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  ON Semiconductor Electronic Components Datasheet  

NCP1249 Datasheet

High-Voltage Current-Mode PWM Controller

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NCP1249
High-Voltage Current-Mode
PWM Controller Featuring
Peak Power Excursion and
Extremely Low Stand-by
Power Consumption
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The NCP1249 is a highly integrated high−voltage PWM controller
capable of delivering a rugged and high performance offline power
supply with extremely low no−load consumption. With a supply range
up to 30 V, the controller hosts a jittered 65−kHz switching circuitry
operated in peak current mode control. When the power on the
secondary side starts to decrease, 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
9
1
SOIC−9 NB
D SUFFIX
CASE 751BP
MARKING DIAGRAM
9
NCP1249x65
ALYW
G
1
the peak current setpoint.
To help build rugged converters, the controller features several key
protective features: a internal brown−out, a non−dissipative Over
Power Protection for a constant maximum output current regardless of
the input voltage and two latched over voltage protection inputs −
either through a dedicated pin or via the VCC input.
The controller architecture is arranged to authorize a transient peak
NCP1249x65 = Specific Device Code
x = A, B, C, D
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
power excursion when the peak current hits the limit. At this point, the
switching frequency is increased from 65 kHz to 130 kHz until the
peak requirement disappears. The timer duration is then modulated as
the converter crosses a peak power excursion mode (long) or
undergoes a short circuit (short).
NCP1249 comes in both Active ON (A and B versions) and Active
OFF (C and D versions).
PIN CONNECTIONS
1
X2
HV
REM
FB
CS
OPP/LATCH
VCC
DRV
GND
NCP1249A/B (Top View)
Features
High−voltage Current Source for Lossless Start−up Sequence
Remote Input for Standby Operation Control
Automatic and Lossless X2 Capacitors Discharge Function
65−kHz Fixed−frequency Current−mode Control Operation with
1
X2
HV
FB/REM
OPP/Latch
Timer
VCC
DRV
GND
NCP1249C/D (Top View)
130−kHz Excursion
Internal and Adjustable Over Power Protection (OPP)
+300 mA/ −500 mA Source/Sink Drive Capability
Circuit
Internal Brown−Out Protection Circuit
Frequency Foldback down to 26 kHz and Skip−cycle in
Light Load Conditions
Adjustable Ramp Compensation
Internally Fixed 4−ms Soft−start
100% to 25% Timer Reduction from Overload to
Short−circuit Fault
Frequency Jittering in Normal and Frequency Foldback
Modes
Latched OVP Input for Improved Robustness and
Latched OVP on Vcc
Up to 30 V Vcc Maximum Rating
Extremely Low No−load Standby Power
Option for Auto−Recovery or Latched Short−Circuit
Protection
Internal Thermal Shutdown with Hysteresis
These are Pb−Free Devices
Typical Applications
Converters Requiring Peak−power Capability such as
Printers Power Supplies, ac−dc Adapters for Game
Stations
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 3 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
May, 2015 − Rev. 2
1
Publication Order Number:
NCP1249/D


  ON Semiconductor Electronic Components Datasheet  

NCP1249 Datasheet

High-Voltage Current-Mode PWM Controller

No Preview Available !

NCP1249
Figure 1. Typical Application Example − NCP1249 (A/B)
Vbulk
L1
L2
.
.
OVP
.
OPP
L1 1 10
L2 2 9
38
47
56
NCP1249
ramp
comp.
Figure 2. Typical Application Example − NCP1249 (C/D)
Vout
www.onsemi.com
2


Part Number NCP1249
Description High-Voltage Current-Mode PWM Controller
Maker ON Semiconductor
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NCP1249 Datasheet PDF






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