Hello today i`m build new smps with ir2153, this schematic and pcb files are from forosdeelectronica and credits go to mniclauo. This smps was up and running but i have little problem when im feed it with high load. smps details, 2 x irf740, ir2153, run freq is 100khz, protection use current sense trafo, 4x 1n4148 + mcr100, output voltage +43.5 and -43.4, output diode mur420 x4, output inductor 25+25 laps awg 18.
Today im testing this smps with 200wrms discrete class D and solidstate with 8 output transistor (4 x 2SA1302 + 4 x 3281). testing result:
1. with class D amp play loud at max, mosfet irf540 and 9540 only warm about 38 Celsius with psu heatsink. irf740 remain cool just warm a little, 220v bridge rectifier heat raise, ntc heat raise, main trafo about 45 Celsius , mur420 heat raise, output inductor warm.
2. with solid state amp play loud at max, 4 x 2sa1302 and 4 x 2sc3281 is hot and need bigger heatsink, best if we place fan with heatsink, when play normal about half volume temp is stable. irf740 remain cool just warm a little, 220v bridge rectifier heat raise, ntc heat raise, main trafo about 45 Celsius , mur420 heat raise, output inductor warm.
regarding smps output voltage, +vcc drop 40.4 and -vee increase -45.6, there is the problem. for both test class D and with solid state amp will face same problem. This smps have no feedback and its run at 50% duty cycle all the time. from what i read from the net, smps without fb no need output filter because it will hurt output voltage. so i need opinion and suggestion from you all in diysmps and microsim to solve this problem, because i dont face this situation with ir2110 with fb there is no imbalance voltage appear.
i`ll post some picture, maybe 2-3 hours more becuase now here is about 6:36am, hehehehe early morning and no sunrise yet. i`ll post complete include schematics and pcb like usual .