|Nov 02, 2007, 10:06 PM|
BEC operation with input volts below out put volts.
This question came up in the Batteries and Chargers Forum.
As I read / understand the pdf spec. sheets it appears that the regulators DE uses requires input voltage to be output + 1.3V.
Question is what happens if a 6V BEC is being used and input drops to below 6 volts?
Does it just pass the available voltage?
Supply available voltage minus X?
Shuts down and passes zero volts?
With the Spektrum receivers being prong to shutting down at just below 4 volts and the more common usage of A123 and other LiIon high current cells which can have severe voltage drops under heavy loads inquiring minds want / need to know.
|Nov 05, 2007, 11:49 AM|
Joined Mar 2005
The output voltage will become the input voltage minus the dropout voltage. There isn't a sudden shutdown - the voltage will just start to drop as the input drops. The dropout voltage will vary depending on the amount of current you are pulling, but 1.3V is fairly common. To ensure a 6.0V output with a good safety margin we recommend you keep the input voltage above 8.0V (hence why ParkBEC 6V is rated for a minimum of 3s lithium).
|Category||Thread||Thread Starter||Forum||Replies||Last Post|
|Question||CC T-Bird 54 + Sport BEC input volts||new2rc||Castle Creations||2||Aug 09, 2007 02:55 PM|
|How exactly do Amps go up with more volts or larger prop||ElSeeker||Power Systems||134||Nov 15, 2005 12:59 PM|
|Question about amps with same volts.||mohillbilly||Batteries and Chargers||4||Aug 06, 2005 12:58 PM|
|why do you have to use less servo's with more volts?||jeff262||Power Systems||3||Jan 03, 2004 09:24 PM|
|BEC problems with 11 cells i/o 10||ChrisP||Power Systems||8||May 22, 2001 01:46 AM|