TIDT291 June 2022
This reference design uses the LM51551 as a secondary side regulated (SSR) flyback controller. It converts an input of 8–28.8 V to 24 V at a max power of 28.8 W. The supply starts up at a minimum input of 15.5 V and can operate down to 8-V input. The design also includes the synchronous buck converter, LMR33620, to step down 24 V to 5 V. This design features the option to evaluate either the TPS26631 eFuse or LM74700 ideal diode controller as input protection devices.