Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

Motor Control ICs Forum Discussions

SSJP
Level 1
25 sign-ins 10 sign-ins 5 sign-ins
Level 1

Hi

Question is regarding the behavior of VO1 and ERR pin of TLE9180 IC.

While reducing the VS supply slowly from 10V to 0V, around VS=4.6V, VO1 and ERR pin are pulsating at random frequency from 2.5V to 0V and 3.3V to 0V respectively.

Other pins status during this period is : CB=8.6V, INH = Hi.

Can not find the satisfactory reason  for this and is it normal operation?

(Probably IC is in ROP as operating within VVSROP).

Thanks.  

0 Likes
1 Solution
RupakC
Moderator
Moderator 100 replies posted 100 sign-ins 25 solutions authored
Moderator

Hi @SSJP 

What you observe is correct. Please find the explanation below: 

In this case, you are observing the transition to reduced operation mode of the device. In Reduced Operation mode, the logic is operational but the IOs are not properly supplied and therefore SPI communication does not work and all digital pins are disabled. The output stage of the operational amplifier is also not supplied. This means the device function is not anymore given. 
Vs=4.6V is around the range of voltage where the device enters this reduced operation mode. The pulsations of the voltage is due to the device moving in and out of the reduced operation mode. 
For further explanation on the reason for the pulsations, please note that the OpAmp and the Digital outputs are not supplied during reduced operation mode. Hence the VS pin has less current consumption and so the VS pin voltage increases slightly. This triggers the device to exit from the reduced operation mode. Now, in the normal operation mode, the OpAmp and I/O are again activated and so the VS pin voltage again drops. This fall in VS voltage results in re-entry of the device in reduced operation mode. The fluctuation width when VO1 is enabled again, when reduced operation mode is exited should be in range of 20 – 30us

Regards

RupakC

View solution in original post

0 Likes
3 Replies
RupakC
Moderator
Moderator 100 replies posted 100 sign-ins 25 solutions authored
Moderator

Hello @SSJP 

May I know which IC are you using ?the TLE9180D-21QK or 31QK ?

Thank You

RupakC
0 Likes
SSJP
Level 1
25 sign-ins 10 sign-ins 5 sign-ins
Level 1

Hi

We are using IC TLE9180D-31Q

Thanks

0 Likes
RupakC
Moderator
Moderator 100 replies posted 100 sign-ins 25 solutions authored
Moderator

Hi @SSJP 

What you observe is correct. Please find the explanation below: 

In this case, you are observing the transition to reduced operation mode of the device. In Reduced Operation mode, the logic is operational but the IOs are not properly supplied and therefore SPI communication does not work and all digital pins are disabled. The output stage of the operational amplifier is also not supplied. This means the device function is not anymore given. 
Vs=4.6V is around the range of voltage where the device enters this reduced operation mode. The pulsations of the voltage is due to the device moving in and out of the reduced operation mode. 
For further explanation on the reason for the pulsations, please note that the OpAmp and the Digital outputs are not supplied during reduced operation mode. Hence the VS pin has less current consumption and so the VS pin voltage increases slightly. This triggers the device to exit from the reduced operation mode. Now, in the normal operation mode, the OpAmp and I/O are again activated and so the VS pin voltage again drops. This fall in VS voltage results in re-entry of the device in reduced operation mode. The fluctuation width when VO1 is enabled again, when reduced operation mode is exited should be in range of 20 – 30us

Regards

RupakC
0 Likes