Hello,
I want to fix a +12V potential in the output with a +24V input.
My problem: When the output current is higher than 600mA (with a charge of 20R), the voltage falls progressively.
All the capacitors are low ESR, and dimensioned by the datasheet.
The shottky diode is a fast diode for switching power supply.
The inductance is for switching power supply too.
I had ask for an eval and I have comparativ mesure.
The eval have a LM2670-ADJ, so, the frequency is doubled.
Comparative mesure with the eval in signal 1 and my circuit in the second signal.
The load is 500 mA.
With this load, i have no problem, +12V without a lot of ripple in output.
Now with 1A Load:
With this charge, I have around 10V.
I hope someone has an idea to solve my problem?
Thank you for reading this,
Best regards,
Lucien Badoux