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ON Semiconductor - High-Voltage Current-Mode PWM Controller Featuring Peak Power Excursion and Self-Relaxing Off Mode

Numéro de référence NCP1249C
Description High-Voltage Current-Mode PWM Controller Featuring Peak Power Excursion and Self-Relaxing Off Mode
Fabricant ON Semiconductor 
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NCP1249C fiche technique
NCP1249C, NCP1249D
High-Voltage Current­Mode
PWM Controller Featuring
Peak Power Excursion and
Self-Relaxing Off Mode
The NCP1249 is a highly integrated highvoltage PWM controller
http://onsemi.com
capable of delivering a rugged and high performance offline power
supply with extremely low noload consumption. With a supply range
MARKING DIAGRAM
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
the peak current setpoint.
To help build rugged converters, the controller features several key
9
1
SOIC9 NB
D SUFFIX
CASE 751BP
9
NCP1249x65
ALYW
G
1
protective features: a internal brownout, a nondissipative 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
power excursion when the peak current hits the limit. At this point, the
XXXXX = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbFree Package
switching frequency is increased from 65 kHz to 130 kHz until the
PIN CONNECTIONS
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).
Features
HighVoltage Current Source for Lossless Startup Sequence
X2
FB/REM
OPP/Latch
Timer
1
(Top View)
HV
VCC
DRV
GND
Automatic and Lossless X2 Capacitors Discharge Function
65 kHz FixedFrequency CurrentMode Control Operation with
130 kHz Excursion
Internal and Adjustable Over Power Protection (OPP)
Up to 30 V VCC Maximum Rating
Circuit
Internal BrownOut Protection Circuit
+300 mA/ 500 mA Source/Sink Drive Capability
Extremely Low NoLoad Standby Power via
Frequency Foldback Down to 26 kHz and SkipCycle
Controlled SelfRelaxing Off Mode
in Light Load Conditions
Adjustable Ramp Compensation
Option for AutoRecovery or Latched ShortCircuit
Protection
Internally Fixed 4 ms SoftStart
Internal Thermal Shutdown with Hysteresis
Adjustable Timer-Based AutoRecovery
These are PbFree Devices
Overload/ShortCircuit Protection
100% to 25% Timer Reduction from Overload to
ShortCircuit Fault
Frequency Jittering in Normal and Frequency Foldback
Modes
Typical Applications
Converters Requiring Peakpower Capability such as
Printers Power Supplies, acdc Adapters for Game
Stations
Latched OVP Input for Improved Robustness and
Latched OVP on VCC
ORDERING INFORMATION
See detailed ordering and shipping information on page 2 of
this data sheet.
© Semiconductor Components Industries, LLC, 2013
September, 2013 Rev. 0
1
Publication Order Number:
NCP1249C/D

PagesPages 30
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