Below is the schematic of LT3015
POT R217 is tuned for -2.66V output voltage, When the load is applied for 50uS pulse the output of LT3015 is dipping and raising after approx 800uS. below is the scope snap shot
Note: Yellow trace Logic "0" indicates load connected(Load current approx less than 5mA) and Green trace indicates LT3015 regulator output.
I want stable -2.66V at regulator output during load also, Please suggest some circuit modifications to achieve stable output
I did the same test in the lab using demonstration circuit DC1728A for the LT3015 and in my test there is no dip on VOUT. See the scope capture and schematic images below:
Thanks for the reply.
Channel 2 green line is in 100mV scale and it is not reading -2.66V. It means channel 2 in AC coupling mode?
And during testing the C2 capacitor mounted? If yes what is the value?
If C2 was mounted Can you please repeat the test by removing it and capture the wave?
Thank you for the post. Yes - the green trace is VOUT in AC coupling mode. C2 is not stuffed. You can compare the operation of your circuit to demonstration circuit DC1728A as a trouble shooting method. DC1728A should be available through Digikey; or, your local sales representative for Analog Devices may be able to provide you with DC1728A.
Thanks for the reply
Since we have time constraint and getting the demo circuit DC1728A from analog devices will take some time.
We have performed the same test on one more board with the part LT3015 with load time of 1mS and we have observed the below readings from scope
The blue line indicates the -2.66V output and it is settling after approx >800nS.
So request you to capture one more time the -2.66V output with new load on time of 1mS pulse width and with new scope setting of 100mV/division.
If you provide that result then it will be helpful for us.
its not 800nS its 800uS