Hello everyone,
I am building a bench power supply, that is realised by stepping down the 12V rail of a PSU. The pwm is done by a 555 timer and a digital pot and comparator feedback system. The problem is a voltage drop to 7 Volts at maximum pulsewidth when connected to just a 20 watt load. As a solution I want to use a multiphase buck converter topology, but I haven't found a way yet to delay the signal or alternate it between the two mosfets to split the current up evenly.
I hope that someone has an idea of how to manipulate the signal like I described or if there is a completey different approach, just let me know. Thank you in advance
PS I want to use no dedicated ICs and as little microcontrollers as possible
I am building a bench power supply, that is realised by stepping down the 12V rail of a PSU. The pwm is done by a 555 timer and a digital pot and comparator feedback system. The problem is a voltage drop to 7 Volts at maximum pulsewidth when connected to just a 20 watt load. As a solution I want to use a multiphase buck converter topology, but I haven't found a way yet to delay the signal or alternate it between the two mosfets to split the current up evenly.
I hope that someone has an idea of how to manipulate the signal like I described or if there is a completey different approach, just let me know. Thank you in advance
PS I want to use no dedicated ICs and as little microcontrollers as possible