The NCP4305 is high performance driver tailored to control a synchronous rectification MOSFET in switch mode power supplies. Thanks to its high performance drivers and versatility, it can be used in various topologies such as DCM or CCM flyback, quasi resonant flyback, forward and half bridge resonant LLC. The combination of externally adjustable minimum off-time and on-time blanking periods helps to fight the ringing induced by the PCB layout and other parasitic elements. A reliable and noise less operation of the SR system is insured due to the Self Synchronization feature. The NCP4305 also utilizes Kelvin connection of the driver to the MOSFET to achieve high efficiency operation at full load and utilizes a light load detection architecture to achieve high efficiency at light load. The precise turn−off threshold, extremely low turn−off delay time and high sink current capability of the driver allow the maximum synchronous rectification MOSFET conduction time and enables maximum SMPS efficiency. The high accuracy driver and 5 V gate clamp enables the use of GaN MOSFETs.
●Features | | Benefits
●---|---|---
● | | | | |
● Precise True Secondary Zero Current Detection with Adjustable Threshold
●| |
● Allows for proper timing of SR MOSFET turn on and turn off
● Typically 20 ns Turn off Delay from Current Sense Input to Driver
●| |
● Maximizes conduction time of the MOSFET to increase efficiency
● Zero Current Detection Pin Capability up to 200 V
●| |
● Allows direct connection of CS input to MOSFET drain in flyback applications
● Optional Ultrafast (7ns) Trigger Input
●| |
● Improves performance for applications working in deep CCM
● Disable Input
●| |
● Enters the IC into a low consumption standby mode
● Adjustable Minimum ON Time and Minimum OFF Time
●| |
● Prevents accidental MOSFET turn on or turn off due to ringing
● Self Synchronization
●| |
● Ensures proper DRV pulses during operation
● 8 A Sink, 4 A Source Drive capability
●| |
● Fast turn off of MOSFET for optimized conduction period
● Light Load Detection with Modulated Gate Drive
●| |
● Increased stability coming in and out of Light Load
● 4.5 V & 9 V UVLO Options and 36 V(Max)
●| |
● Wide output operating voltages
