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NCP4318 Datasheet

Advanced Synchronous Rectifier Controller

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Advanced Synchronous
Rectifier Controller for LLC
Resonant Converter
NCP4318
NCP4318 is an advanced synchronous rectification (SR) controller
for LLC resonant converter with minimum external components. It
has two gate driver stages for driving the SR MOSFETs which are
rectifying the outputs of the secondary transformer windings. The two
gate driver stages have their own Drain and Source sensing inputs and
operate independently of each other. The advanced adaptive dead time
control compensates a voltage across parasitic inductance to minimize
the body diode conduction and maximize the system efficiency. The
advanced turnoff control algorithm allows stable SR operation over
entire load range. NCP4318 has two versions of pin assignment –
NCP4318AXX, NCP4318BXX.
Features
Mixed Mode SR Turnoff Control
Anti Shootthrough Control for Reliable SR Operation
Separate 200 V Rated Sense Pins for the Drain and Dedicated Source
Sense Pins
Advanced Adaptive Dead Time Control
SR Current Inversion Detection
Adaptive Minimum Turnon Time for Noise Immunity
SR Conduction Time Increase Rate Limitation
Multilevel Turnoff Threshold Voltage
Adaptive Gate Voltage Control (10 V, 6 V)
Low Operating Current (100 mA) in Green Mode
Soft Start for 512 Switching Cycle with 0 V/6 V Gate Output Voltage
Very Fast Turnon and Turnoff Delay Time (30 ns/30 ns)
Large Gate Sourcing and Sinking Current (1.5 A/4.5 A)
Wide Operating Supply Voltage Range from 6.5 V to 35 V
Wide Operating Frequency Range (22 kHz to 500 kHz)
SOIC8 Package
These Devices are PbFree and are RoHS Compliant
Applications
High Power Density Adapters
Large Screen LEDTV and OLEDTV Power Supplies
High Efficiency Desktop and Server Power Supplies
Networking and Telecom Power Supplies
High Power LED Lighting
www.onsemi.com
SOIC 8, 150 mils
CASE 751BD
MARKING DIAGRAM
8
NCP4318
UVW
AWLYYWW
1
U = Pin Layout, A and B
V = Frequency, H: High, L: Low
W = Additional IPT option
A = Assembly Location
WL = Wafer Lot Traceability
YYWW = Date Code
PIN CONNECTIONS
NCP4318AXX
GATE1
GATE2
GND
VDD
VS1
VD2
VD1
VS2
NCP4318BXX
GATE 1
GATE 2
GND
VDD
VD1
VD2
VS1
VS2
(Top View)
ORDERING INFORMATION
See detailed ordering, marking and shipping information on
page 3 of this data sheet.
© Semiconductor Components Industries, LLC, 2020
1
June, 2021 Rev. 3
Publication Order Number:
NCP4318/D


  ON Semiconductor Electronic Components Datasheet  

NCP4318 Datasheet

Advanced Synchronous Rectifier Controller

No Preview Available !

Bridge
VAC
EMI
Filter
Diode
PFC
Stage
Cin
Q1
Q2
NCP4318
Roffset2
M2
Optional
Cr
Lr
Lp
VO
CO
RO
LLC
Controller
Roffset1
Optional
M1
Figure 1. Typical Application Schematic of NCP4318
Shunt
Regulator
IOFFSET1
VTH_HGH
VD1
VTH_ON
VD1_HGH
SR
Conduction
SR_COND1
DLY_EN1 RUN
Adaptive
turnon
delay
D Q SET
Turnon
Q CLR
VS1
GATE1
VTH_OFF1
Adaptive
VGATE
GATE
CLAMP
Adaptive
Tmin_on
VD1_HGH
Turnoff
SRC_INV1
Adaptive
dead time
control
IOFFSET1
VTH_OFF1
VG1
VD1
GREEN
SR_COND2
VD2_HGH
SR
Conduction
RUN DLY_EN2
D Q SET
Q CLR
Turnon
Adaptive
turnon
delay
VTH_HGH
IOFFSET2
VTH_ON
VD2
Turnoff
SRC_INV2
IOFFSET2
VTH_OFF2
Adaptive
dead time
control
VTH_OFF2
Adaptive
Tmin_on
VD2_HGH
Adaptive
VGATE
GATE
CLAMP
VG2
VD2
VS2
GATE2
SR Current Inversion detect
VDD_GATE_ON /VDD_GATE_OFF
SR_COND1
SR_COND2
VDD
SRC_INV1 DLY_EN1
DLY_EN2
SRC_INV2
SOFT
START
GREEN
SS_7V
RUN
SR_COND1,2
VD1_HGH
Protections
VTH_OFF1
HFS
OTP1
GREEN MODE
VGATE
Control
GND
Figure 2. Internal Block Diagram of NCP4318
GREEN
Adaptive
VGATE
www.onsemi.com
2


Part Number NCP4318
Description Advanced Synchronous Rectifier Controller
Maker ON Semiconductor
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NCP4318 Datasheet PDF






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