Other Parts Discussed in Thread: TPS92515HV
I have a TPS92515HV evaluation board that I am using to control a strobe light. The strobe is intended to have a 50% duty cycle, requires about 34V output, and 1.3A. I am powering the TPS92515HVEVM with a 48VDC power supply.
For this application, I am simply providing on and off signals at 40Hz to the evaluation board. However, when compared to a photodiode, it seems to take 4-6ms to turn on (but turns off immediately). At lower frequencies (20Hz) and higher frequencies (over 60-70Hz) it seems to turn on sharply with the PWM pulse.
I am confused about why this is happening and if there may be some parts I can add to the board to eliminate the issue. I originally assumed that shutdown circuitry inside was going into idle mode due to the long off time and high required output voltage but I would then have expected a constant turn-on delay. Instead, the turn-on delay goes to nearly zero at both low and high frequencies. For instance, at 40Hz it has about 4ms of delay while at 50Hz it is more like 6ms.
Is there anything I can do? Is this how it is expected to work, or should I look in other places for an issue that could cause a lag on the rising edge only?
