TLC2274 simulation

Hi,

I have modeled the TLC amplifier as in DMC1500 schematics. However I am unable to get the proper output values in simulation for various current ratings. The output matches for -30A, 0A and +30A (at limits only), for other current values the results are not as indicated. Pl find attached the model file (TI_TINA). Could I know what could be the reason for such behavior.

thx & rgds

30A_Current_sense_Motor_ver01.TSC

over 14 years ago

0 Britt Brooks - Online Design Tools over 14 years ago

TI__Mastermind 41310 points

I have taken a quick look at the TINA schematic and have a couple of questions.

1.) What kind of simulation are you performing? Transient, DC, AC?

2.) Was IG1 intended to be a -30A DC source with a 1A sine wave on top of it?

If IG1 was supposed to be a +/-30A sine wave, remove the DC level value and enter the Sine Wave signal option and change the amplitude to 30.

Thanks for any additional information you can provide.

Britt

0 KV over 13 years ago in reply to Britt Brooks - Online Design Tools

Expert 1800 points

Thanks for the guidance. I could able to generate the output. Please find attached the updated file with graph.

However the output graph is not linear i.e., the output voltage changes sharply as the current reaches 0 amps which is not desired. the output voltage needs to be linear. could you please review and suggest.

thanks

30A Current sense_Motor_ver01.TSC

0 Britt Brooks - Online Design Tools over 13 years ago in reply to KV

TI__Mastermind 41310 points

Is it possible that the shunt resistor is too large?

Since the application is a motor drive circuit, you may want to post it into the following forum:

http://e2e.ti.com/support/applications/motor_drivers/default.aspx

Britt

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TLC2274 simulation