TOP264EG PI expert and no current on output
Good morning Sir
I used PI expert to design a 230V - 4.3V 10A PS , following your PI expert detailed , the PS with 10 OHM on LOAD drop voltage from 4.2V to 3.1V , anything burns , anysthing seems stressed , i dont undersatnd the problem . Attached you can find PI expert generated file.
Attached also the scope screen of primary side of transformer.
Seems an overcurrent occured , Current control is disabled and pin is connected directly on gorund , all value and schematic are from PI exp.
Final destination of PS is amicrocontrolled battery charger (adding electronics).
Transformer was build following PI expert data (and verified by simple math).
Thank you for you r support and have a great day.
コメント
Hi PI-Picard
Thank you for your reply
During these days i try to discover the problem successfully , the problem was on the optocupler , it is as indicated 2501 , but for the first time in my life the device seems not in range or partially faulted , i seen a strange signal on control pin compared with a working demo so i removed optocupler and new one exactly the same (different supplier) work perfect. Now power supply is working properly .
Thank you again and have a great day!
Hi Claudio
Great work then! :)
I am curious, can I look at your circuit?
Regards,
PI-Picard.
Hi
Here the circuit , dont mind the component added , the circuit is connected to microcontroller and have to unconnect resisitors when Net disapperas , during bench test this circuit was fully disabled , as you can see the circuit is exactly as PI expert suggest.
I confirm the problem was in faulted opto coupler , never happens in 20 years , i find it really strange but ... it is. The circuit is working under programmed load continuosly and work as expected.
Thank you.
| Attachment | サイズ |
|---|---|
| Diagram circuit (79.67 KB) | 79.67 KB |
Hi Claudio,
Well you are right in your analysis and it is what made it work.
Thank you,
PI-Picard
Hi Claudio,
Thank you for considering our TopSwitch-JX device,
To better understand the issue, I have the following questions:
1) Can you clarify that you connected the control pin to the ground? If yes, you should remove the short and connect the required control pin capacitor. So you are not using the optocoupler feedback? May I ask why do you need to disable the control pin?
2) If you did not connect the 10 Ohm load across the output, will it power-up or will the output voltage be 4.3V (4.2V)?
3) At what maximum load will the output stay at 4.2V?
Regards,
PI-Picard