 Generator Frequency Calculator Excel Spreadsheet 
The NCP1611 is designed to drive PFC boost stages in socalled Current Controlled Frequency Foldback (CCFF). In this mode, the circuit classically operates in Critical conduction Mode (CrM) when the inductor current exceeds a programmable value. 

Voltage Divider for 5% Resistors Calculator Excel Spreadsheet 
This sheet shows the outputs of a voltage divider for standard 5% valued resistors. Vin (currently set at 10V) can be changed to any desired input voltage and the sheet recalculated. Read the values of R1 down the left hand column, and the values of R2 across the top row. 

