probably was the heat of the solder gun if you did this by hand.
- i would change R1 and R4 to 5K. just helps turn off faster when you suddenly lose control voltage.
- C4 should be film type cap, definitely not electrolytic. you need a cap that can discharge fast, charge fast, and have little internal impedance.
- J4, looks like you intended to supply the driver chip, but the ground is different. could be a type-O?
- put a 0.1u in parallel with C1, the dV/dT of your switch will create high frequency (>1MHz) noise.
- this is just my habbit.. but i would put another gate resistor of same value in parallel with R2 (& R3) . then also add a D4148 with cathod pointing towards driver chip. this give you the opportunity to tune the turn ON/OFF separately from each other.
- R2 and R3 should be placed as close to the mosfet as possible, with the drive chip and big cap also close by. minimize the loop distance. those resistors R2, R3 are usually hard to cool.. they get hot and they are not on a heatsink (too much parasitic capacitance to ground, so not connected to a cold plate). therefore, they should be way over designed.. i.e. if you calculate 1W resistor.. put a 5W. ..
Mr.Cool