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LM3429 / Gate and SW waveform

Tsukui Yusuke
Guru 21930 points
Other Parts Discussed in Thread: LM3429
Hi Team,
 
I'd like to ask about LM3429(boost regulator).
My customer is using the LM3429 under the following condition.
◇Vin=8-12V、Vout=18.3V(LED×6  Vf=3.05)、Iout=20～150mA.
 
Now customer is having trouble Gate of waveform is disturbed.
I Attached simulation data based on customer circuit condition.
Can you check the attached file?
 
Could you tell me the cause of the disturbance of the gate and SW  waveform?
If you insert a resistor to A, it became a normal waveform.
I attach the materials were compared.
 
Is there something wrong with the phase compensation circuit?
Or other causes?
 
Best Regards,
Yusuke　/ Japan Disty