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LNK3204D no output voltage

Posted by: mpuc on 03/17/2021

Hello,
I am using the LNK3204D circuit in the project but the circuit does not give any output voltage. The system of work is specific because the mass is at the level of the mains voltage. The system is to provide an output voltage of 12V modeled on the RDR-506 design. The values of the resistors R1, R2, R3 were taken from the general catalog note.

The DCDC AP65111AWU-7 converter is connected to the voltage of 12V, which lowers the voltage to 3.3V for microprocessors, and the relay which is controlled by the microprocessor (by default it does not work). I tested the system without load, i.e. only a DCDC switch and a relay, and I have no voltage at the output of the LNK3204d system.

What could be causing this behavior?
Additional capacities at the output of the LNK3204 chip from the AP65111 chip?
Is it necessary to change the values of the resistors R1, R2 and R3 to those included in RDR-506?

Enclosed is my circuit schematic.

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Submitted by mpuc on 03/18/2021

I found a reason why my device worked. This required checking each element in turn. In my case, it was a damaged D4 diode (from my diagram).

The diode was probably damaged during assembly because the system did not work from the beginning.

Submitted by PI-Radiant on 03/24/2021

Hello,
Thank you for using our product. Has the issue been resolved? Would you like to receive any other inputs from us?

Regards
PI-Radiant