AMC1311: AMC1311

Hi Noida,

what is U40 and U41?

Kai

XTPSI2140QDWQRQ1

Hi Ramesh,

So, can you tell us a little more about the 1200V source?  Will AMC_P essentially be between two 600V batteries/power sources?  Schematically, you have R200 as 499 and the others are 499K, so is that a typo?  D26 on the AMC1311 input is probably not necessary, but you might want to add a low-pass filter there.  I see GND3 on the AMC1311 bypass caps and GNDA at pin 4.  These two points have to be the same ground. V_ISOL, depending on the voltage divider on the inputs, may saturate the ADC.  That line should also have a series R to help isolate the OPA from the ADC - depends on what the part is in the end.

Thanks TOM,

Please find my response 

(1) So, can you tell us a little more about the 1200V source?

OGO: source is battery --multiple module can be added in series---1200 V is maximum input 

I am sensing voltage using AMC1311 and it is working perfectly

(2) you have R200 as 499 and the others are 499K, so is that a typo

OGO: Yes, it is typo error , it is again 499 K 

(3) D26 on the AMC1311 input is probably not necessary

OGO: it is not optional for protection (Zener Diode) but it is not mount currently

(4)  I see GND3 on the AMC1311 bypass caps and GNDA at pin 4,  I see GND3 on the AMC1311 bypass caps and GNDA at pin 4.  

OGO: GND3 ,GNDA both are same net and shorted with External Earth pit with 0 ohm resistance.

(5) V_ISOL, depending on the voltage divider on the inputs, may saturate the ADC.  

OGO: we will use divider for max input to AMC1311 less than 2.0 V DC.

Is possible to measure the HV Pos and HV Neg with reference point Earth.

Thank you for clarifying! 

what is next

Can you add the battery stack to your schematic?  I'm trying to understand what the AMC1311 will see at its input if:

• U41 is ON and U40 is OFF
• U41 is OFF and U40 is ON
• U41 and U40 are both ON

• U41 is ON and U40 is OFF---Read HV Positive voltage
• U41 is OFF and U40 is ON--Read HV Negative Voltage