TLV2252AM: Why is the output unstable with op amps like the TLV2252?

Norihiro Yoshii

Part Number: TLV2252AM
Other Parts Discussed in Thread: TLV2252A, TLV2252

Tool/software:

Even though the input conditions are the same with op amps like yours, the TLV2252A, sometimes there is output,
and sometimes there is no output. The waveform of the synchroscope has many spikes that are detected when noise is occurring.

As a countermeasure, make the GND pattern thicker.
The power supply seems to be stable.
Are there any other countermeasures?

1 month ago

0 Ron Michallick 1 month ago

TI__Guru*** 145036 points

Hello Yoshii-san,

Does unstable mean out oscillation or output turn on and off? This op amp have limited output current drive, is the load too heavy, (high current demand)?

0 Norihiro Yoshii 1 month ago in reply to Ron Michallick

Prodigy 30 points

Sorry for the lack of explanation.
When the power is turned on and off, it sometimes works correctly and sometimes does not work at all.
Details: When the power is turned on and off and a voltage is applied to the op amp,

does the OUT pin remain stable and output the expected pulse?

Or does it sometimes remain at 0V?

In that sense, the operation is unstable.

0 Ron Michallick 1 month ago in reply to Norihiro Yoshii

TI__Guru*** 145036 points

Are not aware of this effect on TLV2252. Do you have captured waveforms for this effect? Also look for voltage transients below ground on the device pins.

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TLV2252AM: Why is the output unstable with op amps like the TLV2252?