Dear friends,
I'm learning to make a hybrid power supply based on LM2577 and LM7815/7915.
I have a spare 9V-0-9V 2.7A toroidal power transformer that I can use for this project, and my intention with the LM2577 is obviously to step up the rectified unregulated DC voltage from 10V to 18V.
Based on the datasheet, the formula is:
VOut = 1.23 x (1 - (R1/R2))
Therefore, if my R2 is 2K, then R1 is:
R1 = ((18 / 1.23) - 1) X 2K = 27.2K
Am I correct?
I also understand that this step up process will lower the total supply current from 2.7A to 1.35A, which is ok, because my device draws a max current of 730mA.
I have also read the application note from LT written by the late Mr. Williams, about adding a ferrite bead before and after the linear regulators to help minimize the switching noise.
So before I proceed to make the board, I have just one question to ask.
Is it safe to use 1A inductors (eg: Murata 13R104C) and 1A Schottky diodes (eg: 1N5819)?
Thank you for the valuable assistance.
Regards,
Brian
I'm learning to make a hybrid power supply based on LM2577 and LM7815/7915.
I have a spare 9V-0-9V 2.7A toroidal power transformer that I can use for this project, and my intention with the LM2577 is obviously to step up the rectified unregulated DC voltage from 10V to 18V.
Based on the datasheet, the formula is:
VOut = 1.23 x (1 - (R1/R2))
Therefore, if my R2 is 2K, then R1 is:
R1 = ((18 / 1.23) - 1) X 2K = 27.2K
Am I correct?
I also understand that this step up process will lower the total supply current from 2.7A to 1.35A, which is ok, because my device draws a max current of 730mA.
I have also read the application note from LT written by the late Mr. Williams, about adding a ferrite bead before and after the linear regulators to help minimize the switching noise.
So before I proceed to make the board, I have just one question to ask.
Is it safe to use 1A inductors (eg: Murata 13R104C) and 1A Schottky diodes (eg: 1N5819)?
Thank you for the valuable assistance.
Regards,
Brian