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the Self-Excited Oscillation of OPA551

edited September 2017 in Electronics

Because my project need 24 voltage output, output voltage cascade such as every 4V, The 24 cascade is 4*24=96V.
Every output voltage is solation voltage+DAC( because the small ouptut current of DAC, the output driving current I need is 150mA at least). So here I chose OPA551UA to be the volloge follower to increase driving.
I texted the board which I have drawn, however,I found that if the voltage of 6~7 over 4V,( output shows oscillation waveform ); while when here just 4 has the voltage output( 4V and others keep 0V ),the output has no any osillation.
The wave is as following:

According to the dataheet of OPA551UA, I have tried to add R1 and R2(10K), Gain=2,but the problems still didn’t be solved ! In addition, I also have tried to add a 1ohm resistance in the output,but it’s still useless!
Who can help me ? Thanks in advance !

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