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NCP1244 fiches techniques PDF

ON Semiconductor - Fixed Frequency Current Mode Controller

Numéro de référence NCP1244
Description Fixed Frequency Current Mode Controller
Fabricant ON Semiconductor 
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NCP1244 fiche technique
NCP1244
Fixed Frequency Current
Mode Controller for Flyback
Converters
The NCP1244 is a new fixedfrequency currentmode controller
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.
It features a timerbased fault detection that ensures the detection of
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
input power consumption via “sleeping” whole device and thus
minimize the power consumption of the control circuitry.
http://onsemi.com
MARKING
DIAGRAM
SOIC7
CASE 751U
8
44Xff
ALYWX
G
1
44Xff = 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
Features
PIN CONNECTIONS
FixedFrequency CurrentMode Operation (65 kHz and 100 kHz
frequency options)
Frequency Foldback then Skip Mode for Maximized Performance in
Light Load and Standby Conditions
TimerBased Overload Protection with Latched (Option A) or
Latch 1
FB 2
CS 3
GND 4
8 HV
6 VCC
5 DRV
AutoRecovery (Option B) Operation
(Top View)
Highvoltage Current Source with Dynamic SelfSupply,
Simplifying the Design of the VCC Circuitry
Frequency Modulation for Softened EMI Signature
Adjustable Overpower Protection Dependant on the Bulk Voltage
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 39 of this data sheet.
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
Typical Applications
ACDC Adapters for Notebooks, LCD, and Printers
Offline Battery Chargers
10 ms SoftStart
Consumer Electronic Power Supplies
Internal Thermal Shutdown
Auxiliary/Housekeeping Power Supplies
NoLoad Standby Power < 30 mW
Offline Adapters for Notebooks
X2 Capacitor in EMI Filter Discharging Feature
These Devices are PbFree and Halogen Free/BFR Free
© Semiconductor Components Industries, LLC, 2012
December, 2012 Rev. 0
1
Publication Order Number:
NCP1244/D
Free Datasheet http://www.datasheet4u.com/

PagesPages 30
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