SMPS Power Supply design review

[Warsp]

Hello all.
Since this the first time I have designed an SMPS, I would like someone to look over the schematic to see if I did something stupid that would cause something to go wrong. Output voltage is ~170V and +5V. All resistors are 1/4W and all capacitors have a suitable voltage rating. I plan on breadboarding and eventually making a PCB for this design so I would like to improve the chances of this working first try. All help and suggestions are appreciated.

[Benta]

Looks a bit strange...
The NCP1072 is designed as a flyback converter, but you seem to be using it in forward mode.
And is it OK that your 170 V are not isolated from the mians? I don't know your application, but that seems potentially dangerous to me.

[Warsp]

The design I made is based off of a design in the NCP1072 datasheet, so I think it would work fine. As for isolating 170V would I be able to just use a choke since it is similar to a 1:1 transformer? I am only going to be drawing ~6mA and I could probably wire it to the NCP1072 mosfet. I know that chokes are not made for this use and are pretty inefficient but for what I am using it for would it work?

[T3sl4co1l]

Yeah transformer phasing is backwards. Take a close look at the dots on the windings!  Double check the transformer datasheet as well.

VD doesn't have a ground reference to the connector, and is mains referenced, as mentioned.  Better to just not do it at all.  If you're doing like nixies or something, better to use a secondary side boost/flyback, yes, more stages, who cares, it's low power.

C? is way too large, I... oh, no designators. The 22nF GND-GND one.  Too much ground leakage.

L? 10uF is pretty large, probably doesn't matter but 1uH would be enough.  Depending on what you're running, it might not be needed at all (and the second cap).

The 0.1 compensation cap may want a resistor in series.  Even if you don't end up using it (0-ohm jumper), good to have the option.

Cheers!
Tim