DatasheetQ Logo
Electronic component search and free download site. Transistors,MosFET ,Diode,Integrated circuits

NCP1246-D Просмотр технического описания (PDF) - ON Semiconductor

Номер в каталоге
Компоненты Описание
производитель
NCP1246-D Datasheet PDF : 39 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
NCP1246
Fixed Frequency Current
Mode Controller for Flyback
Converters
The NCP1246 is a new fixedfrequency currentmode controller
http://onsemi.com
featuring the Dynamic SelfSupply. This function greatly simplifies
the design of the auxiliary supply and the VCC capacitor by activating
the internal startup current source to supply the controller during
startup, transients, latch, standby etc. This device contains a special
HV detector which detect the application unplug from the AC input
line and triggers the X2 discharge current. This HV structure allows
the brownout detection as well.
It features a timerbased fault detection that ensures the detection of
SOIC7
CASE 751U
MARKING
DIAGRAM
8
46Xff
ALYWX
G
1
overload and an adjustable compensation to help keep the maximum
power independent of the input voltage.
Due to frequency foldback, the controller exhibits excellent
efficiency in light load condition while still achieving very low
standby power consumption. Internal frequency jittering, ramp
compensation, and a versatile latch input make this controller an
excellent candidate for the robust power supply designs.
A dedicated Off mode allows to reach the extremely low no load
46Xff = Specific Device Code
X = A or B
ff = 65 or 100
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G
= PbFree Package
input power consumption via “sleeping” whole device and thus
minimize the power consumption of the control circuitry.
Features
FixedFrequency CurrentMode Operation (65 kHz and 100 kHz
frequency options)
PIN CONNECTIONS
Latch 1
FB 2
CS 3
8 HV
6 VCC
Frequency Foldback then Skip Mode for Maximized Performance in
GND 4
5 DRV
Light Load and Standby Conditions
TimerBased Overload Protection with Latched (Option A) or
(Top View)
AutoRecovery (Option B) Operation
Highvoltage Current Source with BrownOut Detection and
Dynamic SelfSupply, Simplifying the Design of the VCC Circuitry
Frequency Modulation for Softened EMI Signature
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 38 of this data sheet.
Adjustable Overpower Protection Dependant on the Bulk Voltage
Latchoff Input Combined with the Overpower Protection Sensing
Input
VCC Operation up to 28 V, With Overvoltage Detection
500/800 mA Source/Sink Drive Peak Current
Capability
10 ms SoftStart
Internal Thermal Shutdown
NoLoad Standby Power < 30 mW
X2 Capacitor in EMI Filter Discharging Feature
These Devices are PbFree and Halogen Free/BFR Free
Typical Applications
ACDC Adapters for Notebooks, LCD, and Printers
Offline Battery Chargers
Consumer Electronic Power Supplies
Auxiliary/Housekeeping Power Supplies
Offline Adapters for Notebooks
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, 2012
1
October, 2012 Rev. 1
Publication Order Number:
NCP1246/D

Share Link: 

datasheetq.com  [ Privacy Policy ]Request Datasheet ] [ Contact Us ]