|
|
PDF NCP3418B Data sheet ( Hoja de datos )
| Número de pieza | NCP3418B | |
| Descripción | MOSFET Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de NCP3418B (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
NCP3418B
MOSFET Driver with Dual
Outputs for Synchronous
Buck Converters
The NCP3418B is a single Phase 12 V MOSFET gate driver
optimized to drive the gates of both high−side and low−side power
MOSFETs in a synchronous buck converter. The high−side and
low−side driver is capable of driving a 3000 pF load with a 25 ns
propagation delay and a 20 ns transition time.
With a wide operating voltage range, high or low side MOSFET
gate drive voltage can be optimized for the best efficiency. Internal
adaptive nonoverlap circuitry further reduces switching losses by
preventing simultaneous conduction of both MOSFETs.
The floating top driver design can accommodate VBST voltages as
high as 30 V, with transient voltages as high as 35 V. Both gate outputs
can be driven low by applying a low logic level to the Output Disable
(OD) pin. An Undervoltage Lockout function ensures that both driver
outputs are low when the supply voltage is low, and a Thermal
Shutdown function provides the IC with overtemperature protection.
The NCP3418B is pin−to−pin compatible with Analog Devices
ADP3418 with the following advantages:
Features
• Faster Rise and Fall Times
• Thermal Shutdown for System Protection
• Internal Pulldown Resistor Suppresses Transient Turn On of Either
MOSFET
• Anti Cross−Conduction Protection Circuitry
• Floating Top Driver Accommodates Boost Voltages of up to 30 V
• One Input Signal Controls Both the Upper and Lower Gate Outputs
• Output Disable Control Turns Off Both MOSFETs
• Complies with VRM10.x and VRM11.x Specifications
• Undervoltage Lockout
• Thermal Shutdown
• Thermally Enhanced Package Available
• These are Pb−Free Devices
8
1
http://onsemi.com
SO−8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
3418B
ALYW
G
1
DFN−10
MN SUFFIX
CASE 485C
3418B
ALYW
G
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
PIN CONNECTIONS
1
BST
IN
OD
VCC
8
DRVH
SWN
PGND
DRVL
1
BST
IN
OD
VCC
VCC
10
DRVH
SWN
PGND
PGND
DRVL
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NCP3418BDR2G SO−8 2500 Tape & Reel
(Pb−Free)
NCP3418BMNR2G DFN−10 3000 Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2006
March, 2006 − Rev. 5
1
Publication Order Number:
NCP3418B/D
1 page  
OD
DRVH
or
DRVL
NCP3418B
tpdlOD
90%
tpdhOD
10%
Figure 2. Output Disable Timing Diagram
IN
DRVL
DRVH−SW
SW
tpdlDRVL
tfDRVL
90%
2V
10%
tpdhDRVH
trDRVH
90%
10%
90%
tpdlDRVH
tfDRVH
90%
10%
trDRVL
2V 10%
tpdhDRVL
Figure 3. Nonoverlap Timing Diagram
APPLICATIONS INFORMATION
Theory of Operation
The NCP3418B is a single phase MOSFET driver designed
for driving two N−channel MOSFETs in a synchronous buck
converter topology. The NCP3418B will operate from 5 V or
12 V, but it has been optimized for high current multi−phase
buck regulators that convert 12 Volt rail directly to the core
voltage required by complex logic chips. A single PWM input
signal is all that is required to properly drive the high−side and
the low−side MOSFETs. Each driver is capable of driving a
3.3 nF load at frequencies up to 500 kHz.
Low−Side Driver
The low−side driver is designed to drive a
ground−referenced low RDS(on) N−Channel MOSFET. The
voltage rail for the low−side driver is internally connected to
the VCC supply and PGND.
High−Side Driver
The high−side driver is designed to drive a floating low
RDS(on) N−channel MOSFET. The gate voltage for the high
side driver is developed by a bootstrap circuit referenced to
Switch Node (SW) pin.
The bootstrap circuit is comprised of an external diode,
and an external bootstrap capacitor. When the NCP3418B is
starting up, the SW pin is at ground, so the bootstrap
capacitor will charge up to VCC through the bootstrap diode
See Figure 4. When the PWM input goes high, the high−side
driver will begin to turn on the high−side MOSFET using the
stored charge of the bootstrap capacitor. As the high−side
MOSFET turns on, the SW pin will rise. When the high−side
MOSFET is fully on, the switch node will be at 12 volts, and
the BST pin will be at 12 volts plus the charge of the
bootstrap capacitor (approaching 24 volts).
The bootstrap capacitor is recharged when the switch
node goes low during the next cycle.
http://onsemi.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet NCP3418B.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| NCP3418 | Dual Bootstrapped 12 V MOSFET Driver | ON Semiconductor |
| NCP3418A | Dual Bootstrapped 12 V MOSFET Driver | ON Semiconductor |
| NCP3418B | MOSFET Driver | ON Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |