NCP4304B PDF даташит
Спецификация NCP4304B изготовлена «ON Semiconductor» и имеет функцию, называемую «Secondary Side Synchronous Rectification Driver». |
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Детали детали
Номер произв | NCP4304B |
Описание | Secondary Side Synchronous Rectification Driver |
Производители | ON Semiconductor |
логотип |
32 Pages
No Preview Available ! |
NCP4304A, NCP4304B
Secondary Side
Synchronous Rectification
Driver for High Efficiency
SMPS Topologies
The NCP4304A/B is a full featured controller and driver tailored to
control synchronous rectification circuitry in switch mode power
supplies. Due to its versatility, it can be used in various topologies such
as flyback, forward and Half Bridge Resonant LLC.
The combination of externally adjustable minimum on and off times
helps to fight the ringing induced by the PCB layout and other
parasitic elements. Therefore, a reliable and noise less operation of the
SR system is insured.
The extremely low turn off delay time, high sink current capability
of the driver and automatic package parasitic inductance
compensation system allow to maximize synchronous rectification
MOSFET conduction time that enables further increase of SMPS
efficiency.
Finally, a wide operating VCC range combined with two versions of
driver voltage clamp eases implementation of the SR system in 24 V
output applications.
Features
• Self-Contained Control of Synchronous Rectifier in CCM, DCM, and
QR Flyback Applications
• Precise True Secondary Zero Current Detection with Adjustable
Threshold
• Automatic Parasitic Inductance Compensation Input
• Typically 40 ns Turn off Delay from Current Sense Input to Driver
• Zero Current Detection Pin Capability up to 200 V
• Optional Ultrafast Trigger Interface for Further Improved
Performance in Applications that Work in Deep CCM
• Disable Input to Enter Standby or Low Consumption Mode
• Adjustable Minimum On Time Independent of VCC Level
• Adjustable Minimum Off Time Independent of VCC Level
• 5 A/2.5 A Peak Current Sink/Source Drive Capability
• Operating Voltage Range up to 30 V
• Gate Drive Clamp of Either 12 V (NCP4304A) or 6 V (NCP4304B)
• Low Startup and Standby Current Consumption
• Maximum Frequency of Operation up to 500 kHz
• SOIC−8 Package
• These are Pb-Free Devices
Typical Applications
• Notebook Adapters
• High Power Density AC/DC Power Supplies
• Gaming Consoles
• All SMPS with High Efficiency Requirements
http://onsemi.com
8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAM
8
4304x
ALYW G
G
1
DFN8
CASE 488AF
NCP
4304x
ALYWG
1G
4304x = Specific Device Code
x = A or B
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(*Note: Microdot may be in either location)
PINOUT INFORMATION
VCC
Min_Toff
Min_Ton
Trig/Disable
18
27
36
45
DRV
GND
COMP
CS
(NOTE: For DFN the exposed pad must be either
unconnected or preferably connected to ground.
The GND pin must be always connected to ground.)
ORDERING INFORMATION
Device
NCP4304ADR2G
NCP4304BDR2G
Package
SOIC−8
(Pb−Free)
SOIC−8
(Pb−Free)
Shipping†
2500 /
Tape & Reel
2500 /
Tape & Reel
NCP4304AMNTWG
DFN8
4000 /
(Pb−Free) Tape & Reel
NCP4304BMNTWG
DFN8
4000 /
(Pb−Free) Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2012
September, 2012 − Rev. 0
1
Publication Order Number:
NCP4304/D
Free Datasheet http://www.datasheet4u.com/
No Preview Available ! |
NCP4304A, NCP4304B
Figure 1. Typical Application Example – LLC Converter
Vbulk
C1
Vcc
FLYBACK
CONTROL
CIRCUITRY
DRV
FB CS
R1
C2
D3
D4
C3
M1
R2
TR1
OK1
M2
R3
R4
R5
+Vout
C5
GND
C4
D5
R6
Figure 2. Typical Application Example − DCM or QR Flyback Converter
http://onsemi.com
2
Free Datasheet http://www.datasheet4u.com/
No Preview Available ! |
NCP4304A, NCP4304B
PIN FUNCTION DESCRIPTION
Pin No. Pin Name
Function
1 VCC
Supplies the driver
2
Min_toff
Minimum off time adjust
3
Min_ton
Minimum on time adjust
4 TRIG/Disable
Forced reset input
5 CS Current sense of the SR
MOSFET
6
COMP
Compensation inductance
connection
7 GND
IC ground
8 DRV
Gate driver output
Pin Description
VCC supply terminal of the controller. Accepts up to 30 V continuously.
Adjust the minimum off time period by connecting resistor to ground.
Adjust the minimum on time period by connecting resistor to ground.
This ultrafast input turns off the SR MOSFET in CCM applications. Activates
sleep mode if pulled up for more than 100 ms.
This pin detects if the current flows through the SR MOSFET and/or its body
diode. Basic turn off detection threshold is 0 mV. A resistor in series with this
pin can modify the turn off threshold if needed.
Use as a Kelvin connection to auxiliary compensation inductance. If SR
MOSFET package parasitic inductance compensation is not used (like for
SMT MOSFETs), connect this pin directly to GND pin.
Ground connection for the SR MOSFET driver and VCC decoupling capacitor.
Ground connection for minimum ton, toff adjust resistors and trigger input.
GND pin should be wired directly to the SR MOSFET source terminal/solder-
ing point using Kelvin connection.
Driver output for the SR MOSFET.
Min_TOFF
CS
VDD
MINIMUM OFF
TIME
GENERATOR
VDD
100 mA
DETECTION CS
&
COMPENSATION
Generator Min TOFF START
ZCD SET
Blanking of CS
during
Min TOFF, Min TON
&
ZCD Reset
&
&
OR
COMP
1k5
Min_TON
VDD
Trig/Disable
10 mA
MINIMUM ON
TIME
GENERATOR
Generator Min TON START
TIMER
100 ms
INV
One shoot
ZCD Reset
S
R
Q
Q
OR
VTH = 2 V
Trigger Blanking
150 ns
during DRV rising edge
& INV
One shoot
INV 150 ns
SQ
RQ
DRIVER
DRV Out
DRV
VDD
VCC
MANAGEMENT
UVLO
VCC
Sleep Mode
GND
Figure 3. Internal Circuit Architecture
http://onsemi.com
3
Free Datasheet http://www.datasheet4u.com/
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Номер в каталоге | Описание | Производители |
NCP4304A | Secondary Side Synchronous Rectification Driver | ON Semiconductor |
NCP4304B | Secondary Side Synchronous Rectification Driver | ON Semiconductor |
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