DataSheet.es    


PDF NCP4353 Data sheet ( Hoja de datos )

Número de pieza NCP4353
Descripción Secondary Side SMPS OFF Mode Controller
Fabricantes ON Semiconductor 
Logotipo ON Semiconductor Logotipo



Hay una vista previa y un enlace de descarga de NCP4353 (archivo pdf) en la parte inferior de esta página.


Total 17 Páginas

No Preview Available ! NCP4353 Hoja de datos, Descripción, Manual

NCP4353, NCP4354
Secondary Side SMPS OFF
Mode Controller for Low
Standby Power
The NCP4353/4 is a secondary side SMPS controller designed for
use in applications which require extremely low no load power
consumption. The device is capable of detecting “no load” conditions
and entering the power supply into a low consumption OFF mode.
During OFF mode, the primary side controller is turned off and energy
is provided by the output capacitors thus eliminating the power
consumption required to maintain regulation. During OFF mode, the
output voltage relaxes and is allowed to decrease to an adjustable
level. Once more energy is required, the NCP4353/4 automatically
restarts the primary side controller. The NCP4353/4 controls the
primary side controller with an “Active OFF” signal, meaning that it
drives optocoupler current during OFF mode to pull−down the FB pin
of the primary controller.
During normal power supply operation, the NCP4353/4 provides
integrated voltage feedback regulation, replacing the need for a shunt
regulator. The A versions include a current regulation loop in addition
to voltage regulation. Feedback control as well as ON/OFF signal can
be provided with only one optocoupler.
The NCP4354 includes a LED driver pin implemented with an open
drain MOSFET driven by a 1 kHz square wave with a 12.5% duty
cycle when primary side is in regulation for indication purpose.
The NCP4353 is available in TSOP−6 package while the NCP4354
is available in SOIC−8 package.
Features
Operating Input Voltage Range: 2.5 V to 36.0 V
Supply Current < 100 mA
±0.5% Reference Voltage Accuracy (TJ = 25°C)
Constant Voltage and Constant Current (A versions) Control Loop
Indication LED PWM Modulated Driver (NCP4354x)
Designed for use with NCP1246 Fixed Frequency PWM Controller
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
Offline Adapters for Notebooks, Game Stations and Printers
High Power AC−DC Converters for TVs, Set−Top Boxes, Monitors, etc.
www.onsemi.com
MARKING
DIAGRAMS
TSSOP−6
CASE 318G
XXXAYWG
G
11
8
1
SOIC−8
CASE 751
8
XXXXX
ALYW G
G
1
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering, marking and shipping information in the
package dimensions section on page 15 of this data sheet.
DEVICE OPTIONS
NCP4353A
Adjustable
Vmin
No
Current
Regulation
Yes
LED Driver
No
Package
TSOP−6
NCP4353B
Yes
No
No
TSOP−6
NCP4354A
Yes
Yes
Yes
SOIC−8
NCP4354B
Yes
No
Yes
SOIC−8
© Semiconductor Components Industries, LLC, 2015
April, 2015 − Rev. 4
1
Publication Order Number:
NCP4353/D

1 page




NCP4353 pdf
NCP4353, NCP4354
ELECTRICAL CHARACTERISTICS
0°C TJ 125°C; VCC = 15 V; unless otherwise noted. Typical values are at TJ = +25°C.
Parameter
Test Conditions
Symbol
Min
Typ
Max Unit
Maximum Operating Input Volt-
age
VCC 36.0 V
VCC UVLO
VCC UVLO Hysteresis
Quiescent Current in Regulation
Quiescent Current in OFF Mode
VOLTAGE CONTROL LOOP OTA
VCC rising
VCC falling
NCP4353A
NCP4353B
NCP4354A
NCP4354B
VSNS < 1.12 V
VCCUVLO
3.3
3.5
3.7
V
2.3 2.5 2.7
VCCUVLOHYS 0.8
1.0
V
ICC 101 125 mA
82 105
118 145
95 120
ICC,OFFmode
90 110 mA
Transconductance
Reference Voltage
Sink Current Capability
Inverting Input Bias Current
Inverting Input Bias Current
Threshold
Sink current only
2.8 V VCC 36.0 V, TJ = 25°C
2.8 V VCC 36.0 V, TJ = 0 − 85°C
2.8 V VCC 36.0 V, TJ = 0 − 125°C
In regulation, VDRIVE or VFBC > 1.5 V
In OFF mode, VDRIVE or VFBC > 1.5 V
In regulation, VSNS = VREF
In OFF mode, VSNS > 1.12 V
In OFF mode
gmV
VREF
ISINKV
IBIASV
VSNSBIASTH
1.244
1.240
1.230
2.5
1.2
−100
−13
1.07
1
1.250
1.250
1.250
1.5
−11
1.12
1.256
1.264
1.270
2.0
100
−10
1.17
S
V
mA
mA
nA
mA
V
CURRENT CONTROL LOOP OTA (NCP435xA only)
Transconductance
Sink current only
Reference Voltage
Sink Current Capability
VDRIVE or VFBC > 1.5 V
Inverting Input Bias Current
ISNS = VREFC
MINIMUM VOLTAGE COMPARATOR (except NCP4353A)
gmC
3S
VREFC
60 62.5 65 mV
ISINKC
2.5
mA
IBIASC
−100
100 nA
Threshold Voltage
VREFM 355 377 400 mV
Hysteresis
Output change from logic high to logic low
VMINH
40 mV
OFF MODE DETECTION COMPARATOR
Threshold Value
Hysteresis
LED DRIVER (NCP4354x only)
2.5 V VCC 36.0 V
VCC = 15 V
Output change from logic high to logic low
VOFFDETTH
VOFFDETH
10% VCC
1.47 1.50 1.53
40
V
mV
Switching Frequency
Duty Cycle
Switch Resistance
OFF MODE CONTROL
ILED = 5 mA
fSWLED
DLED
RSW2
10.0
1
12.5
50
kHz
15.0 %
W
Sink Current
In OFF mode, VDRIVE or VONOFF > 0.6 V
IDRIVEOFF
140
160
180
mA
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
www.onsemi.com
5

5 Page





NCP4353 arduino
NCP4353, NCP4354
is discharged through a fixed load, by R8 and R9 faster than
output voltage on C1.
Once OFFDET pin voltage is lower than VOFFDETTH (this
threshold is derived from VOUT), OFF mode is detected. In
OFF mode SW1 is switched on to allow IDRIVEOFF current,
going through ON/OFF pin (NCP4354B) or DRIVE pin, to
keep switch off primary controller.
A higher sink current on primary FB pin is needed to keep
primary controller FB below the skip level until the OFF
mode is detected on primary side.
Despite output voltage on C1 may go down, the current
IBIASV injected into VSNS pin provides the requested offset
(VSNS voltage is higher than VREF). Primary IC should
detect OFF mode before VSNS is lower than 90% of VREF
while IBIASV is switched off to reduce consumption.
This offset, defined by R7 and the internal current source,
should be large enough to secure off mode detection of the
primary controller and avoid restart when VSNS < VREF.
Minimum Output Voltage Detection (Except
NCP4353A)
Minimum output voltage level defines primary controller
restart from OFF mode. It can be set by shared voltage
divider with voltage regulation loop. When VMIN voltage
drops below VREFM, OFF mode is ended and primary
controller restarts.
Minimum voltage level is given by Equation 5 for divider
type 1
VMIN + VREF
R4 ) R5 ) R6
R6
(eq. 5)
and for type 2 by Equation 6.
VMIN + VREF
R4 ) R5 ) R6
R5 ) R6
(eq. 6)
NCP4353A has no external adjustment and uses the
internal minimum voltage level specified by minimum
falling operation supply voltage.
LED Driver (NCP4354x only)
LED driver is active when VCC is higher than VCCMIN
and output voltage is in regulation (driver is off in OFF
mode). LED driver consists of an internal power switch
controlled by a PWM modulated logic signal and an external
current limiting resistor R3. LED current can be computed
by Equation 7.
VOUT * VF_LED
ILED +
R3
(eq. 7)
PWM modulation is used to increase efficiency of LED.
Operation in OFF Mode Description
Operation waveforms in off mode and transition into OFF
mode with NCP1246 primary controller are shown in
Figure 31.
Figure shows waveforms from the first start (1) of the
convertor. At first, primary controller’s DSS charges VCC
capacitor over the UVLO level (2). When primary VCC is
over UVLO level (3), primary controller starts to operate.
VCC capacitor is charged above DSS level from auxiliary
winding, VOUT is slowly rising according to primary
controller start up ramp to nominal voltage (4).
Primary FB pin voltage is above regulation range until
VOUT is at set level. Once VOUT is at set level, the secondary
controller starts to sink current from optocoupler LED’s and
primary FB voltage is stabilized in regulation region. With
nominal output power (without skip mode) OFFDET pin
voltage is higher than VOFFDETTH (typically 10% of VCC).
After some time, the load current decreases to low level
(5) and primary convertor uses skip mode (6) to keep
regulation of output voltage at set level. The skip mode
consists of few switching cycles followed by missing ones
to provide limited energy by light load. The number of
missing cycles allows regulation for any output power.
While both C1 and C2 are discharged during the missing
cycles, C2 discharge will be faster than C1 without output
current, VOFFDET drops below VOFFDETTH and OFF mode
is detected (7). This situation is shown in Figure 30 in detail.
When OFF mode is detected, internal pull−up current
IBIASV is switch on (7), VSNS voltage increases (due to
IBIASV) and voltage amplifier sinks full current to keep
primary FB voltage below skip level until OFF mode is
detected by the primary side controller (8). Current into
ONOFF pin or DRIVE pin begins to flow at the same time,
when entering into OFF mode (7). When OFF mode is
detected by primary side controller (8a), primary FB
injected current decreases to a lower level to reduce overall
power consumption. Optocoupler current, can also be
reduced from that time to keep the level below restart level.
Secondary side controller decreases optocoupler current
(voltage transconductance amplifier stops to sink current)
when VSNS voltage drops below VREF (9) and IBIASV is
also switch off when VSNS is lower than 90% of VREF to
reduce overall consumption. This point is defined by IBIASV
current, R6, R4 and R5 resistors and discharging time of
output capacitor C1. Discharging of C1 continues (10) until
output voltage drops below level set by voltage divider at
VMIN pin (except NCP4353A where minimum VOUT is
defined only by VCC UVLO) (11). ONOFF current stops
and thanks to internal pull−up, the primary FB voltage rises
above restart level (12) and primary controller starts
switching (13). Output capacitor C1 is recharged (14) to set
voltage. If there is still light load condition primary
controller goes to skip mode (15) again and after some time
secondary controller detects OFF mode by very light or no
load condition (16) and whole cycle is repeated.
Fast Restart From OFF Mode
The IC ends OFF mode when a load is connected to the
output and VOUT is discharged to VMIN level. There exists
another connection that allows transition to normal mode
faster without waiting some time for VOUT to discharge to
VMIN. This schematic is shown at Figure 32. The basic idea
is that C3 is discharged by the IC faster than C1 by output
www.onsemi.com
11

11 Page







PáginasTotal 17 Páginas
PDF Descargar[ Datasheet NCP4353.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
NCP435(NCP434 / NCP435) 2A Ultra-Small Controlled Load SwitchON Semiconductor
ON Semiconductor
NCP4350Supervisory ICON Semiconductor
ON Semiconductor
NCP4353Secondary Side SMPS OFF Mode ControllerON Semiconductor
ON Semiconductor
NCP4353ASecondary Side SMPS OFF Mode ControllerON 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