i have a big problem. , i state that i don't have much knowledge of smps, but i like to build audio amplifiers. time goes I bought from China grande smps llc pusch pull full bridge 3000watt..some time ago a big lightning bolt destroyed many products of the house, and this smps too .... unfortunately I can't repair it because many pieces have the name deleted replacing them with uncertain pieces scares me .. lately i came across these smps power supply circuit with ir21531. i saw that they are very simple to make and very efficient. i would like to try to build one of these smps to power a powerful subwoofer. from a careful study I was able to read the power MOSFETs they are stw45nm50 and I also believe the l6599d driver. but despite the replacement it does not work properly, it emits a loud buzz and does not hold the load ..... so here is my question, i want to replace all control and edit smps, but i need some help ... meanwhile l The amplifier that I have to power works with double 70v, it generates an audio power of 1000watt RMS on a load of 8hom. the power supply fuses are 6ampere per branch, so I think 1kw of smps is enough. my idea is to recover all the components of the old smps and rebuild it using this ir21531 or higher model ir2155 as driver and a pair of stw45nm50 to push the etd49 transformer. the primary MOSFETs are all tested and working, the transformer is good, the secondary is completely intact .. do you think ir2155 can drive stw45nm50? can you recover this smps?