Transition trouble

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Regards,
Paul

Dear,

  I use the MAX44284. This compoents is used for measuring the current of a GaN transistors. In transient time at low temperature the measurement starts at 0.6 A even if the real current is about 1.3 A. This transient time occurs 8 seconds. Too long for our regulation loop. Besides it can affect the MTBF of the transistors. 

Anybody have solution to cancel this effect!

Thank you !

Hello Ludoprana,

Can you share your schematic diagram? Thank you.

Regards,
Paul

Please, find the schematic.

Hello GLADION and maaarmas,

Can you help in Ludoprana's issue above? Thank you. It seems to be related to this query: (+) Transient Issue with MAX44284 - Q&A - Specialty Amplifiers - EngineerZone

Regards,
Paul

We try to add a RC filer at the output of the MAX44284 -> The issue is the same.

Could it be important to have a transient time without over current and over voltage. The load is composed by lot of capacitors.

Do you have any standar schematics ?

We have continued the investigation of the effect at low temperature. We saw the component do not work wee is its environement temperature is below 5 °C. The current read is 6 times lower compared to the value.

Addition to this we added a thermal source o this component. We saw the transient time is reduced a lot. It could be about 1second compared to the 10 s in standard.

We change the electric schematics to be closed to your datasheet's suggestion. No change of the issue.

We have controlled the voltage on the RS+ and RS- on the component's pins. It is correct even if the voltage at the output is wrong.

Please, may you have any advices ?

We have continued the investigation of the effect at low temperature. We saw the component do not work wee is its environement temperature is below 5 °C. The current read is 6 times lower compared to the value.

Addition to this we added a thermal source o this component. We saw the transient time is reduced a lot. It could be about 1second compared to the 10 s in standard.

We change the electric schematics to be closed to your datasheet's suggestion. No change of the issue.

We have controlled the voltage on the RS+ and RS- on the component's pins. It is correct even if the voltage at the output is wrong.

Please, may you have any advices ?