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PDF NCV3011 Data sheet ( Hoja de datos )
| Número de pieza | NCV3011 | |
| Descripción | Synchronous PWM Controller | |
| Fabricantes | ON Semiconductor | |
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NCP3011, NCV3011
Synchronous PWM Controller
The NCP3011 is a PWM device designed to operate from a wide
input range and is capable of producing an output voltage as low as
0.8 V. The NCP3011 provides integrated gate drivers and an internally
set 400 kHz oscillator. The NCP3011 has an externally compensated
transconductance error amplifier with an internally fixed soft−start.
The NCP3011 incorporates output voltage monitoring with a Power
Good pin to indicate that the system is in regulation. The dual function
SYNC pin synchronizes the device to a higher frequency (Slave
Mode) or outputs a 180° out−of−phase clock signal to drive another
NCP3011 (Master Mode). Protection features include lossless current
limit and short circuit protection, output overvoltage and undervoltage
protection, and input undervoltage lockout. The NCP3011 is available
in a 14−pin TSSOP package.
Features
• Input Voltage Range from 4.7 V to 28 V
• 400 kHz Operation
• 0.8 V $1.0% Reference Voltage
• Buffered External +1.25 V Reference
• Current Limit and Short Circuit Protection
• Power Good
• Enable/Disable Pin
• Input Undervoltage Lockout
• External Synchronization
• Output Overvoltage and Undervoltage Protection
• NCV Prefix for Automotive and Other Applications Requiring Site
and Change Controls
• This is a Pb−Free Device
Typical Applications
• Set Top Box
• Power Modules
• ASIC / DSP Power Supply
VIN
CIN
EN
VCC BST
HSDR
CBST
PG VSW
VREF
SYNC
LSDR
R ISET
GND
Q1
LO
Q2 RFB1
RFB2
VOUT
CO
RREF
COMP FB
CREF
RC
CC2
C C1
Figure 1. Typical Application Circuit
http://onsemi.com
14
1
TSSOP−14
DT SUFFIX
CASE 948G
MARKING DIAGRAM
14
3011
ALYWG
G
1
3011= Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
VREF
EN
NC
SYNC
PG
COMP
FB
PIN CONNECTIONS
(TOP VIEW)
VCC
BST
HSDR
VSW
NC
LSDR
GND
ORDERING INFORMATION
Device
Package
Shipping†
NCP3011DTBR2G TSSOP−14 2500 / Tape & Reel
(Pb−Free)
NCV3011DTBR2G TSSOP−14 2500 / 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 Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2011
June, 2011 − Rev. 3
1
Publication Order Number:
NCP3011/D
1 page  
NCP3011, NCV3011
ELECTRICAL CHARACTERISTICS (−40°C < TJ < +125°C, VCC = 12 V, for min/max values unless otherwise noted)
Characteristic
Conditions
Min Typ Max
Input Voltage Range
− 4.7 28
SUPPLY CURRENT
Quiescent Supply Current
VCC Supply Current
VCC Supply Current
UNDER VOLTAGE LOCKOUT
EN = 0 VCC = 12 V
VFB = 0.75 V, Switching, VCC = 4.7 V
VFB = 0.75 V, Switching, VCC = 28 V
− 2.5 4.0
− 5.8 8.0
− 6.0 12
UVLO Rising Threshold
UVLO Falling Threshold
OSCILLATOR
VCC Rising Edge
VCC Falling Edge
3.8 4.3 4.7
3.6 4.0 4.3
Oscillator Frequency
Ramp−Amplitude Voltage
Ramp Valley Voltage
TJ = +25°C, 4.7 V v VCC v 28 V
350 400 450
TJ = −40°C to +125°C, 4.7 V v VCC v 28 V
330
400
470
Vpeak − Valley
− 1.5 −
0.44 0.7 0.96
PWM
Minimum Duty Cycle
−7−
Maximum Duty Cycle
80 83
−
Soft Start Ramp Time
EXTERNAL VOLTAGE REFERENCE
VFB = VCOMP
− 5.2 −
VREF Voltage
VREF Line Regulation
VREF Load Regulation
Short Circuit Output Current
ENABLE
IREF = 1 mA
VCC = 4.7 V − 28 V
IREF = 0 mA to 1.5 mA
VREF = 0 V
1.14 1.25 1.35
−1 − +1
−2 −0.2 +2
4.5 5.7 7.0
Enable Threshold High
− − 3.4
Enable Threshold Low
1.0 −
−
Enable Source Current
20 50 90
POWER GOOD
Power Good High Threshold
Power Good Low Threshold
Power Good Low Voltage
SYNC
VCC = 12 V
VCC = 12 V
VCC = 12 V, IPG = 4 mA
0.72 0.89 1.06
0.65 0.71 0.75
0.13 0.22 0.35
SYNC Input High Threshold
− − 2.0
SYNC Output High
SYNC Output Low
10 mA load
− 5.0 −
− 90 −
Phase Delay
(Note 4)
− 200 −
SYNC Drive Current (Sourcing)
− 1.6 −
Master Threshold Current
5.0 14.4 25
Master Frequency
390 466 550
4. Guaranteed by design.
5. The voltage sensed across the high side MOSFET during conduction.
6. This assumes 100 pF capacitance to ground on the COMP Pin and a typical internal Ro of > 10 MW.
7. This is not a protection feature.
Unit
V
mA
mA
mA
V
V
kHz
kHz
V
V
%
%
ms
V
%
%
mA
V
V
mA
V
V
V
V
V
mV
°
mA
mA
kHz
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5
5 Page 
NCP3011, NCV3011
DETAILED DESCRIPTION
OVERVIEW
The NCP3011 operates as a 400 kHz, voltage−mode,
pulse−width−modulated, (PWM) synchronous buck
converter. It drives high−side and low−side N−channel
power MOSFETs. The NCP3011 incorporates an internal
boost circuit consisting of a boost Clamp and boost diode to
provide supply voltage for the high side MOSFET Gate
driver. The NCP3011 also integrates several protection
features including input undervoltage lockout (UVLO),
output undervoltage (OUV), output overvoltage (OOV),
adjustable high−side current limit (ISET and ILIM), and
thermal shutdown (TSD). The NCP3011 includes a
Power Good (PG) open drain output which flags out of
regulation conditions.
The operational transconductance amplifier (OTA)
provides a high gain error signal which is compared to the
internal ramp signal using the PWM comparator. This
results in a voltage mode PWM feedback stage. The PWM
signal is sent to the internal gate drivers to modulate
MOSFET on and off times. The gate driver stage
incorporates symmetrical fixed non−overlap time between
the high−side and low−side MOSFET gate drives.
The NCP3011 has a dual function Master/Slave SYNC
pin In Slave mode, the NCP3011 synchronizes to an external
clock signal. In Master mode, the NCP3011 can output a
phase shifted clock signal to drive another master slave
equipped power stage to provide a 180° switching
relationship between the power stages. This can help to
reduce the required input filter capacitance in multi−stage
power converters.
The external 1.25 V reference voltage (VREF) is
provided for system level use. It remains active even when
the NCP3011 is disabled.
POR and UVLO
The device contains an internal Power On Reset (POR)
and input Undervoltage Lockout (UVLO) that inhibits the
internal logic and the output stage from operating until VCC
reaches their respective predefined voltage levels. The
internal logic takes approximately 50 ms to check the SYNC
pin and determine if the device is in Master mode or Slave
mode once the voltage at VCC exceeds the rising UVLO
threshold. The device remains in Standby if enable is not
asserted following the 50 ms time period.
Enable/Disable
The device has an enable pin (EN) with internal 50 mA
pullup current. This gives the user the option of driving EN
with a push−pull or open−drain/collector enable signal.
When driving EN with an external logic supply a 10 kW
series current limiting resistor must be placed in series with
EN. See Figure 27. The maximum enable threshold is 3.4 V.
If no external drive voltage is available, the internal pullup
can be used to enable the device, and an open drain/collector
input, such as a MOSFET or BJT can be used to disable the
device. A capacitor connected between EN and ground can
be used with the internal pullup current source to provide a
fixed delay to turn−on and turn off. See Equation 1.
DISABLE ENABLE
VEN
10 kW
− or−
ENABLE DISABLE
− or −
ENABLE DISABLE
EN
Enable
Logic
Figure 27. Enable Circuits: Push−Pull, Open−Drain,
or Open−Collector
CEN_DLY
+
IPU
TEN_DLY
VEN_TH
CEN_DLY = Delay Capacitance (F)
IPU = Pullup Current
VEN_TH = Enable Input High Threshold Voltage
TEN_DLY = Desired Delay Time
(eq. 1)
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11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet NCV3011.PDF ] | |
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