© Semiconductor Components Industries, LLC, 2017
February, 2017 − Rev. 0
1 Publication Order Number:
NCP1076A/D
NCP1075A/B, NCP1076A/B,
NCP1077A/B, NCP1079A/B
Enhanced Off-line Switcher
for Robust and Highly
Efficient Power Supplies
The NCP107xu products integrate a fixed frequency current mode
controller with a 700 V MOSFET. Available in a two different pin−out
of the very common PDIP−7 package, the NCP107xu offers 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 (DSS,
eliminating the need for an auxiliary winding).
Unlike other monolithic solutions, the NCP107xu is quiet by nature:
during nominal load operation, the part switches at one of the available
frequencies (65 or 100 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, Over−voltage Protection with auto−recovery. Ac
input line voltage detection prevents lethal runaway in low input
voltage conditions (Brown−out) as well as too high an input line (Ac
line Over−voltage Protection). This also allows an Over−power
Protection to compensate all internal delays in high input voltage
conditions and optimize the maximum output current capability.
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.
Features
• Built−in 700 V MOSFET with R
DS(ON)
of 13.5 W
(NCP1075u), 4.8 W (NCP1076u/77u) and 2.9 W
(NCP1079u)
• Large Creepage Distance Between High Voltage Pins
• Current−mode Fixed Frequency Operation –
65 / 100 kHz
• Various Options for Maximum Peak Current: see below
table
• Fixed Slope Compensation
• Skip−cycle Operation at Low Peak Currents Only
• Dynamic Self−supply: No Need for an Auxiliary
Winding
• Internal 10 ms Soft−start
• Auto−recovery Output Short−circuit Protection with
Timer−based Detection
• Auto−recovery Over−voltage Protection with Auxiliary
Winding Operation
• Adjustable Brown−out Protection and OVP
• 2
nd
Leading Edge Blanking – Current Protection
• Over Power Protection
• Frequency Jittering for Better EMI Signature
• No Load Input Consumption < 50 mW
• Frequency Foldback to Improve Efficiency at Light
Load
• These are Pb−free Devices
Typical Applications
• Auxiliary / Standby Isolated Power Supplies
• Major Home Appliances Power Supplies
• Power Meter SMPS
• Wide Input Industrial SMPS
PDIP−7
(PDIP−8 LESS PIN 6)
CASE 626A
MARKING
DIAGRAMS
www.onsemi.com
x = Power Version (5, 6, 7, 9)
u = Pin Connections (A, B)
z = Internal Options (upon demand)
y = Oscillator Frequency 65, 100 (A, B)
A = Assembly Location
WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G = Pb−Free Package
See detailed ordering and shipping information on page 30 o
this data sheet.
ORDERING INFORMATION
P107xPuzy
AWL
YYWWG
PDIP−7
(PDIP−8 LESS PIN 3)
CASE 626AS
P107xPuzy
AWL
YYWWG
