I solved for current, you solved for voltage. Tomorrow I am going to do the definite quadratic formula, well the half of it that gives the lower root. Then we will have my definite current formula and your definite voltage formula. Hopefully they will gracefully merge around the power coefficient and a good formula for line drop when using SMT regulators and fixed loads will be done for time and all of eternity.
From: Forrest Christian (List Account) Sent: Friday, March 10, 2017 7:55 PM To: af Subject: Re: [AFMUG] Raw Data Yeah, no kidding. I think the difference between our formulas might be that you're looking for the Vdrop and I'm looking for Vload... On Fri, Mar 10, 2017 at 8:46 PM, Chuck McCown <[email protected]> wrote: I think you would agree, this is not as simple as it first appears.... From: Forrest Christian (List Account) Sent: Friday, March 10, 2017 7:43 PM To: af Subject: Re: [AFMUG] Raw Data Calculated values, from 16 to 24, using 6.24 as the power, 8 ohms, and 16 through 24 volts in. This is using my formula: 11.75233261 13.22546294 14.57494395 15.85059052 17.07672241 18.26723889 19.43089556 20.57358804 21.69948452 (SQRT(Vin*Vin-4*Pload*Rcable)+Vin)/2 On Fri, Mar 10, 2017 at 6:45 PM, <[email protected]> wrote: This is an SM with and without an 8 ohm series resistance. This data was after boot up. I came down from 24 volts when testing with the 8 ohm because it will not boot with the resistor until you get up to about 18 volts due to high current during booting. Voltage Current Power 8 ohm I 8 Ohm Load V 11 0.56 6.16 12 0.52 6.24 13 0.48 6.24 14 0.45 6.3 15 0.4 6 16 0.39 6.24 0.56 11.52 17 0.35 5.95 0.47 13.24 18 0.34 6.12 0.43 14.56 19 0.32 6.08 0.38 15.96 20 0.3 6 0.35 17.2 21 0.28 5.88 0.33 18.36 22 0.28 6.16 0.31 19.52 23 0.27 6.21 0.3 20.6 24 0.26 6.24 0.28 21.76 Am late for a company dinner celebrating the 10 anniversary of one of our employees. So will analyze tomorrow to see if it matches my quadratic equation. -- Forrest Christian CEO, PacketFlux Technologies, Inc. Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 [email protected] | http://www.packetflux.com -- Forrest Christian CEO, PacketFlux Technologies, Inc. Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602 [email protected] | http://www.packetflux.com
