© Semiconductor Components Industries, LLC, 2015
March, 2015 − Rev. 3
1 Publication Order Number:
NCP1126/D
NCP1124, NCP1126,
NCP1129
High Voltage Switcher for
Offline Power Supplies
The NCP112x products integrates a fixed−frequency peak current
mode controller with a low on−resistance, 650 V MOSFET. Available
in a PDIP−7 package, the NCP112x offers a high level of integration,
including soft−start, frequency−jittering, short−circuit protection,
thermal shutdown protection, frequency foldback mode and
skip−cycle to reduce power consumption in light load condition, peak
current mode control with adjustable internal ramp compensation and
adjustable peak current set point.
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 no load condition.
Protection features include: a timer to detect an overload or a
short−circuit event with auto−recovery or latch protection, and a
built−in V
CC
overvoltage protection.
The switcher also provides a jittered 65 kHz or 100 kHz switching
frequency to improve the EMI.
Features
• Built−in 650 V, 1 A MOSFET with R
DS(on)
of 8.6 W for NCP1124
• Built−in 650 V, 1.8 A MOSFET with R
DS(on)
of 5.4 W for NCP1126
• Built−in 650 V, 5.5 A MOSFET with R
DS(on)
of 2.1 W for NCP1129
• Fixed−Frequency 65 or 100 kHz Current Mode Control with
Adjustable Internal Ramp Compensation
• Adjustable Current Limit with External Resistor
• Frequency Foldback Down to 26 kHz and Skip−Cycle for Light Load
Efficiency
• Frequency Jittering for EMI Improvement
• Less than 100 mW Standby Power @ High Line
• EPS 2.0 Compliant
• 7−Pin Package Provides Creepage Distance
• These are Pb−Free Devices
Table 1. OUTPUT POWER TABLE (Note 1)
Product
230 Vac + 15% (Note 4) 85 − 265 Vac
Adapter (Note 2) Peak or Open Frame (Note 3) Adapter (Note 2) Peak or Open Frame (Note 3)
NCP1124 12 W 27 W 6 W 14 W
NCP1126 15 W 32 W 10 W 17 W
NCP1129 28 W 43 W 20 W 26.5 W
1. 12 V output voltage with 135 V reflected output voltage
2. Typical continuous power in a non-ventilated enclosed adaptor measured at 50°C ambient temperature.
3. Maximum practical continuous power in an open-frame design at 50°C ambient temperature
4. 230 V
AC
or 115 V
AC
with voltage doubler.
PDIP−7
P SUFFIX
CASE 626B
MARKING DIAGRAMS
www.
onsemi.com
See detailed ordering and shipping information on page 17 o
this data sheet.
ORDERING INFORMATION
112xyPzzz
AWL
YYWWG
1
x = Specific Device Code
4 = NCP1124
6 = NCP1126
9 = NCP1129
y = A or B
A = Latch
B = Auto−recovery
zzz = Frequency
65 = 65 kHz
100 = 100 kHz
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
