© Semiconductor Components Industries, LLC, 2015
December, 2015 − Rev. 3
1 Publication Order Number:
NCP1256/D
NCP1256
Low Power Offline PWM
Current Mode Controller
with Brown-Out Protection
The NCP1256 includes everything to build cost−effective switch
mode power supplies ranging from a few watts up to several tens of
watts. Housed in a tiny TSOP−6 package, the part can be supplied up
to 30 V. It hosts a jittered 65 or 100−kHz 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
timer−based auto−recovery 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 auto−recovery for these
events.
Features
• Fixed−frequency 65−kHz or 100−kHz Current−mode Control
Operation
• Adjustable Over Power Protection (OPP) Circuit, Disabled at Low
Line
• Adjustable Brown Out Level
• Frequency Foldback down to 26 kHz and Skip−cycle in Light Load
Conditions
• Internally−fixed Slope Compensation Ramp
• Internally−fixed 4−ms Soft−start
• 70−ms Timer−based Auto−recovery Short−circuit Protection
• Frequency Jittering in Normal and Frequency Foldback Modes
• Double Hiccup Auto−recovery Short−circuit Protection
• Pre−short Ready for Latched OCP Option
• Latched/Auto−Recovery OVP Protection on V
cc
• Latched Inputs for Improved Robustness (OVP and OTP
implementations)
• Auto−Recovery ac Line OVP Protection (E Version)
• +500 mA/ −500 mA Source/Sink Drive Capability
• EPS 2.0 Compliant
• These are Pb−Free Devices
Typical Applications
• Ac−dc Adapters for Portable Devices, Computers, Tablets etc.
• Auxiliary Power Supplies
PIN CONNECTIONS
1
3
CS
GND
2
BO
4
DRV
6
(Top View)
5
V
CC
TSOP−6
CASE 318G
STYLE 13
MARKING DIAGRAM
FB
www.onsemi.com
(Note: Microdot may be in either location)
1
6xxAYWG
G
1
6xx = Specific Device Code
x = A, E or 2
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
See detailed ordering and shipping information in the package
dimensions section on page 23 of this data sheet.
ORDERING INFORMATION
