A problem met in the design of switching power supply
A problem met in the design of switching power supply
Hi, I'm using a switching power supply chip LM2575 to drive the load by turning DC voltage 24V to 1.5V. It works well except a problem...
Everytime when the power’s off, the capacitor C2 (maybe?) will still supply power to the load for a short period. Due to this, I cannot turn off the load immediately.
If the problem is not caused by C2, then what’s the cause?
I wonder if there are any solutions to this problem?
Sorry for my poor English, but I really need your suggestions! Thanks in advance!
(R3 is the load)
Everytime when the power’s off, the capacitor C2 (maybe?) will still supply power to the load for a short period. Due to this, I cannot turn off the load immediately.
If the problem is not caused by C2, then what’s the cause?
I wonder if there are any solutions to this problem?
Sorry for my poor English, but I really need your suggestions! Thanks in advance!
(R3 is the load)
Re: A problem met in the design of switching power supply
Try reducing the value of C2. Also, if you need the voltage on R3 to drop very quickly, try a double-pole switch - one pole to switch the input to the chip, the other to switch the supply to R3.