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PDF NCP4308 Data sheet ( Hoja de datos )
| Número de pieza | NCP4308 | |
| Descripción | Synchronous Rectifier Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCP4308
Product Preview
Synchronous Rectifier
Controller
The NCP4308 is a synchronous rectifier controller for switch mode
power supplies. The controller enables high efficiency designs for
flyback, quasi resonant flyback and LLC topologies.
Externally adjustable minimum off−time and on−time blanking
periods provides flexibility to drive various MOSFET package types
and PCB layout. A reliable and noise less operation of the SR system is
insured due to the Self Synchronization feature. The NCP4308 also
utilizes Kelvin connection of the driver to the MOSFET to achieve high
efficiency operation at full 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. The high
accuracy driver and 5 V gate clamp make it ideally suited for directly
driving GaN devices.
Features
• Self−Contained Control of Synchronous Rectifier in CCM, DCM and
QR for Flyback or LLC Applications
• Precise True Secondary Zero Current Detection
• Rugged Current Sense Pin (up to 150 V)
• Adjustable Minimum ON−Time
• Adjustable Minimum OFF-Time with Ringing Detection
• Adjustable Maximum ON−Time for CCM Controlling of Primary
QR Controller
• Improved Robust Self Synchronization Capability
• 8 A / 4 A Peak Current Sink / Source Drive Capability
• Operating Voltage Range up to VCC = 35 V
• GaN Transistor Driving Capability (options A and C)
• Low Startup Current Consumption
• Maximum Operation Frequency up to 1 MHz
• SOIC-8 and DFN−8 (4x4) and WDFN8 (2x2) Packages
• These are Pb−Free Devices
Typical Applications
• Notebook Adapters
• High Power Density AC/DC Power Supplies (Cell Phone Chargers)
• LCD TVs
• All SMPS with High Efficiency Requirements
www.onsemi.com
8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
NCP4308x
ALYW G
G
1
1
DFN8
MN SUFFIX
CASE 488AF
4308x
ALYWG
G
WDFN8
MT SUFFIX
CASE 511AT
1
ExMG
G
4308x
Ex
A
L
Y
W
M
G
= Specific Device Code
x = A, B, C, D or Q
= Specific Device Code
x = A, 2, C, D or Q
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Date Code
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information on page 26 of
this data sheet.
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2015
September, 2015 − Rev. P0
1
Publication Order Number:
NCP4308/D
1 page  
NCP4308
MIN_TON
CS
ELAPSED
ADJ Minimum ON time
generator
EN
VDD
100mA
CS_ON
CS
detection
CS_OFF
CS_RESET
MIN_TOFF
RESET
ADJ Minimum OFF ELAPSED
time generator EN
MAX_TON
ELAPSED
ADJ Maximum ON time
generator
EN
NC
Control logic
DRIVER
DRV Out
DRV
VDD
VCC managment
UVLO
VCC
GND
Figure 6. Internal Circuit Architecture − NCP4308Q (CCM QR) with MAX_TON
www.onsemi.com
5
5 Page 
NCP4308
TYPICAL CHARACTERISTICS
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0
5 10 15 20 25 30
VCC (V)
Figure 19. CS Reset Threshold
35
60
55
50
45
40
35
30
25
20
−40 −20 0 20 40 60 80 100 120
TJ (°C)
Figure 21. Propagation Delay from CS to DRV
Output On
200
180
160
140
120
TBD
100
80
60
40
20
0
−40 −20 0 20 40 60 80 100
TJ (°C)
Figure 20. CS Leakage, VCS = 150 V
120
24
22
20
18
16
14
12
10
8
6
4
−40 −20 0 20 40 60 80 100 120
TJ (°C)
Figure 22. Propagation Delay from CS to DRV
Output Off
75
70
65
60
55
50
45
40
35
−40 −20 0 20 40 60 80 100 120
TJ (°C)
Figure 23. Minimum On−time RMIN_TON = 0 W
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0.92
−40 −20 0 20 40 60 80 100 120
TJ (°C)
Figure 24. Minimum On−time RMIN_TON = 10 kW
www.onsemi.com
11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet NCP4308.PDF ] | |
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