Hi, I'm a Chinese student. I'm using a switching power supply chip LM2575(http://www.kynix.com/uploadfiles/pdf9675/LM2575-12BN.pdf) 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!
Here's the schematic:
(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!
Here's the schematic:
(R3 is the load)