Hi,
I have attached layout of Top layer, second layer, seventh layer and bottom layer (eighth layer) for your reference.
And also I have probed the output signal waveform, switching waveform, feedback signal voltage and VREF signals at power on.
The negative (-15V) was goes to -8V and rose to +12V then damped and settled at 0.3V. The same thing was observed at switching frequency output also.
The VREF signal was not settled at 1.2V . This also oscillated with 10V(peak to peak) and settled at 0V.
The feedback voltage was raised to 8V and slowly decays and reaches zero within 40uS.
I have attached all the waveforms, layout and schematic here for your reference.
Note : +15V section was working fine and this same circuit was working well in the second module.
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