They are Junk!
I had my last one running this afternoon, and for one hour it was fine.
I went away and came back in another hour, my workshop was smokey and chip number 5 had gone short circuit. It was only running at 130mA and the chip was running cool. It did actually run very cool for the work it did. I once had it up to 800mA.
I initially had 29 volts, 130mA running into the chip but now I had 450mA running into it (I didn't read the voltage but It would have dropped to about 3-6 volts at a guess).
My current limiting supply had gone into limit mode and I had 450mA running through a breadboard to my chip. The heat in the chip was making the smoke and now it is stuck to the breadboard, I will send a photo, soonish. My smoke alarm didn't go off, it only goes off for normal cooking smells. sigh.
The only excuse I could find for this chip is that the circuit was breadboarded, and you shouldn't do this at High frequencies, but I dont actually believe the breadboarding of this circuit was a problem.
In short the NCL30160 is junk. Dont use it for your own safety.
If you look at the block diagram the short seems to be in the built in voltage regulator.
A timely reminder to take precautions when doing power electronics,
- smoke alarm
- current limited supply
- fuses
- watch closely