Problem:
I am using two LM5050 as ideal diodes (ORing) for two input voltage. The IN pin of the primary LM5050 has a voltage of 30V and the IN pin of the secondary LM5050 is not connected to anything. In a normal operation, the secondary LM5050 will heat up by around 6 degree celcius. After some investigation, it was found that there was a ~4mA flowing into the OUT pin of the secondary LM5050 at 30V. If I swap the voltage from the primary LM5050 to secondary one, then the primary one will heat up. I tested this on a few prototype and they all produce the same results.
Steps Needed to Recreate Problem:
Construct a LM5050 ideal diode circuit. Measure the temperature on the LM5050 which is turning out the pass FET.
Additional Information:
I have taken an eval board and connect a 30V at the OUT pin to replicate the issue. I am seeing a ~8 degree Celcius rise. The current flowing in the OUT pin is about 3.5mA.
LM5050 eval board OUT pin connected to voltage through a shunt resistor for current measurement. IN is not connected to anything
LM5050 on eval board heats up
Question:
Looking at the block diagram, it seems like there isn't any path for a 3.5mA current to flow into OUT pin. I would like to understand why does this chip behave this way?
A similar issue can be seen here.
http://e2e.ti.com/support/power_management/power_interface/f/204/p/179691/665603#665603.
