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NCP1256 Datasheet, PDF (1/24 Pages) ON Semiconductor – Low Power Offline PWM Current Mode Controller | |||
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NCP1256
Low Power Offline PWM
Current Mode Controller
with Brown-Out Protection
The NCP1256 includes everything to build costâeffective switch
mode power supplies ranging from a few watts up to several tens of
watts. Housed in a tiny TSOPâ6 package, the part can be supplied up
to 30 V. It hosts a jittered 65 or 100âkHz switching circuitry operated
in peak current mode control. When the power in the secondary side
starts decreasing, the controller automatically folds back its switching
frequency down to a minimum level of 26 kHz. As the power further
goes down, the part enters skip cycle while freezing the peak current.
NCP1256 comes with several protection features such as a
timerâbased autoârecovery short circuit protection, lossless OPP, and
an easily adjustable Brown Out (BO) pin. Two inputs are provided to
latch off the part in a practical way, for instance with OVP and OTP
events. Several options exists to chose latch or autoârecovery for these
events.
Features
⢠Fixedâfrequency 65âkHz or 100âkHz Currentâmode Control
Operation
⢠Adjustable Over Power Protection (OPP) Circuit, Disabled at Low
Line
⢠Adjustable Brown Out Level
⢠Frequency Foldback down to 26 kHz and Skipâcycle in Light Load
Conditions
⢠Internallyâfixed Slope Compensation Ramp
⢠Internallyâfixed 4âms Softâstart
⢠70âms Timerâbased Autoârecovery Shortâcircuit Protection
⢠Frequency Jittering in Normal and Frequency Foldback Modes
⢠Double Hiccup Autoârecovery Shortâcircuit Protection
⢠Preâshort Ready for Latched OCP Option
⢠Latched/AutoâRecovery OVP Protection on Vcc
⢠Latched Inputs for Improved Robustness (OVP and OTP
implementations)
⢠AutoâRecovery ac Line OVP Protection (E Version)
⢠+500 mA/ â500 mA Source/Sink Drive Capability
⢠EPS 2.0 Compliant
⢠These are PbâFree Devices
Typical Applications
⢠Acâdc Adapters for Portable Devices, Computers, Tablets etc.
⢠Auxiliary Power Supplies
www.onsemi.com
1
TSOPâ6
CASE 318G
STYLE 13
MARKING DIAGRAM
6xxAYWG
G
1
6xx = Specific Device Code
x
= A, E or 2
A
= Assembly Location
Y
= Year
W
= Work Week
G
= PbâFree Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
GND 1
6 DRV
FB 2
BO 3
5 VCC
4 CS
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 23 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
1
December, 2015 â Rev. 3
Publication Order Number:
NCP1256/D
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