Other Parts Discussed in Thread: LM5117
I am attempting to modify LM5117EVAL board to generate 20V output with 9A current capacity.
Using the LM5117 Quick Start Calculator, I found that the only R16 (357Ohm) should be changed to 208Ohm resistor.
However, the resulting circuit gives strange behavior as follows
1) Without connecting any load, the board gives 20V output as expected,
2) But as soon as connecting any load (such as 1KOhm resistor), the output drops to a few mili volts and chip may be damaged
3) Once damaged, the board does not give any output voltage even without any load.
Before modifying the value of R16, I tested the original board of 12V/9A and the board operates well as expected.
(The only change is the value of R16 based on the quick start calculator)
Since the board does not operated as soon as load connected, I cannot find any clue to fix the problem.
Pleas give me some advice or comment on this strange board behavior.