Product Overview

Product Overview
NCP4305: Secondary Side Controller, Synchronous Rectification, for High
Efficiency SMPS Topologies
For complete documentation, see the data sheet
Product Description
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
• Precise True Secondary Zero Current Detection with
Adjustable Threshold
• Typically 20 ns Turn off Delay from Current Sense Input to
Driver
• Zero Current Detection Pin Capability up to 200 V
• Optional Ultrafast (7ns) Trigger Input
• Disable Input
• Adjustable Minimum ON Time and Minimum OFF Time
•
•
•
•
Self Synchronization
8 A Sink, 4 A Source Drive capability
Light Load Detection with Modulated Gate Drive
4.5 V & 9 V UVLO Options and 36 V(Max)
For more features, see the data sheet
Applications
• High Power Density AC/DC Power Supplies
Benefits
• Allows for proper timing of SR MOSFET turn on and turn off
• Maximizes conduction time of the MOSFET to increase
efficiency
• Allows direct connection of CS input to MOSFET drain in
flyback applications
• Improves performance for applications working in deep CCM
• Enters the IC into a low consumption standby mode
• Prevents accidental MOSFET turn on or turn off due to
ringing
• Ensures proper DRV pulses during operation
• Fast turn off of MOSFET for optimized conduction period
• Increased stability coming in and out of Light Load
• Wide output operating voltages
End Products
•
•
•
•
Notebook Adapters
Server Power Supplies
ATX & All-in-one Power Supplies
High Density USB Adapters
Part Electrical Specifications
Product
NCP4305ADR2G
Compliance
Status
VCC Max (V)
Vref Typ (V)
ICC Max (A)
TA Min (°C)
TA Max (°C)
Package Type
Pb-free
Active
37
N/A
0.0056
-40
125
SOIC-8
NEW
37
N/A
0.0056
-40
125
WDFN-8
Active
37
N/A
0.006
-40
125
SOIC-8
Active
37
N/A
0.006
-40
125
DFN-8
NEW
37
N/A
0.006
-40
125
WDFN-8
Active
37
N/A
0.006
-40
125
SOIC-8
Halide free
NCP4305AMTTWG
Pb-free
Halide free
NCP4305DDR2G
Pb-free
Halide free
NCP4305DMNTWG
Pb-free
Halide free
NCP4305DMTTWG
Pb-free
Halide free
NCP4305QDR2G
Pb-free
Halide free
For more information please contact your local sales support at www.onsemi.com
Created on: 6/30/2016