UCC24612 is a high performance synchronous rectifier controller and driver for standard
and logic-level N-channel MOSFET power devices. By implementing a near-ideal diode emulation
UCC24612 reduces losses of the output rectifier and indirectly the primary side losses. The drain
to source (VDS) sensing control scheme allows UCC24612 to work with multiple
topologies, such as Active Clamp Flyback, QR/DCM/CCM Flyback and LLC, et.
Integrated features simplify the design effort, enabling UCC24612 to excel in a variety
of applications and frequencies. The wide operating VDD and VD voltage ranges enable simple
implementation in systems with outputs up to 28 V. Efficiency and noise immunity is enhanced with
adaptive minimum off-time. Variants UCC24612-1 and UCC24612-2 offer different minimum on-times to
provide additional noise immunity. Robust operation in continuous conduction mode (CCM) is further
enhanced with proportional gate-drive and CCM cycle limit pre-turn-off.
UCC24612 has multiple features that improve efficiency. The fast comparator with short
propagation delays reduces switching loss. The 9.5-V gate drive clamp reduces MOSFET driving
losses. Frequency dependent standby modes further decreases standby power. These features help
UCC24612 be part of a greater system that meets stringent efficiency standards such as Department
of Energy (DoE) Level VI and Code of Conduct (CoC) Tier 2.
UCC24612 is available in a SOT23-5 package.