Product Overview

Product Overview
NCP1244: Controller, Fixed Frequency, Current Mode, for Flyback Converters
For complete documentation, see the data sheet
Product Description
The NCP1244 is a new fixed-frequency current-mode controller featuring Dynamic Self-Supply. 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
start-up, transients, latch, stand-by etc. This device contains a special HV dtector which detects the application unplug from the AC
input line and triggers the X2 discharge current.
It features a timer-based 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 achieveing 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
minimze the power consumption of the control circuitry.
This product is IEC60950 compliant. Please see the test report and certification in the Conformance report section below.
Features
Benefits
• Frequency Foldback and Skip Mode
• Timer-Based Overload Protection with Latched (Option A) or
Auto-Recovery (Option B) operation
• High voltage current source with Dynamic Self Supply (DSS)
• Internal Frequency Jittering
• Adjustable overpower protection
• Dedicated latch off input
• Integrated X2 capacitor discharge
• Power saving off mode when used with NCP4353 or
NCP4354
• Maximizes efficiency in light load and standby conditions
• Protection against overcurrent or short circuit conditions
•
•
•
•
Provides fast, loss-less startup
Softer EMI signature
Compensates peak current for changing line input voltage
Simplifies protection for fault conditions like overtemperature
or overvoltage
• Eliminates the X2 capacitor discharge resistors and their
associated parasitic consumption
• Allows the power supply to achieve extremely low no load
power consumption
Part Electrical Specifications
Product
Compliance
Status
Topolog
y
Control
Mode
fsw Typ
(kHz)
StandUVLO
by Mode (V)
Short
Circuit
Protecti
on
Latch
Soft
Start
VCC Max Drive
(V)
Cap.
(mA)
Packag
e Type
NCP1244AD065R2G
Pb-free
Active
Flyback
Current
Mode
65
Yes
8.9
Yes
Yes
Yes
28
500 /
800
SOIC-7
Active
Flyback
Current
Mode
100
Yes
8.9
Yes
Yes
Yes
28
500 /
800
SOIC-7
Active
Flyback
Current
Mode
65
Yes
8.9
Yes
Yes
Yes
28
500 /
800
SOIC-7
Active
Flyback
Current
Mode
100
Yes
8.9
Yes
Yes
Yes
28
500 /
800
SOIC-7
Halide free
NCP1244AD100R2G
Pb-free
Halide free
NCP1244BD065R2G
Pb-free
Halide free
NCP1244BD100R2G
Pb-free
Halide free
Application Diagram
For more information please contact your local sales support at www.onsemi.com
Created on: 6/30/2016