ISO1410: ISO1410BDW overheating
Part Number: ISO1410
I'm using ISO1410BDW in a custom design based on "ISO1410DW evaluation module". The Integrated circuit comes to 50 Celsius degree, The R4 is connected and the DNI components are no connected except the TVS in A and B terminals.
The transmit speed is 100kHz.
The ambient temperature is 29 C and temperature was measured with a thermographic camera.
Vcc1= 5V, Vcc2 =3.3
The current Icc1 and Icc2 are 130mA
Is this a normal functional temperature?
is there any technique to make the IC colder?
The ISO1410 should not be drawing this much current and therefore should not be getting this hot. I have a few questions to help understand the situation further.
1. Did you add a TVS diode to the EVM? If so, what is the part number? Can you try removing the TVS diode and measuring current again?
2. Is there anything on the RS485 bus besides the EVM? If so, can you measure the current with the EVM only and nothing else on the RS485 bus?
2. Can you measure Icc1 and Icc2 separately?
3. Can you provide an image of the EVM you have with the part number of the ISO1410 clear in the picture?
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In reply to Lucas Schulte9:
The TVS model is CDSOT23-SM712.
icc2= 130mA with TVS.
Icc2 = 60mA without TVS
icc1 = 130mA
In reply to Abraham Perez Trujillo:
It appears that the TVS diode is causing a negative effect with the ISO1410 being that there is a big difference in Icc2 current. It appears that the ISO1410 may have even been damaged since Icc1 should not be that high.
I recommend replacing this particular ISO1410 with a new one, leaving the TVS diode unpopulated, and retaking measurements.
We need a TVS for EMC tests, Could you recommend a TVS Model?
The SM712 should work just fine as it is meant to comply with the RS485 hardware protocol. Something else here has most likely caused damage to the ISO1410. Could be the power supply or something on the RS485 bus. The goal is to eliminate variables for now and see what has caused this.
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