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TDE1747 Input terminals reflecting supply voltage

Praveenv
Associate

Hello,

I built a test circuit similar to one provided in the TDE1747 datasheet (Figure 3). During testing, I observed that immediately after powering on, the power supply voltage appears at both inverting and noninverting terminal of the IC. This behaviour is consistent across two different TDE174 ICs.

Could you please help identify the possible root cause of this issue?

 

Thank You.

2 REPLIES 2
Joe WILLIAMS
ST Employee

Hi Praveenv

 

This post has been escalated to the ST Online Support Team for additional assistance.  We'll contact you directly.

 

Regards

Joe

STMicro Support

Andrew Neil
Super User

@Praveenv wrote:

I built a test circuit similar to one provided in the TDE1747 datasheet (Figure 3).


How "similar" ?

Please show the actual circuit that you used.

Also some good, clear photos of how you implemented it.

 


@Praveenv wrote:

I observed that immediately after powering on, the power supply voltage appears at both inverting and noninverting terminal


How, exactly, did you observe that?

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.