Hi,
I have designed a 5V 3A supply for a medical device using the PTH08T261W it works fine when I prototype it but when I try to make another prototype the module fails to work I have observed that even adding a wire to connect the resistor to ground changes the output voltage and even the slightest change in the sense +,- Pins will cause the power supply to shutdown and not supply 5V?
Is this because of the design or due to external factors as I am prototyping on a proto board with wires?
Attached below is the schematic I am using on my PCB and proto board are they any issues that I have to correct in the design?
My output is stable on my first prototype 5V but on the second and third it varies between 4.7-4.5V and I am using the exact same parts even the slightest change in the resistor or the sense pins and the power supply fails to function as intended?
I am using a 330UF nichicon Digi key: 493-13755-1-nd 20% 25V electrolytic polymer CAP for the input (12V 2A adapter input) and the 2 output capacitors are Digi key: 587-3152-1-ND 100UF 16V X5R 1210CERAMIC CAPS.The resistor I am using is a 169 ohm 1% 1/8W 0805 -RHM169AHCT-ND.
At load, the voltage for 5V is around 4.8V the load I am connecting the power supply to draws 5V 2.1A.
Please let me know if there are any problems in the design or the parts and why the power supply fails to work.