I have a question about the D1/D2 of ADM2487E.
I am using ADM2487E with the same circuit as Figure34 in the datasheet.
In my circuit, When VDD1 reaches about 1.4V, D1/D2 and GND are short-circuited.
And, the overcurrent flows to the transformer.
When the voltage of VDD1 goes up further, D1/D2 starts oscillating.
I want to solve the problem of the overcurrent to the transformer until D1/D2 starts oscillating.
Could you tell me advice of the cause?
Hi Mr. K,
Table 13 in the data sheet lists Transformers that were characterised for use with the ADM2487E.
Which transformer are you using?
Is your transformer primary voltage 3.3V or 5.0V ?
Can you share your circuit schematic and part numbers?
Thank you for your reply.
I am using the transformer of Murata.
A primary voltage of the transformer is 3.3V.
And, I am using the ADP3330.
The difference with Figure34 in the datasheet is Schottky diode.
I am using Schottky diode of Shindengen for the second side of the transformer.
Is there a current limit on your Vdd1 input?
Can you share a schematic for your evaluation board?
Yes, please update me with the schematics.
There isn't current limit on VDD1 input.
I have 50pcs ADM2487E.
The problem occurs only 10 devices in this.
Is there regulations at the power on slew rate of VDD1?
I will sent you the schematic directly later.