DataSheet.es    


PDF NCP3231A Data sheet ( Hoja de datos )

Número de pieza NCP3231A
Descripción High Current Synchronous Buck Converter
Fabricantes ON Semiconductor 
Logotipo ON Semiconductor Logotipo



Hay una vista previa y un enlace de descarga de NCP3231A (archivo pdf) en la parte inferior de esta página.


Total 14 Páginas

No Preview Available ! NCP3231A Hoja de datos, Descripción, Manual

NCP3231A
High Current Synchronous
Buck Converter
The NCP3231A is a high current, high efficiency, voltage−mode
synchronous buck converter which operates from 4.5 V to 18 V input
and generates output voltages down to 0.6 V at up to 25 A.
Features
Wide Input Voltage Range from 4.5 V to 18 V
0.6 V Internal Reference Voltage
500 kHz Switching Frequency
External Programmable Soft−start
Lossless Low−side FET Current Sensing
Output Over−voltage Protection and Under−voltage Protection
System Over−temperature Protection using a Thermistor or Sensor
Hiccup Mode Operation for All Faults
Pre−bias Start−up
Adjustable Output Voltage
Power Good Output
Internal Over−temperature Protection
This is a Pb−Free Device*
Typical Applications
Cellular Base Stations
ASIC, FPGA, DSP and CPU Core and I/O Supplies
Telecom and Network Equipment
Server and Storage System
www.onsemi.com
1 40
QFN40 6x6, 0.5P
CASE 485CM
MARKING
DIAGRAM
1
NCP3231A
AWLYYWWG
NCP3231A = Specific Device Code
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
VIN 11
VIN 12
VIN 13
VIN 14
VSWH 15
PGND 16
PGND 17
PGND 18
PGND 19
PGND 20
VIN
EP42
GND
EP41
VSWH
EP43
40 EN
39 VCC
38 VB
37 PGND
36 BST
35 VSW
34 VSWH
33 VSWH
32 VSWH
31 VSWH
(TOP VIEW)
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
ORDERING INFORMATION
Device
Package Shipping
NCP3231AMNTXG QFN40
2500 /
(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 Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2015
May, 2015 − Rev. 3
1
Publication Order Number:
NCP3231A/D

1 page




NCP3231A pdf
NCP3231A
ELECTRICAL CHARACTERISTICS
(−40°C < TJ < +125°C, VCC = 12 V, for min/max values unless otherwise noted, TJ = +25°C for typical values)
Parameter
Symbol
Test Conditions
Min Typ
Max Units
POWER SUPPLY
VIN/VCC Operation Voltage
VIN/VCC
4.5 18 V
VB UVLO Threshold (Rising)
4.1 4.2 4.3 V
VB UVLO Threshold (Falling)
3.4 3.66 3.8
V
VB Output Voltage
VB
VCC = 6 V, 0 IB 40 mA
4.9 5.15 5.45 V
VB Dropout Voltage
IB = 25 mA, VCC = 4.5 V
36 110 mV
VCC Quiescent Current
EN = H, COMP = H, no switching;
PG open; no switching
4.7 6.4 mA
Shutdown Supply Current
FEEDBACK VOLTAGE
NCP3231A; EN = 0; VCC = 18 V; PG open
NCP3231A; EN = 0; VCC = 4.5 V; PG open
100 140 mA
53 75 mA
FB Input Voltage
Feedback Input Bias Current
VFB
TJ = 25°C, 4.5 V VCC 18 V
597 600 603 mV
−40°C TJ 125°C; 4.5 V VCC 18 V 594 600 606
IFB VFB = 0.6 V
75 nA
ERROR AMPLIFIER
Open Loop DC Gain
Guaranteed by Design
60 85
dB
Open Loop Unity Gain Bandwidth
F0dB,EA
24 MHz
Open Loop Phase Margin
60 °
Slew Rate
COMP Clamp Voltage, High
COMP pin to GND = 10 pF
2.5 V/m
3.46 V
COMP Clamp Voltage, Low
465 mV
Output Source Current
VFB = 0 V
15
mA
Output Sink Current
CURRENT LIMIT
VFB = 1 V
20
mA
Low−side ISET Current Source
Low−side ISET Current Source
Temperature Coefficient
LS_ISET
TC_LS_I−
SET
Sourced from ISET pin, before SS,
TJ = 25°C
34
+0.31
mA
%/°C
Low−side OCP Switch−over
Threshold
Guaranteed by Design
600 mV
Low−side Fixed OCP Threshold
LS_OCPth
Guaranteed by Design
300 mV
Low−side Programmable OCP Range LS_OCPth
< 600 mV
LS OCP Blanking time
LS_Tblnk
Guaranteed by Design
150 ns
PWM
Maximum duty cycle
fsw = 500 kHz, VFB = 0 V
4.5 V < VCC < 18 V
92 %
Minimum duty cycle
VCOMP < PWM Ramp Offset Voltage
0
%
Minimum GH on−time
Guaranteed by Characterization
60 ns
PWM Ramp Amplitude
Guaranteed by Characterization
VCC/8.6 VCC/6.6 VCC/5.6 V
PWM Ramp Offset
Guaranteed by Characterization
0.64 V
OSCILLATOR
Oscillator Frequency Range
fsw
fsw = 500 kHz
4.5 V < VCC < 18 V
450 500 550 kHz
www.onsemi.com
5

5 Page





NCP3231A arduino
NCP3231A
OPERATION DESCRIPTION
Overview
The NCP3231A is a 500 kHz, high efficiency, high current
PWM synchronous buck converter. It operates with a single
supply voltage from 4.5 to 18 V and can provide output
current as high as 25 A. NCP3231A utilizes voltage mode
with voltage feed−forward control to respond instantly to
Vin changes and provide for easier compensation over the
supply range of the converter. The device also includes
pre−bias startup capability to allow monotonic startup in the
event of a pre−biased output condition.
Protection features include overcurrent protection (OCP),
output over and under voltage protection (OVP, UVP), and
power good. The enable function is highly programmable to
allow for adjustable startup voltages at higher input
voltages. There is also an adjustable soft−start, an over−
temperature/over−voltage comparator, and internal thermal
shutdown.
Reference Voltage
The NCP3231A incorporates an internal reference that
allows output voltages as low as 0.6 V. The tolerance of the
internal reference is guaranteed over the entire operating
temperature range of the controller. The reference voltage is
trimmed using a test configuration that accounts for error
amplifier offset and bias currents.
Oscillator Ramp
The ramp waveform is a saw tooth formed at the PWM
frequency with a peak−to−peak amplitude of VCC/6.6,
offset from GND by typically 0.64 V. The PWM duty cycle
is limited to a maximum of 92%, allowing the bootstrap
capacitor to charge during each cycle.
Error Amplifier
The error amplifier’s primary function is to regulate the
converter’s output voltage using a resistor divider connected
from the converter’s output to the FB pin of the controller,
as shown in the Applications Schematic. A type III
compensation network must be connected around the error
amplifier to stabilize the converter. It has a bandwidth of
greater than 24 MHz, with open loop gain of at least 60 dB.
Programmable Soft−Start
An external capacitor connected from the SS pin to
ground sets up the soft start period, which can limit the
start−up inrush current. The soft start period can be
programmed based on the Equation 1.
tSS
+
CSS
ISS
Vref
(eq. 1)
OCP is the only fault that is active during a soft−start.
Adaptive Non−Overlap Gate Driver
In a synchronous buck converter, a certain dead time is
required between the low side drive signal and high side
drive signal to avoid shoot through. During the dead time,
the body diode of the low side FET freewheels the current.
The body diode has much higher voltage drop than that of
the MOSFET, which reduces the efficiency significantly.
The longer the body diode conducts, the lower the
efficiency. NCP3231A implements adaptive dead time
control to minimize the dead time, as well as preventing
shoot through.
Precision Enable (EN)
The ENABLE block allows the output to be toggled on
and off and is a precision analog input.
When the EN voltage exceeds V_EN, the controller will
initiate the soft-start sequence as long as the input voltage
and sub-regulated voltage have exceeded their UVLO
thresholds. V_EN_hyst helps to reject noise and allow the
pin to be resistively coupled to the input voltage or
sequenced with other rails.
If the EN voltage is held below typically 0.8 V, the
NCP3231A enters a deep disable state where the internal
bias circuitry is off. As the voltage at EN continues to rise,
the Enable comparator and reference are active and provide
a more accurate EN threshold. The drivers are held off until
the rising voltage at EN crosses V_EN.
An internal 2 mA pullup automatically enables the device
when the EN pin is left floating.
INPUT SUPPLY / VCC
VDD
2 mA
EN
1.2 V
Enable
Logic
Figure 22. Enable Functional Block Diagram
Pre−bias Startup
In some applications the controller will be required to start
switching when its output capacitors are charged anywhere
from slightly above 0 V to just below the regulation voltage.
This situation occurs for a number of reasons: the
converter’s output capacitors may have residual charge on
them or the converter’s output may be held up by a low
current standby power supply. NCP3231A supports
pre−bias start up by holding off switching until the feedback
voltage and thus the output voltage rises above the set
regulated voltage. If the pre−bias voltage is higher than the
set regulated voltage, switching does not occur until the
output voltage drops back to the regulation point.
www.onsemi.com
11

11 Page







PáginasTotal 14 Páginas
PDF Descargar[ Datasheet NCP3231A.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
NCP3231High Current Synchronous Buck ConverterON Semiconductor
ON Semiconductor
NCP3231AHigh Current Synchronous Buck ConverterON Semiconductor
ON Semiconductor

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
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,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar