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MC34063A: Abnormal Assistance

GARETH OU
Guru 12185 points

Part Number: MC34063A

Hi

The customer has a question

1.Are there different L/C in the same reel? (OAETD + OATEN )

2.The test waveforms of normal and abnormal products are as follows 

Input 12V; L2 ON period measured about 5usec; ​​TC measurement, amplitude/period stable.

D/C TI53M 

WAVE 1.jpg

Abnormal Item:TI52M AETN

When inputting 12V, the TC test point is abnormal, with large amplitude and period. Furthermore, the Q1 ON period is unstable.

WAVE 2.jpg

What causes cycle instability?

SCHEMATIC.jpg

  • 0
    TI__Guru 70785 points

    Hello GARETH,

    Yes, it is possible to have devices with different lot trace code in one reel.

    I am sorry, but I do not understand what you are seeing as issue. Can you please explain why you have a resistor from the switch node to the TC pin? Please check if the behavior changes when you remove this resistor.

    Best regards,
    Brigitte