NCP1072 Datasheet, PDF (1/26 Pages) ON Semiconductor – High-Voltage Switcher for Low Power Offline SMPS

NCP1072, NCP1075
High-Voltage Switcher for
Low Power Offline SMPS
The NCP1072/NCP1075 products integrate a fixed frequency
current mode controller with a 700 V MOSFET. Available in a
PDIP−7 or SOT−223 package, the NCP1072/5 offer a high level of
integration, including soft−start, frequency−jittering, short−circuit
protection, skip−cycle, a maximum peak current set point, ramp
compensation, and a Dynamic Self−Supply (eliminating the need for
an auxiliary winding).
Unlike other monolithic solutions, the NCP1072/5 is quiet by
nature: during nominal load operation, the part switches at one of the
available frequencies (65, 100 or 130 kHz). When the output power
demand diminishes, the IC automatically enters frequency foldback
mode and provides excellent efficiency at light loads. When the power
demand reduces further, it enters into a skip mode to reduce the
standby consumption down to a no load condition.
Protection features include: a timer to detect an overload or a
short−circuit event, Overvoltage Protection with auto−recovery and
AC input line voltage detection.
For improved standby performance, the connection of an auxiliary
winding stops the DSS operation and helps to reduce input power
consumption below 50 mW at high line.
http://onsemi.com
MARKING
DIAGRAMS
SOT−223
ST SUFFIX
CASE 318E
AYW
107xyG
G
1
PDIP−7
P SUFFIX
CASE 626A
P107xPyyy
AWL
YYWWG
x
= Current Limit (2 or 5)
y
= Oscillator Frequency
=A (65 kHz), B (100 kHz), C (130 kHz)
yyy = 065, 100, 130
A
= Assembly Location
WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 24 of this data sheet.
Features
• Built−in 700 V MOSFET with R_DS(on) of 11 W
• Large Creepage Distance Between High−voltage Pins
• Current−Mode Fixed Frequency Operation – 65 / 100 /
130 kHz (NCP1072 130 kHz on demand only)
• Peak Current: NCP1072 with 250 mA and NCP1075
with 450 mA
• Fixed Ramp Compensation
• Skip−Cycle Operation at Low Peak Currents Only: No
Acoustic Noise!
• Dynamic Self−Supply: No Need for an Auxiliary
Winding
• Internal 1 ms Soft−Start
• Auto−Recovery Output Short Circuit Protection with
Timer−Based Detection
• Auto−Recovery Overvoltage Protection with Auxiliary
Winding Operation
• Frequency Jittering for Better EMI Signature, Including
Frequency Foldback Mode
• No Load Input Consumption < 50 mW
• Frequency Foldback to Improve Efficiency at Light
Load
• Internal Temperature Shutdown
• These are Pb−Free Devices
Typical Applications
• Auxiliary / Standby Isolated Power Supplies White
Goods / Smart Meter / E−Meter
© Semiconductor Components Industries, LLC, 2012
1
November, 2012 − Rev. 2
Publication Order Number:
NCP1072/D